Leetcode
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一、iPhone/iPad端安装
1、iTelevision （更好用的直播流播放器/手机电视） iTelevision群：https://t.me/iTelevisions
6、iNetwork iNetwork群：https://t.me/iNetworka
二、iMac、MacBook等安装：
Supports 15 programming languages, sorted alphabetically.
| Bash | C | C++ | C# | Go | Java | JavaScript | Kotlin |
| PHP | Python | Python3 | Ruby | Rust | Scala | Swift |
↓WeChat reward↓ & ↓Alipay reward↓ → Reward List | 山青咏芝
|No.|Swift && Title|C++|Python3|Kotlin|Difficulty|
| ------ | ------ | ------ | ------ | ------ | ------ |
| 1326 | Minimum Number of Taps to Open to Water a Garden | ✓ | ✓ | ✓ | Hard |
| 1325 | Delete Leaves With a Given Value | ✓ | ✓ | ✓ | Medium |
| 1324 | Print Words Vertically | ✓ | ✓ | ✓ | Medium |
| 1323 | Maximum 69 Number | ✓ | ✓ | ✓ | Easy |
| 1322 | | ✓ | ✓ | ✓ | Easy |
| 1321 | | ✓ | ✓ | ✓ | Medium |
| 1320 | Minimum Distance to Type a Word Using Two Fingers | ✓ | ✓ | ✓ | Hard |
| 1319 | Number of Operations to Make Network Connected | ✓ | ✓ | ✓ | Medium |
| 1318 | Minimum Flips to Make a OR b Equal to c | ✓ | ✓ | ✓ | Medium |
| 1317 | Convert Integer to the Sum of Two No-Zero Integers | ✓ | ✓ | ✓ | Easy |
| 1316 | Distinct Echo Substrings | ✓ | ✓ | ✓ | Hard |
| 1315 | Sum of Nodes with Even-Valued Grandparent | ✓ | ✓ | ✓ | Medium |
| 1314 | Matrix Block Sum | ✓ | ✓ | ✓ | Medium |
| 1313 | Decompress Run-Length Encoded List | ✓ | ✓ | ✓ | Easy |
| 1312 | Minimum Insertion Steps to Make a String Palindrome | ✓ | ✓ | ✓ | Hard |
| 1311 | Get Watched Videos by Your Friends | ✓ | ✓ | ✓ | Medium |
| 1310 | XOR Queries of a Subarray | ✓ | ✓ | ✓ | Medium |
| 1309 | Decrypt String from Alphabet to Integer Mapping | ✓ | ✓ | ✓ | Easy |
| 1308 | | ✓ | ✓ | ✓ | Medium |
| 1307 | Verbal Arithmetic Puzzle | ✓ | ✓ | ✓ | Hard |
| 1306 | Jump Game III | ✓ | ✓ | ✓ | Medium |
| 1305 | All Elements in Two Binary Search Trees | ✓ | ✓ | ✓ | Medium |
| 1304 | Find N Unique Integers Sum up to Zero | ✓ | ✓ | ✓ | Easy |
| 1303 | | ✓ | ✓ | ✓ | Easy |
| 1302 | Deepest Leaves Sum | ✓ | ✓ | ✓ | Medium |
| 1301 | Number of Paths with Max Score | ✓ | ✓ | ✓ | Hard |
| 1300 | Sum of Mutated Array Closest to Target | ✓ | ✓ | ✓ | Medium |
| 1299 | Replace Elements with Greatest Element on Right Side | ✓ | ✓ | ✓ | Easy |
| 1298 | Maximum Candies You Can Get from Boxes | ✓ | ✓ | ✓ | Hard |
| 1297 | Maximum Number of Occurrences of a Substring | ✓ | ✓ | ✓ | Medium |
| 1296 | Divide Array in Sets of K Consecutive Numbers | ✓ | ✓ | ✓ | Medium |
| 1295 | Find Numbers with Even Number of Digits | ✓ | ✓ | ✓ | Easy |
| 1294 | | ✓ | ✓ | ✓ | Easy |
| 1293 | Shortest Path in a Grid with Obstacles Elimination | ✓ | ✓ | ✓ | Hard |
| 1292 | Maximum Side Length of a Square with Sum Less than or Equal to Threshold | ✓ | ✓ | ✓ | Medium |
| 1291 | Sequential Digits | ✓ | ✓ | ✓ | Medium |
| 1290 | Convert Binary Number in a Linked List to Integer | ✓ | ✓ | ✓ | Easy |
| 1289 | Minimum Falling Path Sum II | ✓ | ✓ | ✓ | Hard |
| 1288 | Remove Covered Intervals | ✓ | ✓ | ✓ | Medium |
| 1287 | Element Appearing More Than 25% In Sorted Array | ✓ | ✓ | ✓ | Easy |
| 1286 | Iterator for Combination | ✓ | ✓ | ✓ | Medium |
| 1285 | | ✓ | ✓ | ✓ | Medium |
| 1284 | Minimum Number of Flips to Convert Binary Matrix to Zero Matrix | ✓ | ✓ | ✓ | Hard |
| 1283 | Find the Smallest Divisor Given a Threshold | ✓ | ✓ | ✓ | Medium |
| 1282 | Group the People Given the Group Size They Belong To | ✓ | ✓ | ✓ | Medium |
| 1281 | Subtract the Product and Sum of Digits of an Integer | ✓ | ✓ | ✓ | Easy |
| 1280 | | ✓ | ✓ | ✓ | Easy |
| 1279 | | ✓ | ✓ | ✓ | Easy |
| 1278 | Palindrome Partitioning III | ✓ | ✓ | ✓ | Hard |
| 1277 | Count Square Submatrices with All Ones | ✓ | ✓ | ✓ | Medium |
| 1276 | Number of Burgers with No Waste of Ingredients | ✓ | ✓ | ✓ | Medium |
| 1275 | Find Winner on a Tic Tac Toe Game | ✓ | ✓ | ✓ | Easy |
| 1274 | | ✓ | ✓ | ✓ | Hard |
| 1273 | | ✓ | ✓ | ✓ | Medium |
| 1272 | | ✓ | ✓ | ✓ | Medium |
| 1271 | | ✓ | ✓ | ✓ | Easy |
| 1270 | | ✓ | ✓ | ✓ | Medium |
| 1269 | Number of Ways to Stay in the Same Place After Some Steps | ✓ | ✓ | ✓ | Hard |
| 1268 | Search Suggestions System | ✓ | ✓ | ✓ | Medium |
| 1267 | Count Servers that Communicate | ✓ | ✓ | ✓ | Medium |
| 1266 | Minimum Time Visiting All Points | ✓ | ✓ | ✓ | Easy |
| 1265 | | ✓ | ✓ | ✓ | Medium |
| 1264 | | ✓ | ✓ | ✓ | Medium |
| 1263 | | ✓ | ✓ | ✓ | Hard |
| 1262 | | ✓ | ✓ | ✓ | Medium |
| 1261 | | ✓ | ✓ | ✓ | Medium |
| 1260 | | ✓ | ✓ | ✓ | Easy |
| 1259 | | ✓ | ✓ | ✓ | Hard |
| 1258 | | ✓ | ✓ | ✓ | Medium |
| 1257 | | ✓ | ✓ | ✓ | Medium |
| 1256 | | ✓ | ✓ | ✓ | Medium |
| 1255 | Maximum Score Words Formed by Letters | ✓ | ✓ | ✓ | Hard |
| 1254 | Number of Closed Islands | ✓ | ✓ | ✓ | Medium |
| 1253 | Reconstruct a 2-Row Binary Matrix | ✓ | ✓ | ✓ | Medium |
| 1252 | Cells with Odd Values in a Matrix | ✓ | ✓ | ✓ | Easy |
| 1251 | | ✓ | ✓ | ✓ | Easy |
| 1250 | Check If It Is a Good Array | ✓ | ✓ | ✓ | Hard |
| 1249 | Minimum Remove to Make Valid Parentheses | ✓ | ✓ | ✓ | Medium |
| 1248 | Count Number of Nice Subarrays | ✓ | ✓ | ✓ | Medium |
| 1247 | Minimum Swaps to Make Strings Equal | ✓ | ✓ | ✓ | Medium |
| 1246 | | ✓ | ✓ | ✓ | Hard |
| 1245 | | ✓ | ✓ | ✓ | Medium |
| 1244 | | ✓ | ✓ | ✓ | Medium |
| 1243 | | ✓ | ✓ | ✓ | Easy |
| 1242 | | ✓ | ✓ | ✓ | Medium |
| 1241 | | ✓ | ✓ | ✓ | Easy |
| 1240 | Tiling a Rectangle with the Fewest Squares | ✓ | ✓ | ✓ | Hard |
| 1239 | Maximum Length of a Concatenated String with Unique Characters | ✓ | ✓ | ✓ | Medium |
| 1238 | Circular Permutation in Binary Representation | ✓ | ✓ | ✓ | Medium |
| 1237 | Find Positive Integer Solution for a Given Equation | ✓ | ✓ | ✓ | Easy |
| 1236 | | ✓ | ✓ | ✓ | Medium |
| 1235 | Maximum Profit in Job Scheduling | ✓ | ✓ | ✓ | Hard |
| 1234 | Replace the Substring for Balanced String | ✓ | ✓ | ✓ | Medium |
| 1233 | Remove Sub-Folders from the Filesystem | ✓ | ✓ | ✓ | Medium |
| 1232 | Check If It Is a Straight Line | ✓ | ✓ | ✓ | Easy |
| 1231 | | ✓ | ✓ | ✓ | Hard |
| 1230 | | ✓ | ✓ | ✓ | Medium |
| 1229 | | ✓ | ✓ | ✓ | Medium |
| 1228 | | ✓ | ✓ | ✓ | Easy |
| 1227 | Airplane Seat Assignment Probability | ✓ | ✓ | ✓ | Medium |
| 1226 | The Dining Philosophers | ✓ | ✓ | ✓ | Medium |
| 1225 | Report Contiguous Dates | ✓ | ✓ | ✓ | Hard |
| 1224 | Maximum Equal Frequency | ✓ | ✓ | ✓ | Hard |
| 1223 | Dice Roll Simulation | ✓ | ✓ | ✓ | Medium |
| 1222 | Queens That Can Attack the King | ✓ | ✓ | ✓ | Medium |
| 1221 | Split a String in Balanced Strings | ✓ | ✓ | ✓ | Easy |
| 1220 | Count Vowels Permutation | ✓ | ✓ | ✓ | Hard |
| 1219 | Path with Maximum Gold | ✓ | ✓ | ✓ | Medium |
| 1218 | Longest Arithmetic Subsequence of Given Difference | ✓ | ✓ | ✓ | Medium |
| 1217 | Play with Chips | ✓ | ✓ | ✓ | Easy |
| 1216 | Valid Palindrome III | ✓ | ✓ | ✓ | Hard |
| 1215 | Stepping Numbers | ✓ | ✓ | ✓ | Medium |
| 1214 | Two Sum BSTs | ✓ | ✓ | ✓ | Medium |
| 1213 | Intersection of Three Sorted Arrays | ✓ | ✓ | ✓ | Easy |
| 1212 | | ✓ | ✓ | ✓ | Medium |
| 1211 | | ✓ | ✓ | ✓ | Easy |
| 1210 | Minimum Moves to Reach Target with Rotations | ✓ | ✓ | ✓ | Hard |
| 1209 | Remove All Adjacent Duplicates in String II | ✓ | ✓ | ✓ | Medium |
| 1208 | Get Equal Substrings Within Budget | ✓ | ✓ | ✓ | Medium |
| 1207 | Unique Number of Occurrences | ✓ | ✓ | ✓ | Easy |
| 1206 | | ✓ | ✓ | ✓ | Hard |
| 1205 | | ✓ | ✓ | ✓ | Medium |
| 1204 | | ✓ | ✓ | ✓ | Medium |
| 1203 | Sort Items by Groups Respecting Dependencies | ✓ | ✓ | ✓ | Hard |
| 1202 | Smallest String With Swaps | ✓ | ✓ | ✓ | Medium |
| 1201 | Ugly Number III | ✓ | ✓ | ✓ | Medium |
| 1200 | Minimum Absolute Difference | ✓ | ✓ | ✓ | Easy |
| 1199 | Minimum Time To Build Blocks | ✓ | ✓ | ✓ | Hard |
| 1198 | Find Smallest Common Element in All Rows | ✓ | ✓ | ✓ | Medium |
| 1197 | Minimum Knight Moves | ✓ | ✓ | ✓ | Medium |
| 1196 | How Many Apples Can You Put into the Basket | ✓ | ✓ | ✓ | Easy |
| 1195 | Fizz Buzz Multithreaded | ✓ | ✓ | ✓ | Medium |
| 1194 | | ✓ | ✓ | ✓ | Hard |
| 1193 | | ✓ | ✓ | ✓ | Medium |
| 1192 | Critical Connections in a Network | ✓ | ✓ | ✓ | Hard |
| 1191 | K-Concatenation Maximum Sum | ✓ | ✓ | ✓ | Medium |
| 1190 | Reverse Substrings Between Each Pair of Parentheses | ✓ | ✓ | ✓ | Medium |
| 1189 | Maximum Number of Balloons | ✓ | ✓ | ✓ | Easy |
| 1188 | | ✓ | ✓ | ✓ | Medium |
| 1187 | Make Array Strictly Increasing | ✓ | ✓ | ✓ | Hard |
| 1186 | Maximum Subarray Sum with One Deletion | ✓ | ✓ | ✓ | Medium |
| 1185 | Day of the Week | ✓ | ✓ | ✓ | Easy |
| 1184 | Distance Between Bus Stops | ✓ | ✓ | ✓ | Easy |
| 1183 | Maximum Number of Ones | ✓ | ✓ | ✓ | Hard |
| 1182 | Shortest Distance to Target Color | ✓ | ✓ | ✓ | Medium |
| 1181 | Before and After Puzzle | ✓ | ✓ | ✓ | Medium |
| 1180 | Count Substrings with Only One Distinct Letter | ✓ | ✓ | ✓ | Easy |
| 1179 | Reformat Department Table | ✓ | ✓ | ✓ | Easy |
| 1178 | Number of Valid Words for Each Puzzle | ✓ | ✓ | ✓ | Hard |
| 1177 | Can Make Palindrome from Substring | ✓ | ✓ | ✓ | Medium |
| 1176 | Diet Plan Performance | ✓ | ✓ | ✓ | Easy |
| 1175 | Prime Arrangements | ✓ | ✓ | ✓ | Easy |
| 1174 | | ✓ | ✓ | ✓ | Medium |
| 1173 | | ✓ | ✓ | ✓ | Easy |
| 1172 | Dinner Plate Stacks | ✓ | ✓ | ✓ | Hard |
| 1171 | Remove Zero Sum Consecutive Nodes from Linked List | ✓ | ✓ | ✓ | Medium |
| 1170 | Compare Strings by Frequency of the Smallest Character | ✓ | ✓ | ✓ | Easy |
| 1169 | Invalid Transactions | ✓ | ✓ | ✓ | Easy |
| 1168 | Optimize Water Distribution in a Village | ✓ | ✓ | ✓ | Hard |
| 1167 | Minimum Cost to Connect Sticks | ✓ | ✓ | ✓ | Medium |
| 1166 | Design File System | ✓ | ✓ | ✓ | Medium |
| 1165 | Single-Row Keyboard | ✓ | ✓ | ✓ | Easy |
| 1164 | | ✓ | ✓ | ✓ | Medium |
| 1163 | Last Substring in Lexicographical Order | ✓ | ✓ | ✓ | Hard |
| 1162 | As Far from Land as Possible | ✓ | ✓ | ✓ | Medium |
| 1161 | Maximum Level Sum of a Binary Tree | ✓ | ✓ | ✓ | Medium |
| 1160 | Find Words That Can Be Formed by Characters | ✓ | ✓ | ✓ | Easy |
| 1159 | | ✓ | ✓ | ✓ | Hard |
| 1158 | | ✓ | ✓ | ✓ | Medium |
| 1157 | Online Majority Element In Subarray | ✓ | ✓ | ✓ | Hard |
| 1156 | Swap For Maximum Repeated Substring | ✓ | ✓ | ✓ | Medium |
| 1155 | Number of Dice Rolls With Target Sum | ✓ | ✓ | ✓ | Medium |
| 1154 | Ordinal Number Of Date | ✓ | ✓ | ✓ | Easy |
| 1153 | String Transforms Into Another String | ✓ | ✓ | ✓ | Hard |
| 1152 | Analyze User Website Visit Pattern | ✓ | ✓ | ✓ | Medium |
| 1151 | Minimum Swaps to Group All 1's Together | ✓ | ✓ | ✓ | Medium |
| 1150 | Check If a Number Is Majority Element in a Sorted Array | ✓ | ✓ | ✓ | Easy |
| 1149 | | ✓ | ✓ | ✓ | Medium |
| 1148 | | ✓ | ✓ | ✓ | Easy |
| 1147 | Longest Chunked Palindrome Decomposition | ✓ | ✓ | ✓ | Hard |
| 1146 | Snapshot Array | ✓ | ✓ | ✓ | Medium |
| 1145 | Binary Tree Coloring Game | ✓ | ✓ | ✓ | Hard |
| 1144 | Decrease Elements To Make Array Zigzag | ✓ | ✓ | ✓ | Easy |
| 1143 | Longest Common Subsequence | ✓ | ✓ | ✓ | Easy |
| 1142 | | ✓ | ✓ | ✓ | Medium |
| 1141 | | ✓ | ✓ | ✓ | Medium |
| 1140 | Stone Game II | ✓ | ✓ | ✓ | Medium |
| 1139 | Largest 1-Bordered Square | ✓ | ✓ | ✓ | Medium |
| 1138 | Alphabet Board Path | ✓ | ✓ | ✓ | Medium |
| 1137 | N-th Tribonacci Number | ✓ | ✓ | ✓ | Easy |
| 1136 | Parallel Courses | ✓ | ✓ | ✓ | Hard |
| 1135 | Connecting Cities With Minimum Cost | ✓ | ✓ | ✓ | Medium |
| 1134 | Armstrong Number | ✓ | ✓ | ✓ | Hard |
| 1133 | Largest Unique Number | ✓ | ✓ | ✓ | Easy |
| 1132 | | ✓ | ✓ | ✓ | Easy |
| 1131 | Maximum of Absolute Value Expression | ✓ | ✓ | ✓ | Medium |
| 1130 | Minimum Cost Tree From Leaf Values | ✓ | ✓ | ✓ | Medium |
| 1129 | Shortest Path with Alternating Colors | ✓ | ✓ | ✓ | Medium |
| 1128 | Number of Equivalent Domino Pairs | ✓ | ✓ | ✓ | Easy |
| 1127 | | ✓ | ✓ | ✓ | Hard |
| 1126 | | ✓ | ✓ | ✓ | Medium |
| 1125 | Smallest Sufficient Team | ✓ | ✓ | ✓ | Hard |
| 1124 | Longest Well-Performing Interval | ✓ | ✓ | ✓ | Medium |
| 1123 | Lowest Common Ancestor of Deepest Leaves | ✓ | ✓ | ✓ | Medium |
| 1122 | Relative Sort Array | ✓ | ✓ | ✓ | Easy |
| 1121 | Divide Array Into Increasing Sequences | ✓ | ✓ | ✓ | Hard |
| 1120 | Maximum Average Subtree | ✓ | ✓ | ✓ | Medium |
| 1119 | Remove Vowels from a String | ✓ | ✓ | ✓ | Easy |
| 1118 | Number of Days in a Month | ✓ | ✓ | ✓ | Easy |
| 1117 | Building H2O | ✓ | ✓ | ✓ | Hard |
| 1116 | Print Zero Even Odd | ✓ | ✓ | ✓ | Medium |
| 1115 | Print FooBar Alternately | ✓ | ✓ | ✓ | Medium |
| 1114 | Print in Order | ✓ | ✓ | ✓ | Easy |
| 1113 | | ✓ | ✓ | ✓ | Easy |
| 1112 | | ✓ | ✓ | ✓ | Medium |
| 1111 | Maximum Nesting Depth of Two Valid Parentheses Strings | ✓ | ✓ | ✓ | Medium |
| 1110 | Delete Nodes And Return Forest | ✓ | ✓ | ✓ | Medium |
| 1109 | Corporate Flight Bookings | ✓ | ✓ | ✓ | Medium |
| 1108 | Defanging an IP Address | ✓ | ✓ | ✓ | Easy |
| 1107 | | ✓ | ✓ | ✓ | Medium |
| 1106 | Parsing A Boolean Expression | ✓ | ✓ | ✓ | Hard |
| 1105 | Filling Bookcase Shelves | ✓ | ✓ | ✓ | Medium |
| 1104 | Path In Zigzag Labelled Binary Tree | ✓ | ✓ | ✓ | Easy |
| 1103 | Distribute Candies to People | ✓ | ✓ | ✓ | Easy |
| 1102 | Path With Maximum Minimum Value | ✓ | ✓ | ✓ | Medium |
| 1101 | The Earliest Moment When Everyone Become Friends | ✓ | ✓ | ✓ | Medium |
| 1100 | Find K-Length Substrings With No Repeated Characters | ✓ | ✓ | ✓ | Medium |
| 1099 | Two Sum Less Than K | ✓ | ✓ | ✓ | Easy |
| 1098 | | ✓ | ✓ | ✓ | Medium |
| 1097 | | ✓ | ✓ | ✓ | Hard |
| 1096 | Brace Expansion II | ✓ | ✓ | ✓ | Hard |
| 1095 | Find in Mountain Array | ✓ | ✓ | ✓ | Hard |
| 1094 | Car Pooling | ✓ | ✓ | ✓ | Medium |
| 1093 | Statistics from a Large Sample | ✓ | ✓ | ✓ | Medium |
| 1092 | Shortest Common Supersequence | ✓ | ✓ | ✓ | Hard |
| 1091 | Shortest Path in Binary Matrix | ✓ | ✓ | ✓ | Medium |
| 1090 | Largest Values From Labels | ✓ | ✓ | ✓ | Medium |
| 1089 | Duplicate Zeros | ✓ | ✓ | ✓ | Easy |
| 1088 | Confusing Number II | ✓ | ✓ | ✓ | Hard |
| 1087 | Permutation of Letters | ✓ | ✓ | ✓ | Medium |
| 1086 | High Five | ✓ | ✓ | ✓ | Easy |
| 1085 | Sum of Digits in the Minimum Number | ✓ | ✓ | ✓ | Easy |
| 1084 | | ✓ | ✓ | ✓ | Easy |
| 1083 | | ✓ | ✓ | ✓ | Easy |
| 1082 | | ✓ | ✓ | ✓ | Easy |
| 1081 | Smallest Subsequence of Distinct Characters | ✓ | ✓ | ✓ | Medium |
| 1080 | Insufficient Nodes in Root to Leaf Paths | ✓ | ✓ | ✓ | Medium |
| 1079 | Letter Tile Possibilities | ✓ | ✓ | ✓ | Medium |
| 1078 | Occurrences After Bigram | ✓ | ✓ | ✓ | Easy |
| 1077 | | ✓ | ✓ | ✓ | Medium |
| 1076 | | ✓ | ✓ | ✓ | Easy |
| 1075 | | ✓ | ✓ | ✓ | Easy |
| 1074 | Number of Submatrices That Sum to Target | ✓ | ✓ | ✓ | Hard |
| 1073 | Adding Two Negabinary Numbers | ✓ | ✓ | ✓ | Medium |
| 1072 | Flip Columns For Maximum Number of Equal Rows | ✓ | ✓ | ✓ | Medium |
| 1071 | Greatest Common Divisor of Strings | ✓ | ✓ | ✓ | Easy |
| 1070 | | ✓ | ✓ | ✓ | Medium |
| 1069 | | ✓ | ✓ | ✓ | Easy |
| 1068 | | ✓ | ✓ | ✓ | Easy |
| 1067 | Digit Count in Range | ✓ | ✓ | ✓ | Hard |
| 1066 | Campus Bikes II | ✓ | ✓ | ✓ | Medium |
| 1065 | Index Pairs of a String | ✓ | ✓ | ✓ | Easy |
| 1064 | Fixed Point | ✓ | ✓ | ✓ | Easy |
| 1063 | | ✓ | ✓ | ✓ | Hard |
| 1062 | | ✓ | ✓ | ✓ | Medium |
| 1061 | | ✓ | ✓ | ✓ | Medium |
| 1060 | | ✓ | ✓ | ✓ | Medium |
| 1059 | | ✓ | ✓ | ✓ | Hard |
| 1058 | | ✓ | ✓ | ✓ | Medium |
| 1057 | | ✓ | ✓ | ✓ | Medium |
| 1056 | | ✓ | ✓ | ✓ | Easy |
| 1055 | | ✓ | ✓ | ✓ | Medium |
| 1054 | Distant Barcodes | ✓ | ✓ | ✓ | Medium |
| 1053 | Previous Permutation With One Swap | ✓ | ✓ | ✓ | Medium |
| 1052 | Grumpy Bookstore Owner | ✓ | ✓ | ✓ | Medium |
| 1051 | Height Checker | ✓ | ✓ | ✓ | Easy |
| 1050 | Actors and Directors Who Cooperated At Least Three Times | ✓ | ✓ | ✓ | Easy |
| 1049 | Last Stone Weight II | ✓ | ✓ | ✓ | Medium |
| 1048 | Longest String Chain | ✓ | ✓ | ✓ | Medium |
| 1047 | Remove All Adjacent Duplicates In String | ✓ | ✓ | ✓ | Easy |
| 1046 | Last Stone Weight | ✓ | ✓ | ✓ | Easy |
| 1045 | Customers Who Bought All Products | ✓ | ✓ | ✓ | Medium |
| 1043 | Partition Array for Maximum Sum | ✓ | ✓ | ✓ | Medium |
| 1042 | Flower Planting With No Adjacent | ✓ | ✓ | ✓ | Easy |
| 1041 | Robot Bounded In Circle | ✓ | ✓ | ✓ | Easy |
| 1040 | Moving Stones Until Consecutive II | ✓ | ✓ | ✓ | Medium |
| 1039 | Minimum Score Triangulation of Polygon | ✓ | ✓ | ✓ | Medium |
| 1038 | Binary Search Tree to Greater Sum Tree | ✓ | ✓ | ✓ | Medium |
| 1037 | Valid Boomerang | ✓ | ✓ | ✓ | Easy |
| 1036 | Escape a Large Maze | ✓ | ✓ | ✓ | Hard |
| 1035 | Uncrossed Lines | ✓ | ✓ | ✓ | Medium |
| 1034 | Coloring A Border | ✓ | ✓ | ✓ | Medium |
| 1033 | Moving Stones Until Consecutive | ✓ | ✓ | ✓ | Easy |
| 1032 | Stream of Characters | ✓ | ✓ | ✓ | Hard |
| 1031 | Maximum Sum of Two Non-Overlapping Subarrays | ✓ | ✓ | ✓ | Medium |
| 1030 | Matrix Cells in Distance Order | ✓ | ✓ | ✓ | Easy |
| 1029 | Two City Scheduling | ✓ | ✓ | ✓ | Easy |
| 1028 | Recover a Tree From Preorder Traversal | ✓ | ✓ | ✓ | Hard |
| 1027 | Longest Arithmetic Sequence | ✓ | ✓ | ✓ | Medium |
| 1026 | Maximum Difference Between Node and Ancestor | ✓ | ✓ | ✓ | Medium |
| 1025 | Divisor Game | ✓ | ✓ | ✓ | Easy |
| 1024 | Video Stitching | ✓ | ✓ | ✓ | Medium |
| 1023 | Camelcase Matching | ✓ | ✓ | ✓ | Medium |
| 1022 | Sum of Root To Leaf Binary Numbers | ✓ | ✓ | ✓ | Easy |
| 1021 | Remove Outermost Parentheses | ✓ | ✓ | ✓ | Easy |
| 1020 | Number of Enclaves | ✓ | ✓ | ✓ | Medium |
| 1019 | Next Greater Node In Linked List | ✓ | ✓ | ✓ | Medium |
| 1018 | Binary Prefix Divisible By 5 | ✓ | ✓ | ✓ | Easy |
| 1017 | Convert to Base -2 | ✓ | ✓ | ✓ | Medium |
| 1016 | Binary String With Substrings Representing 1 To N | ✓ | ✓ | ✓ | Medium |
| 1015 | Smallest Integer Divisible by K | ✓ | ✓ | ✓ | Medium |
| 1014 | Best Sightseeing Pair | ✓ | ✓ | ✓ | Medium |
| 1013 | Partition Array Into Three Parts With Equal Sum | ✓ | ✓ | ✓ | Easy |
| 1012 | Numbers With 1 Repeated Digit | ✓ | ✓ | ✓ | Hard |
| 1011 | Capacity To Ship Packages Within D Days | ✓ | ✓ | ✓ | Medium |
| 1010 | Pairs of Songs With Total Durations Divisible by 60 | ✓ | ✓ | ✓ | Easy |
| 1009 | Complement of Base 10 Integer | ✓ | ✓ | ✓ | Easy |
| 1008 | Construct Binary Search Tree from Preorder Traversal | ✓ | ✓ | ✓ | Medium |
| 1007 | Minimum Domino Rotations For Equal Row | ✓ | ✓ | ✓ | Medium |
| 1006 | Clumsy Factorial | ✓ | ✓ | ✓ | Medium |
| 1005 | Maximize Sum Of Array After K Negations | ✓ | ✓ | ✓ | Easy |
| 1004 | Max Consecutive Ones III | ✓ | ✓ | ✓ | Medium |
| 1003 | Check If Word Is Valid After Substitutions | ✓ | ✓ | ✓ | Medium |
| 1002 | Find Common Characters | ✓ | ✓ | ✓ | Easy |
| 1001 | Grid Illumination | ✓ | ✓ | ✓ | Hard |
| 1000 | Minimum Cost to Merge Stones | ✓ | ✓ | ✓ | Hard |
| 999 | Available Captures for Rook | ✓ | ✓ | ✓ | Easy |
| 998 | Maximum Binary Tree II | ✓ | ✓ | ✓ | Medium |
| 997 | Find the Town Judge | ✓ | ✓ | ✓ | Easy |
| 996 | Number of Squareful Arrays | ✓ | ✓ | ✓ | Hard |
| 995 | Minimum Number of K Consecutive Bit Flips | ✓ | ✓ | ✓ | Hard |
| 994 | Rotting Oranges | ✓ | ✓ | ✓ | Easy |
| 993 | Cousins in Binary Tree | ✓ | ✓ | ✓ | Easy |
| 992 | Subarrays with K Different Integers | ✓ | ✓ | ✓ | Hard |
| 991 | Broken Calculator | ✓ | ✓ | ✓ | Medium |
| 990 | Satisfiability of Equality Equations | ✓ | ✓ | ✓ | Medium |
| 989 | Add to Array-Form of Integer | ✓ | ✓ | ✓ | Easy |
| 988 | Smallest String Starting From Leaf | ✓ | ✓ | ✓ | Medium |
| 987 | Vertical Order Traversal of a Binary Tree | ✓ | ✓ | ✓ | Medium |
| 986 | Interval List Intersections | ✓ | ✓ | ✓ | Medium |
| 985 | Sum of Even Numbers After Queries | ✓ | ✓ | ✓ | Easy |
| 984 | String Without AAA or BBB | ✓ | ✓ | ✓ | Medium |
| 983 | Minimum Cost For Tickets | ✓ | ✓ | ✓ | Medium |
| 982 | Triples with Bitwise AND Equal To Zero | ✓ | ✓ | ✓ | Hard |
| 981 | Time Based Key-Value Store | ✓ | ✓ | ✓ | Medium |
| 980 | Unique Paths III | ✓ | ✓ | ✓ | Hard |
| 979 | Distribute Coins in Binary Tree | ✓ | ✓ | ✓ | Medium |
| 978 | Longest Turbulent Subarray | ✓ | ✓ | ✓ | Medium |
| 977 | Squares of a Sorted Array | ✓ | ✓ | ✓ | Easy |
| 976 | Largest Perimeter Triangle | ✓ | ✓ | ✓ | Easy |
| 975 | Odd Even Jump | ✓ | ✓ | ✓ | Hard |
| 974 | Subarray Sums Divisible by K | ✓ | ✓ | ✓ | Medium |
| 973 | K Closest Points to Origin | ✓ | ✓ | ✓ | Medium |
| 972 | Equal Rational Numbers | ✓ | ✓ | ✓ | Hard |
| 971 | Flip Binary Tree To Match Preorder Traversal | ✓ | ✓ | ✓ | Medium |
| 970 | Powerful Integers | ✓ | ✓ | ✓ | Easy |
| 969 | Pancake Sorting | ✓ | ✓ | ✓ | Medium |
| 968 | Binary Tree Cameras | ✓ | ✓ | ✓ | Hard |
| 967 | Numbers With Same Consecutive Differences | ✓ | ✓ | ✓ | Medium |
| 966 | Vowel Spellchecker | ✓ | ✓ | ✓ | Medium |
| 965 | Univalued Binary Tree | ✓ | ✓ | ✓ | Easy |
| 964 | Least Operators to Express Number | ✓ | ✓ | ✓ | Hard |
| 963 | Minimum Area Rectangle II | ✓ | ✓ | ✓ | Medium |
| 962 | Maximum Width Ramp | ✓ | ✓ | ✓ | Medium |
| 961 | N-Repeated Element in Size 2N Array | ✓ | ✓ | ✓ | Easy |
| 960 | Delete Columns to Make Sorted III | ✓ | ✓ | ✓ | Hard |
| 959 | Regions Cut By Slashes | ✓ | ✓ | ✓ | Medium |
| 958 | Check Completeness of a Binary Tree | ✓ | ✓ | ✓ | Medium |
| 957 | Prison Cells After N Days | ✓ | ✓ | ✓ | Medium |
| 956 | Tallest Billboard | ✓ | ✓ | ✓ | Hard |
| 955 | Delete Columns to Make Sorted II | ✓ | ✓ | ✓ | Medium |
| 954 | Array of Doubled Pairs | ✓ | ✓ | ✓ | Medium |
| 953 | Verifying an Alien Dictionary | ✓ | ✓ | ✓ | Easy |
| 952 | Largest Component Size by Common Factor | ✓ | ✓ | ✓ | Hard |
| 951 | Flip Equivalent Binary Trees | ✓ | ✓ | ✓ | Medium |
| 950 | Reveal Cards In Increasing Order | ✓ | ✓ | ✓ | Medium |
| 949 | Largest Time for Given Digits | ✓ | ✓ | ✓ | Easy |
| 948 | Bag of Tokens | ✓ | ✓ | ✓ | Medium |
| 947 | Most Stones Removed with Same Row or Column | ✓ | ✓ | ✓ | Medium |
| 946 | Validate Stack Sequences | ✓ | ✓ | ✓ | Medium |
| 945 | Minimum Increment to Make Array Unique | ✓ | ✓ | ✓ | Medium |
| 944 | Delete Columns to Make Sorted | ✓ | ✓ | ✓ | Easy |
| 943 | Find the Shortest Superstring | ✓ | ✓ | ✓ | Hard |
| 942 | DI String Match | ✓ | ✓ | ✓ | Easy |
| 941 | Valid Mountain Array | ✓ | ✓ | ✓ | Easy |
| 940 | Distinct Subsequences II | ✓ | ✓ | ✓ | Hard |
| 939 | Minimum Area Rectangle | ✓ | ✓ | ✓ | Medium |
| 938 | Range Sum of BST | ✓ | ✓ | ✓ | Medium |
| 937 | Reorder Log Files | ✓ | ✓ | ✓ | Easy |
| 936 | Stamping The Sequence | ✓ | ✓ | ✓ | Hard |
| 935 | Knight Dialer | ✓ | ✓ | ✓ | Medium |
| 934 | Shortest Bridge | ✓ | ✓ | ✓ | Medium |
| 933 | Number of Recent Calls | ✓ | ✓ | ✓ | Easy |
| 932 | Beautiful Array | ✓ | ✓ | ✓ | Medium |
| 931 | Minimum Falling Path Sum | ✓ | ✓ | ✓ | Medium |
| 930 | Binary Subarrays With Sum | ✓ | ✓ | ✓ | Medium |
| 929 | Unique Email Addresses | ✓ | ✓ | ✓ | Easy |
| 928 | Minimize Malware Spread II | ✓ | ✓ | ✓ | Hard |
| 927 | Three Equal Parts | ✓ | ✓ | ✓ | Hard |
| 926 | Flip String to Monotone Increasing | ✓ | ✓ | ✓ | Medium |
| 925 | Long Pressed Name | ✓ | ✓ | ✓ | Easy |
| 924 | Minimize Malware Spread | ✓ | ✓ | ✓ | Hard |
| 923 | 3Sum With Multiplicity | ✓ | ✓ | ✓ | Medium |
| 922 | Sort Array By Parity II | ✓ | ✓ | ✓ | Easy |
| 921 | Minimum Add to Make Parentheses Valid | ✓ | ✓ | ✓ | Medium |
| 920 | Number of Music Playlists | ✓ | ✓ | ✓ | Hard |
| 919 | Complete Binary Tree Inserter | ✓ | ✓ | ✓ | Medium |
| 918 | Maximum Sum Circular Subarray | ✓ | ✓ | ✓ | Medium |
| 917 | Reverse Only Letters | ✓ | ✓ | ✓ | Easy |
| 916 | Word Subsets | ✓ | ✓ | ✓ | Medium |
| 915 | Partition Array into Disjoint Intervals | ✓ | ✓ | ✓ | Medium |
| 914 | X of a Kind in a Deck of Cards | ✓ | ✓ | ✓ | Easy |
| 913 | Cat and Mouse | ✓ | ✓ | ✓ | Hard |
| 912 | Sort an Array | ✓ | ✓ | ✓ | Medium |
| 911 | Online Election | ✓ | ✓ | ✓ | Medium |
| 910 | Smallest Range II | ✓ | ✓ | ✓ | Medium |
| 909 | Snakes and Ladders | ✓ | ✓ | ✓ | Medium |
| 908 | Smallest Range I | ✓ | ✓ | ✓ | Easy |
| 907 | Sum of Subarray Minimums | ✓ | ✓ | ✓ | Medium |
| 906 | Super Palindromes | ✓ | ✓ | ✓ | Hard |
| 905 | Sort Array By Parity | ✓ | ✓ | ✓ | Easy |
| 904 | Fruit Into Baskets | ✓ | ✓ | ✓ | Medium |
| 903 | Valid Permutations for DI Sequence | ✓ | ✓ | ✓ | Hard |
| 902 | Numbers At Most N Given Digit Set | ✓ | ✓ | ✓ | Hard |
| 901 | Online Stock Span | ✓ | ✓ | ✓ | Medium |
| 900 | RLE Iterator | ✓ | ✓ | ✓ | Medium |
| 899 | Orderly Queue | ✓ | ✓ | ✓ | Hard |
| 898 | Bitwise ORs of Subarrays | ✓ | ✓ | ✓ | Medium |
| 897 | Increasing Order Search Tree | ✓ | ✓ | ✓ | Easy |
| 896 | Monotonic Array | ✓ | ✓ | ✓ | Easy |
| 895 | Maximum Frequency Stack | ✓ | ✓ | ✓ | Hard |
| 894 | All Possible Full Binary Trees | ✓ | ✓ | ✓ | Medium |
| 893 | Groups of Special-Equivalent Strings | ✓ | ✓ | ✓ | Easy |
| 892 | Surface Area of 3D Shapes | ✓ | ✓ | ✓ | Easy |
| 891 | Sum of Subsequence Widths | ✓ | ✓ | ✓ | Hard |
| 890 | Find and Replace Pattern | ✓ | ✓ | ✓ | Medium |
| 889 | Construct Binary Tree from Preorder and Postorder Traversal | ✓ | ✓ | ✓ | Medium |
| 888 | Fair Candy Swap | ✓ | ✓ | ✓ | Easy |
| 887 | Super Egg Drop | ✓ | ✓ | ✓ | Hard |
| 886 | Possible Bipartition | ✓ | ✓ | ✓ | Medium |
| 885 | Spiral Matrix III | ✓ | ✓ | ✓ | Medium |
| 884 | Uncommon Words from Two Sentences | ✓ | ✓ | ✓ | Easy |
| 883 | Projection Area of 3D Shapes | ✓ | ✓ | ✓ | Easy |
| 882 | Reachable Nodes In Subdivided Graph | ✓ | ✓ | ✓ | Hard |
| 881 | Boats to Save People | ✓ | ✓ | ✓ | Medium |
| 880 | Decoded String at Index | ✓ | ✓ | ✓ | Medium |
| 879 | Profitable Schemes | ✓ | ✓ | ✓ | Hard |
| 878 | Nth Magical Number | ✓ | ✓ | ✓ | Hard |
| 877 | Stone Game | ✓ | ✓ | ✓ | Medium |
| 876 | Middle of the Linked List | ✓ | ✓ | ✓ | Easy |
| 875 | Koko Eating Bananas | ✓ | ✓ | ✓ | Medium |
| 874 | Walking Robot Simulation | ✓ | ✓ | ✓ | Easy |
| 873 | Length of Longest Fibonacci Subsequence | ✓ | ✓ | ✓ | Medium |
| 872 | Leaf-Similar Trees | ✓ | ✓ | ✓ | Easy |
| 871 | Minimum Number of Refueling Stops | ✓ | ✓ | ✓ | Hard |
| 870 | Advantage Shuffle | ✓ | ✓ | ✓ | Medium |
| 869 | Reordered Power of 2 | ✓ | ✓ | ✓ | Medium |
| 868 | Binary Gap | ✓ | ✓ | ✓ | Easy |
| 867 | Transpose Matrix | ✓ | ✓ | ✓ | Easy |
| 866 | Prime Palindrome | ✓ | ✓ | ✓ | Medium |
| 865 | Smallest Subtree with all the Deepest Nodes | ✓ | ✓ | ✓ | Medium |
| 864 | Shortest Path to Get All Keys | ✓ | ✓ | ✓ | Hard |
| 863 | All Nodes Distance K in Binary Tree | ✓ | ✓ | ✓ | Medium |
| 862 | Shortest Subarray with Sum at Least K | ✓ | ✓ | ✓ | Hard |
| 861 | Score After Flipping Matrix | ✓ | ✓ | ✓ | Medium |
| 860 | Lemonade Change | ✓ | ✓ | ✓ | Easy |
| 859 | Buddy Strings | ✓ | ✓ | ✓ | Easy |
| 858 | Mirror Reflection | ✓ | ✓ | ✓ | Medium |
| 857 | Minimum Cost to Hire K Workers | ✓ | ✓ | ✓ | Hard |
| 856 | Score of Parentheses | ✓ | ✓ | ✓ | Medium |
| 855 | Exam Room | ✓ | ✓ | ✓ | Medium |
| 854 | K-Similar Strings | ✓ | ✓ | ✓ | Hard |
| 853 | Car Fleet | ✓ | ✓ | ✓ | Medium |
| 852 | Peak Index in a Mountain Array | ✓ | ✓ | ✓ | Easy |
| 851 | Loud and Rich | ✓ | ✓ | ✓ | Medium |
| 850 | Rectangle Area II | ✓ | ✓ | ✓ | Hard |
| 849 | Maximize Distance to Closest Person | ✓ | ✓ | ✓ | Easy |
| 848 | Shifting Letters | ✓ | ✓ | ✓ | Medium |
| 847 | Shortest Path Visiting All Nodes | ✓ | ✓ | ✓ | Hard |
| 846 | Hand of Straights | ✓ | ✓ | ✓ | Medium |
| 845 | Longest Mountain in Array | ✓ | ✓ | ✓ | Medium |
| 844 | Backspace String Compare | ✓ | ✓ | ✓ | Easy |
| 843 | Guess the Word | ✓ | ✓ | ✓ | Hard |
| 842 | Split Array into Fibonacci Sequence | ✓ | ✓ | ✓ | Medium |
| 841 | Keys and Rooms | ✓ | ✓ | ✓ | Medium |
| 840 | Magic Squares In Grid | ✓ | ✓ | ✓ | Easy |
| 839 | Similar String Groups | ✓ | ✓ | ✓ | Hard |
| 838 | Push Dominoes | ✓ | ✓ | ✓ | Medium |
| 837 | New 21 Game | ✓ | ✓ | ✓ | Medium |
| 836 | Rectangle Overlap | ✓ | ✓ | ✓ | Easy |
| 835 | Image Overlap | ✓ | ✓ | ✓ | Medium |
| 834 | Sum of Distances in Tree | ✓ | ✓ | ✓ | Hard |
| 833 | Find And Replace in String | ✓ | ✓ | ✓ | Medium |
| 832 | Flipping an Image | ✓ | ✓ | ✓ | Easy |
| 831 | Masking Personal Information | ✓ | ✓ | ✓ | Medium |
| 830 | Positions of Large Groups | ✓ | ✓ | ✓ | Easy |
| 829 | Consecutive Numbers Sum | ✓ | ✓ | ✓ | Hard |
| 828 | Unique Letter String | ✓ | ✓ | ✓ | Hard |
| 827 | Making A Large Island | ✓ | ✓ | ✓ | Hard |
| 826 | Most Profit Assigning Work | ✓ | ✓ | ✓ | Medium |
| 825 | Friends Of Appropriate Ages | ✓ | ✓ | ✓ | Medium |
| 824 | Goat Latin | ✓ | ✓ | ✓ | Easy |
| 823 | Binary Trees With Factors | ✓ | ✓ | ✓ | Medium |
| 822 | Card Flipping Game | ✓ | ✓ | ✓ | Medium |
| 821 | Shortest Distance to a Character | ✓ | ✓ | ✓ | Easy |
| 820 | Short Encoding of Words | ✓ | ✓ | ✓ | Medium |
| 819 | Most Common Word | ✓ | ✓ | ✓ | Easy |
| 818 | Race Car | ✓ | ✓ | ✓ | Hard |
| 817 | Linked List Components | ✓ | ✓ | ✓ | Medium |
| 816 | Ambiguous Coordinates | ✓ | ✓ | ✓ | Medium |
| 815 | Bus Routes | ✓ | ✓ | ✓ | Hard |
| 814 | Binary Tree Pruning | ✓ | ✓ | ✓ | Medium |
| 813 | Largest Sum of Averages | ✓ | ✓ | ✓ | Medium |
| 812 | Largest Triangle Area | ✓ | ✓ | ✓ | Easy |
| 811 | Subdomain Visit Count | ✓ | ✓ | ✓ | Easy |
| 810 | Chalkboard XOR Game | ✓ | ✓ | ✓ | Hard |
| 809 | Expressive Words | ✓ | ✓ | ✓ | Medium |
| 808 | Soup Servings | ✓ | ✓ | ✓ | Medium |
| 807 | Max Increase to Keep City Skyline | ✓ | ✓ | ✓ | Medium |
| 806 | Number of Lines To Write String | ✓ | ✓ | ✓ | Easy |
| 805 | Split Array With Same Average | ✓ | ✓ | ✓ | Hard |
| 804 | Unique Morse Code Words | ✓ | ✓ | ✓ | Easy |
| 803 | Bricks Falling When Hit | ✓ | ✓ | ✓ | Hard |
| 802 | Find Eventual Safe States | ✓ | ✓ | ✓ | Medium |
| 801 | Minimum Swaps To Make Sequences Increasing | ✓ | ✓ | ✓ | Medium |
| 800 | | ✓ | ✓ | ✓ | Easy |
| 799 | Champagne Tower | ✓ | ✓ | ✓ | Medium |
| 798 | Smallest Rotation with Highest Score | ✓ | ✓ | ✓ | Hard |
| 797 | All Paths From Source to Target | ✓ | ✓ | ✓ | Medium |
| 796 | Rotate String | ✓ | ✓ | ✓ | Easy |
| 795 | Number of Subarrays with Bounded Maximum | ✓ | ✓ | ✓ | Medium |
| 794 | Valid Tic-Tac-Toe State | ✓ | ✓ | ✓ | Medium |
| 793 | Preimage Size of Factorial Zeroes Function | ✓ | ✓ | ✓ | Hard |
| 792 | Number of Matching Subsequences | ✓ | ✓ | ✓ | Medium |
| 791 | Custom Sort String | ✓ | ✓ | ✓ | Medium |
| 790 | Domino and Tromino Tiling | ✓ | ✓ | ✓ | Medium |
| 789 | Escape The Ghosts | ✓ | ✓ | ✓ | Medium |
| 788 | Rotated Digits | ✓ | ✓ | ✓ | Easy |
| 787 | Cheapest Flights Within K Stops | ✓ | ✓ | ✓ | Medium |
| 786 | K-th Smallest Prime Fraction | ✓ | ✓ | ✓ | Hard |
| 785 | Is Graph Bipartite? | ✓ | ✓ | ✓ | Medium |
| 784 | Letter Case Permutation | ✓ | ✓ | ✓ | Easy |
| 783 | Minimum Distance Between BST Nodes | ✓ | ✓ | ✓ | Easy |
| 782 | Transform to Chessboard | ✓ | ✓ | ✓ | Hard |
| 781 | Rabbits in Forest | ✓ | ✓ | ✓ | Medium |
| 780 | Reaching Points | ✓ | ✓ | ✓ | Hard |
| 779 | K-th Symbol in Grammar | ✓ | ✓ | ✓ | Medium |
| 778 | Swim in Rising Water | ✓ | ✓ | ✓ | Hard |
| 777 | Swap Adjacent in LR String | ✓ | ✓ | ✓ | Medium |
| 776 | | ✓ | ✓ | ✓ | Medium |
| 775 | Global and Local Inversions | ✓ | ✓ | ✓ | Medium |
| 774 | | ✓ | ✓ | ✓ | Hard |
| 773 | Sliding Puzzle | ✓ | ✓ | ✓ | Hard |
| 772 | | ✓ | ✓ | ✓ | Hard |
| 771 | Jewels and Stones | ✓ | ✓ | ✓ | Easy |
| 770 | Basic Calculator IV | ✓ | ✓ | ✓ | Hard |
| 769 | Max Chunks To Make Sorted | ✓ | ✓ | ✓ | Medium |
| 768 | Max Chunks To Make Sorted II | ✓ | ✓ | ✓ | Hard |
| 767 | Reorganize String | ✓ | ✓ | ✓ | Medium |
| 766 | Toeplitz Matrix | ✓ | ✓ | ✓ | Easy |
| 765 | Couples Holding Hands | ✓ | ✓ | ✓ | Hard |
| 764 | Largest Plus Sign | ✓ | ✓ | ✓ | Medium |
| 763 | Partition Labels | ✓ | ✓ | ✓ | Medium |
| 762 | Prime Number of Set Bits in Binary Representation | ✓ | ✓ | ✓ | Easy |
| 761 | Special Binary String | ✓ | ✓ | ✓ | Hard |
| 760 | | ✓ | ✓ | ✓ | Easy |
| 759 | | ✓ | ✓ | ✓ | Hard |
| 758 | | ✓ | ✓ | ✓ | Easy |
| 757 | Set Intersection Size At Least Two | ✓ | ✓ | ✓ | Hard |
| 756 | Pyramid Transition Matrix | ✓ | ✓ | ✓ | Medium |
| 755 | | ✓ | ✓ | ✓ | Medium |
| 754 | Reach a Number | ✓ | ✓ | ✓ | Easy |
| 753 | Cracking the Safe | ✓ | ✓ | ✓ | Hard |
| 752 | Open the Lock | ✓ | ✓ | ✓ | Medium |
| 751 | | ✓ | ✓ | ✓ | Easy |
| 750 | | ✓ | ✓ | ✓ | Medium |
| 749 | Contain Virus | ✓ | ✓ | ✓ | Hard |
| 748 | Shortest Completing Word | ✓ | ✓ | ✓ | Easy |
| 747 | Largest Number At Least Twice of Others | ✓ | ✓ | ✓ | Easy |
| 746 | Min Cost Climbing Stairs | ✓ | ✓ | ✓ | Easy |
| 745 | Prefix and Suffix Search | ✓ | ✓ | ✓ | Hard |
| 744 | Find Smallest Letter Greater Than Target | ✓ | ✓ | ✓ | Easy |
| 743 | Network Delay Time | ✓ | ✓ | ✓ | Medium |
| 742 | | ✓ | ✓ | ✓ | Medium |
| 741 | Cherry Pickup | ✓ | ✓ | ✓ | Hard |
| 740 | Delete and Earn | ✓ | ✓ | ✓ | Medium |
| 739 | Daily Temperatures | ✓ | ✓ | ✓ | Medium |
| 738 | Monotone Increasing Digits | ✓ | ✓ | ✓ | Medium |
| 737 | | ✓ | ✓ | ✓ | Medium |
| 736 | Parse Lisp Expression | ✓ | ✓ | ✓ | Medium |
| 735 | Asteroid Collision | ✓ | ✓ | ✓ | Medium |
| 734 | | ✓ | ✓ | ✓ | Easy |
| 733 | Flood Fill | ✓ | ✓ | ✓ | Easy |
| 732 | My Calendar III | ✓ | ✓ | ✓ | Hard |
| 731 | My Calendar II | ✓ | ✓ | ✓ | Medium |
| 730 | Count Different Palindromic Subsequences | ✓ | ✓ | ✓ | Hard |
| 729 | My Calendar I | ✓ | ✓ | ✓ | Medium |
| 728 | Self Dividing Numbers | ✓ | ✓ | ✓ | Easy |
| 727 | | ✓ | ✓ | ✓ | Hard |
| 726 | Number of Atoms | ✓ | ✓ | ✓ | Hard |
| 725 | Split Linked List in Parts | ✓ | ✓ | ✓ | Medium |
| 724 | Find Pivot Index | ✓ | ✓ | ✓ | Easy |
| 723 | | ✓ | ✓ | ✓ | Medium |
| 722 | Remove Comments | ✓ | ✓ | ✓ | Medium |
| 721 | Accounts Merge | ✓ | ✓ | ✓ | Medium |
| 720 | Longest Word in Dictionary | ✓ | ✓ | ✓ | Easy |
| 719 | Find K-th Smallest Pair Distance | ✓ | ✓ | ✓ | Hard |
| 718 | Maximum Length of Repeated Subarray | ✓ | ✓ | ✓ | Medium |
| 717 | | ✓ | ✓ | ✓ | Easy |
| 716 | | ✓ | ✓ | ✓ | Easy |
| 715 | Range Module | ✓ | ✓ | ✓ | Hard |
| 714 | Best Time to Buy and Sell Stock with Transaction Fee | ✓ | ✓ | ✓ | Medium |
| 713 | Subarray Product Less Than K | ✓ | ✓ | ✓ | Medium |
| 712 | Minimum ASCII Delete Sum for Two Strings | ✓ | ✓ | ✓ | Medium |
| 711 | | ✓ | ✓ | ✓ | Hard |
| 710 | Random Pick with Blacklist | ✓ | ✓ | ✓ | Hard |
| 709 | To Lower Case | ✓ | ✓ | ✓ | Easy |
| 708 | | ✓ | ✓ | ✓ | Medium |
| 707 | Design Linked List | ✓ | ✓ | ✓ | Easy |
| 706 | Design HashMap | ✓ | ✓ | ✓ | Easy |
| 705 | Design HashSet | ✓ | ✓ | ✓ | Easy |
| 704 | Binary Search | ✓ | ✓ | ✓ | Easy |
| 703 | Kth Largest Element in a Stream | ✓ | ✓ | ✓ | Easy |
| 702 | | ✓ | ✓ | ✓ | Medium |
| 701 | Insert into a Binary Search Tree | ✓ | ✓ | ✓ | Medium |
| 700 | Search in a Binary Search Tree | ✓ | ✓ | ✓ | Easy |
| 699 | Falling Squares | ✓ | ✓ | ✓ | Hard |
| 698 | Partition to K Equal Sum Subsets | ✓ | ✓ | ✓ | Medium |
| 697 | Degree of an Array | ✓ | ✓ | ✓ | Easy |
| 696 | Count Binary Substrings | ✓ | ✓ | ✓ | Easy |
| 695 | Max Area of Island | ✓ | ✓ | ✓ | Medium |
| 694 | | ✓ | ✓ | ✓ | Medium |
| 693 | Binary Number with Alternating Bits | ✓ | ✓ | ✓ | Easy |
| 692 | Top K Frequent Words | ✓ | ✓ | ✓ | Medium |
| 691 | Stickers to Spell Word | ✓ | ✓ | ✓ | Hard |
| 690 | Employee Importance | ✓ | ✓ | ✓ | Easy |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | ✓ | ✓ | ✓ | Hard |
| 688 | Knight Probability in Chessboard | ✓ | ✓ | ✓ | Medium |
| 687 | Longest Univalue Path | ✓ | ✓ | ✓ | Easy |
| 686 | Repeated String Match | ✓ | ✓ | ✓ | Easy |
| 685 | Redundant Connection II | ✓ | ✓ | ✓ | Hard |
| 684 | Redundant Connection | ✓ | ✓ | ✓ | Medium |
| 683 | | ✓ | ✓ | ✓ | Hard |
| 682 | Baseball Game | ✓ | ✓ | ✓ | Easy |
| 681 | | ✓ | ✓ | ✓ | Medium |
| 680 | Valid Palindrome II | ✓ | ✓ | ✓ | Easy |
| 679 | 24 Game | ✓ | ✓ | ✓ | Medium |
| 678 | Valid Parenthesis String | ✓ | ✓ | ✓ | Medium |
| 677 | Map Sum Pairs | ✓ | ✓ | ✓ | Medium |
| 676 | Implement Magic Dictionary | ✓ | ✓ | ✓ | Medium |
| 675 | Cut Off Trees for Golf Event | ✓ | ✓ | ✓ | Hard |
| 674 | Longest Continuous Increasing Subsequence | ✓ | ✓ | ✓ | Easy |
| 673 | Number of Longest Increasing Subsequence | ✓ | ✓ | ✓ | Medium |
| 672 | Bulb Switcher II | ✓ | ✓ | ✓ | Medium |
| 671 | Second Minimum Node In a Binary Tree | ✓ | ✓ | ✓ | Easy |
| 670 | Maximum Swap | ✓ | ✓ | ✓ | Medium |
| 669 | Trim a Binary Search Tree | ✓ | ✓ | ✓ | Easy |
| 668 | Kth Smallest Number in Multiplication Table | ✓ | ✓ | ✓ | Hard |
| 667 | Beautiful Arrangement II | ✓ | ✓ | ✓ | Medium |
| 666 | | ✓ | ✓ | ✓ | Medium |
| 665 | Non-decreasing Array | ✓ | ✓ | ✓ | Medium |
| 664 | Strange Printer | ✓ | ✓ | ✓ | Medium |
| 663 | | ✓ | ✓ | ✓ | Medium |
| 662 | Maximum Width of Binary Tree | ✓ | ✓ | ✓ | Medium |
| 661 | Image Smoother | ✓ | ✓ | ✓ | Easy |
| 660 | | ✓ | ✓ | ✓ | Hard |
| 659 | Split Array into Consecutive Subsequences | ✓ | ✓ | ✓ | Medium |
| 658 | Find K Closest Elements | ✓ | ✓ | ✓ | Medium |
| 657 | Robot Return to Origin | ✓ | ✓ | ✓ | Easy |
| 656 | | ✓ | ✓ | ✓ | Hard |
| 655 | Print Binary Tree | ✓ | ✓ | ✓ | Medium |
| 654 | Maximum Binary Tree | ✓ | ✓ | ✓ | Medium |
| 653 | Two Sum IV - Input is a BST | ✓ | ✓ | ✓ | Easy |
| 652 | Find Duplicate Subtrees | ✓ | ✓ | ✓ | Medium |
| 651 | | ✓ | ✓ | ✓ | Medium |
| 650 | 2 Keys Keyboard | ✓ | ✓ | ✓ | Medium |
| 649 | Dota2 Senate | ✓ | ✓ | ✓ | Medium |
| 648 | Replace Words | ✓ | ✓ | ✓ | Medium |
| 647 | Palindromic Substrings | ✓ | ✓ | ✓ | Medium |
| 646 | Maximum Length of Pair Chain | ✓ | ✓ | ✓ | Medium |
| 645 | Set Mismatch | ✓ | ✓ | ✓ | Easy |
| 644 | | ✓ | ✓ | ✓ | Hard |
| 643 | Maximum Average Subarray I | ✓ | ✓ | ✓ | Easy |
| 642 | | ✓ | ✓ | ✓ | Hard |
| 641 | Design Circular Deque | ✓ | ✓ | ✓ | Medium |
| 640 | Solve the Equation | ✓ | ✓ | ✓ | Medium |
| 639 | Decode Ways II | ✓ | ✓ | ✓ | Hard |
| 638 | Shopping Offers | ✓ | ✓ | ✓ | Medium |
| 637 | Average of Levels in Binary Tree | ✓ | ✓ | ✓ | Easy |
| 636 | Exclusive Time of Functions | ✓ | ✓ | ✓ | Medium |
| 635 | | ✓ | ✓ | ✓ | Medium |
| 634 | | ✓ | ✓ | ✓ | Medium |
| 633 | Sum of Square Numbers | ✓ | ✓ | ✓ | Easy |
| 632 | Smallest Range | ✓ | ✓ | ✓ | Hard |
| 631 | | ✓ | ✓ | ✓ | Hard |
| 630 | Course Schedule III | ✓ | ✓ | ✓ | Hard |
| 629 | K Inverse Pairs Array | ✓ | ✓ | ✓ | Hard |
| 628 | Maximum Product of Three Numbers | ✓ | ✓ | ✓ | Easy |
| 627 | Swap Salary | ✓ | ✓ | ✓ | Easy |
| 626 | Exchange Seats | ✓ | ✓ | ✓ | Medium |
| 625 | | ✓ | ✓ | ✓ | Medium |
| 624 | | ✓ | ✓ | ✓ | Easy |
| 623 | Add One Row to Tree | ✓ | ✓ | ✓ | Medium |
| 622 | Design Circular Queue | ✓ | ✓ | ✓ | Medium |
| 621 | Task Scheduler | ✓ | ✓ | ✓ | Medium |
| 620 | Not Boring Movies | ✓ | ✓ | ✓ | Easy |
| 619 | | ✓ | ✓ | ✓ | Easy |
| 618 | | ✓ | ✓ | ✓ | Hard |
| 617 | Merge Two Binary Trees | ✓ | ✓ | ✓ | Easy |
| 616 | | ✓ | ✓ | ✓ | Medium |
| 615 | | ✓ | ✓ | ✓ | Hard |
| 614 | | ✓ | ✓ | ✓ | Medium |
| 613 | | ✓ | ✓ | ✓ | Easy |
| 612 | | ✓ | ✓ | ✓ | Medium |
| 611 | Valid Triangle Number | ✓ | ✓ | ✓ | Medium |
| 610 | | ✓ | ✓ | ✓ | Easy |
| 609 | Find Duplicate File in System | ✓ | ✓ | ✓ | Medium |
| 608 | | ✓ | ✓ | ✓ | Medium |
| 607 | | ✓ | ✓ | ✓ | Easy |
| 606 | Construct String from Binary Tree | ✓ | ✓ | ✓ | Easy |
| 605 | Can Place Flowers | ✓ | ✓ | ✓ | Easy |
| 604 | | ✓ | ✓ | ✓ | Easy |
| 603 | | ✓ | ✓ | ✓ | Easy |
| 602 | | ✓ | ✓ | ✓ | Medium |
| 601 | Human Traffic of Stadium | ✓ | ✓ | ✓ | Hard |
| 600 | Non-negative Integers without Consecutive Ones | ✓ | ✓ | ✓ | Hard |
| 599 | Minimum Index Sum of Two Lists | ✓ | ✓ | ✓ | Easy |
| 598 | Range Addition II | ✓ | ✓ | ✓ | Easy |
| 597 | | ✓ | ✓ | ✓ | Easy |
| 596 | Classes More Than 5 Students | ✓ | ✓ | ✓ | Easy |
| 595 | Big Countries | ✓ | ✓ | ✓ | Easy |
| 594 | Longest Harmonious Subsequence | ✓ | ✓ | ✓ | Easy |
| 593 | Valid Square | ✓ | ✓ | ✓ | Medium |
| 592 | Fraction Addition and Subtraction | ✓ | ✓ | ✓ | Medium |
| 591 | Tag Validator | ✓ | ✓ | ✓ | Hard |
| 590 | | ✓ | ✓ | ✓ | Easy |
| 589 | | ✓ | ✓ | ✓ | Easy |
| 588 | | ✓ | ✓ | ✓ | Hard |
| 587 | Erect the Fence | ✓ | ✓ | ✓ | Hard |
| 586 | | ✓ | ✓ | ✓ | Easy |
| 585 | | ✓ | ✓ | ✓ | Medium |
| 584 | | ✓ | ✓ | ✓ | Easy |
| 583 | Delete Operation for Two Strings | ✓ | ✓ | ✓ | Medium |
| 582 | | ✓ | ✓ | ✓ | Medium |
| 581 | Shortest Unsorted Continuous Subarray | ✓ | ✓ | ✓ | Easy |
| 580 | | ✓ | ✓ | ✓ | Medium |
| 579 | | ✓ | ✓ | ✓ | Hard |
| 578 | | ✓ | ✓ | ✓ | Medium |
| 577 | Employee Bonus | ✓ | ✓ | ✓ | Easy |
| 576 | Out of Boundary Paths | ✓ | ✓ | ✓ | Medium |
| 575 | Distribute Candies | ✓ | ✓ | ✓ | Easy |
| 574 | | ✓ | ✓ | ✓ | Medium |
| 573 | | ✓ | ✓ | ✓ | Medium |
| 572 | Subtree of Another Tree | ✓ | ✓ | ✓ | Easy |
| 571 | | ✓ | ✓ | ✓ | Hard |
| 570 | | ✓ | ✓ | ✓ | Medium |
| 569 | | ✓ | ✓ | ✓ | Hard |
| 568 | | ✓ | ✓ | ✓ | Hard |
| 567 | Permutation in String | ✓ | ✓ | ✓ | Medium |
| 566 | Reshape the Matrix | ✓ | ✓ | ✓ | Easy |
| 565 | Array Nesting | ✓ | ✓ | ✓ | Medium |
| 564 | Find the Closest Palindrome | ✓ | ✓ | ✓ | Hard |
| 563 | Binary Tree Tilt | ✓ | ✓ | ✓ | Easy |
| 562 | | ✓ | ✓ | ✓ | Medium |
| 561 | Array Partition I | ✓ | ✓ | ✓ | Easy |
| 560 | Subarray Sum Equals K | ✓ | ✓ | ✓ | Medium |
| 559 | | ✓ | ✓ | ✓ | Easy |
| 558 | | ✓ | ✓ | ✓ | Easy |
| 557 | Reverse Words in a String III | ✓ | ✓ | ✓ | Easy |
| 556 | Next Greater Element III | ✓ | ✓ | ✓ | Medium |
| 555 | | ✓ | ✓ | ✓ | Medium |
| 554 | Brick Wall | ✓ | ✓ | ✓ | Medium |
| 553 | Optimal Division | ✓ | ✓ | ✓ | Medium |
| 552 | Student Attendance Record II | ✓ | ✓ | ✓ | Hard |
| 551 | Student Attendance Record I | ✓ | ✓ | ✓ | Easy |
| 550 | | ✓ | ✓ | ✓ | Medium |
| 549 | | ✓ | ✓ | ✓ | Medium |
| 548 | | ✓ | ✓ | ✓ | Medium |
| 547 | Friend Circles | ✓ | ✓ | ✓ | Medium |
| 546 | Remove Boxes | ✓ | ✓ | ✓ | Hard |
| 545 | | ✓ | ✓ | ✓ | Medium |
| 544 | | ✓ | ✓ | ✓ | Medium |
| 543 | Diameter of Binary Tree | ✓ | ✓ | ✓ | Easy |
| 542 | 01 Matrix | ✓ | ✓ | ✓ | Medium |
| 541 | Reverse String II | ✓ | ✓ | ✓ | Easy |
| 540 | Single Element in a Sorted Array | ✓ | ✓ | ✓ | Medium |
| 539 | Minimum Time Difference | ✓ | ✓ | ✓ | Medium |
| 538 | Convert BST to Greater Tree | ✓ | ✓ | ✓ | Easy |
| 537 | Complex Number Multiplication | ✓ | ✓ | ✓ | Medium |
| 536 | | ✓ | ✓ | ✓ | Medium |
| 535 | | ✓ | ✓ | ✓ | Medium |
| 534 | | ✓ | ✓ | ✓ | Medium |
| 533 | | ✓ | ✓ | ✓ | Medium |
| 532 | K-diff Pairs in an Array | ✓ | ✓ | ✓ | Easy |
| 531 | | ✓ | ✓ | ✓ | Medium |
| 530 | Minimum Absolute Difference in BST | ✓ | ✓ | ✓ | Easy |
| 529 | Minesweeper | ✓ | ✓ | ✓ | Medium |
| 528 | Random Pick with Weight | ✓ | ✓ | ✓ | Medium |
| 527 | | ✓ | ✓ | ✓ | Hard |
| 526 | Beautiful Arrangement | ✓ | ✓ | ✓ | Medium |
| 525 | Contiguous Array | ✓ | ✓ | ✓ | Medium |
| 524 | Longest Word in Dictionary through Deleting | ✓ | ✓ | ✓ | Medium |
| 523 | Continuous Subarray Sum | ✓ | ✓ | ✓ | Medium |
| 522 | Longest Uncommon Subsequence II | ✓ | ✓ | ✓ | Medium |
| 521 | Longest Uncommon Subsequence I | ✓ | ✓ | ✓ | Easy |
| 520 | Detect Capital | ✓ | ✓ | ✓ | Easy |
| 519 | Random Flip Matrix | ✓ | ✓ | ✓ | Medium |
| 518 | Coin Change 2 | ✓ | ✓ | ✓ | Medium |
| 517 | Super Washing Machines | ✓ | ✓ | ✓ | Hard |
| 516 | Longest Palindromic | ✓ | ✓ | ✓ | Medium |
| 515 | Find Largest Value in Each Tree Row | ✓ | ✓ | ✓ | Medium |
| 514 | Freedom Trail | ✓ | ✓ | ✓ | Hard |
| 513 | Find Bottom Left Tree Value | ✓ | ✓ | ✓ | Medium |
| 512 | | ✓ | ✓ | ✓ | Medium |
| 511 | | ✓ | ✓ | ✓ | Medium |
| 510 | | ✓ | ✓ | ✓ | Medium |
| 509 | Fibonacci Number | ✓ | ✓ | ✓ | Easy |
| 508 | Most Frequent Subtree Sum | ✓ | ✓ | ✓ | Medium |
| 507 | Perfect Number | ✓ | ✓ | ✓ | Easy |
| 506 | Relative Ranks | ✓ | ✓ | ✓ | Easy |
| 505 | | ✓ | ✓ | ✓ | Medium |
| 504 | Base 7 | ✓ | ✓ | ✓ | Easy |
| 503 | Next Greater Element II | ✓ | ✓ | ✓ | Medium |
| 502 | Initial Public Offerings | ✓ | ✓ | ✓ | Hard |
| 501 | Find Mode in Binary Search Tree | ✓ | ✓ | ✓ | Easy |
| 500 | Keyboard Row | ✓ | ✓ | ✓ | Easy |
| 499 | | ✓ | ✓ | ✓ | Hard |
| 498 | Diagonal Traverse | ✓ | ✓ | ✓ | Medium |
| 497 | [Random Point in Non | ✓ | ✓ | ✓ | Medium |
| 496 | Next Greater Element I | ✓ | ✓ | ✓ | Easy |
| 495 | Teemo Attacking | ✓ | ✓ | ✓ | Medium |
| 494 | Target Sum | ✓ | ✓ | ✓ | Medium |
| 493 | Reverse Pairs | ✓ | ✓ | ✓ | Hard |
| 492 | Construct the Rectangle | ✓ | ✓ | ✓ | Easy |
| 491 | Increasing Subsequences | ✓ | ✓ | ✓ | Medium |
| 490 | | ✓ | ✓ | ✓ | Medium |
| 489 | | ✓ | ✓ | ✓ | Hard |
| 488 | Zuma Game | ✓ | ✓ | ✓ | Hard |
| 487 | | ✓ | ✓ | ✓ | Medium |
| 486 | Predict the Winner | ✓ | ✓ | ✓ | Medium |
| 485 | Max Consecutive Ones | ✓ | ✓ | ✓ | Easy |
| 484 | | ✓ | ✓ | ✓ | Medium |
| 483 | Smallest Good Base | ✓ | ✓ | ✓ | Hard |
| 482 | License Key Formatting | ✓ | ✓ | ✓ | Easy |
| 481 | Magical String | ✓ | ✓ | ✓ | Medium |
| 480 | Sliding Window Median | ✓ | ✓ | ✓ | Hard |
| 479 | Largest Palindrome Product | ✓ | ✓ | ✓ | Hard |
| 478 | Generate Random Point in a Circle | ✓ | ✓ | ✓ | Medium |
| 477 | Total Hamming Distance | ✓ | ✓ | ✓ | Medium |
| 476 | Number Complement | ✓ | ✓ | ✓ | Easy |
| 475 | Heaters | ✓ | ✓ | ✓ | Easy |
| 474 | Ones and Zeroes | ✓ | ✓ | ✓ | Medium |
| 473 | Matchsticks to Square | ✓ | ✓ | ✓ | Medium |
| 472 | Concatenated Words | ✓ | ✓ | ✓ | Hard |
| 471 | | ✓ | ✓ | ✓ | Hard |
| 470 | Implement Rand10() Using Rand7() | ✓ | ✓ | ✓ | Medium |
| 469 | | ✓ | ✓ | ✓ | Medium |
| 468 | Validate IP Address | ✓ | ✓ | ✓ | Medium |
| 467 | Unique Substrings in Wraparound String | ✓ | ✓ | ✓ | Medium |
| 466 | Count The Repetitions | ✓ | ✓ | ✓ | Hard |
| 465 | | ✓ | ✓ | ✓ | Hard |
| 464 | Can I Win | ✓ | ✓ | ✓ | Medium |
| 463 | Island Perimeter | ✓ | ✓ | ✓ | Easy |
| 462 | Minimum Moves to Equal Array Elements II | ✓ | ✓ | ✓ | Medium |
| 461 | Hamming Distance | ✓ | ✓ | ✓ | Easy |
| 460 | LFU Cache | ✓ | ✓ | ✓ | Hard |
| 459 | Repeated Substring Pattern | ✓ | ✓ | ✓ | Easy |
| 458 | Poor Pigs | ✓ | ✓ | ✓ | Hard |
| 457 | Circular Array Loop | ✓ | ✓ | ✓ | Medium |
| 456 | 132 Pattern | ✓ | ✓ | ✓ | Medium |
| 455 | Assign Cookies | ✓ | ✓ | ✓ | Easy |
| 454 | 4Sum II | ✓ | ✓ | ✓ | Medium |
| 453 | Minimum Moves to Equal Array Elements | ✓ | ✓ | ✓ | Easy |
| 452 | Minimum Number of Arrows to Burst Balloons | ✓ | ✓ | ✓ | Medium |
| 451 | Sort Characters By Frequency | ✓ | ✓ | ✓ | Medium |
| 450 | Delete Node in a BST | ✓ | ✓ | ✓ | Medium |
| 449 | | ✓ | ✓ | ✓ | Medium |
| 448 | Find All Numbers Disappeared in an Array | ✓ | ✓ | ✓ | Easy |
| 447 | Number of Boomerangs | ✓ | ✓ | ✓ | Easy |
| 446 | Arithmetic Slices II - Subsequence | ✓ | ✓ | ✓ | Hard |
| 445 | Add Two Numbers II | ✓ | ✓ | ✓ | Medium |
| 444 | | ✓ | ✓ | ✓ | Medium |
| 443 | String Compression | ✓ | ✓ | ✓ | Easy |
| 442 | Find All Duplicates in an Array | ✓ | ✓ | ✓ | Medium |
| 441 | Arranging Coins | ✓ | ✓ | ✓ | Easy |
| 440 | K-th Smallest in Lexicographical Order | ✓ | ✓ | ✓ | Hard |
| 439 | | ✓ | ✓ | ✓ | Medium |
| 438 | Find All Anagrams in a String | ✓ | ✓ | ✓ | Easy |
| 437 | Path Sum III | ✓ | ✓ | ✓ | Easy |
| 436 | Find Right Interval | ✓ | ✓ | ✓ | Medium |
| 435 | Non-overlapping Intervals | ✓ | ✓ | ✓ | Medium |
| 434 | Number of Segments in a String | ✓ | ✓ | ✓ | Easy |
| 433 | Minimum Genetic Mutation | ✓ | ✓ | ✓ | Medium |
| 432 | All O`one Data Structure | ✓ | ✓ | ✓ | Hard |
| 431 | | ✓ | ✓ | ✓ | Hard |
| 430 | | ✓ | ✓ | ✓ | Medium |
| 429 | | ✓ | ✓ | ✓ | Easy |
| 428 | | ✓ | ✓ | ✓ | Hard |
| 427 | | ✓ | ✓ | ✓ | Easy |
| 426 | | ✓ | ✓ | ✓ | Medium |
| 425 | | ✓ | ✓ | ✓ | Hard |
| 424 | Longest Repeating Character Replacement | ✓ | ✓ | ✓ | Medium |
| 423 | Reconstruct Original Digits from English | ✓ | ✓ | ✓ | Medium |
| 422 | | ✓ | ✓ | ✓ | Easy |
| 421 | Maximum XOR of Two Numbers in an Array | ✓ | ✓ | ✓ | Medium |
| 420 | Strong Password Checker | ✓ | ✓ | ✓ | Hard |
| 419 | Battleships in a Board | ✓ | ✓ | ✓ | Medium |
| 418 | | ✓ | ✓ | ✓ | Medium |
| 417 | Pacific Atlantic Water Flow | ✓ | ✓ | ✓ | Medium |
| 416 | Partition Equal Subset Sum | ✓ | ✓ | ✓ | Medium |
| 415 | Add Strings | ✓ | ✓ | ✓ | Easy |
| 414 | Third Maximum Number | ✓ | ✓ | ✓ | Easy |
| 413 | Arithmetic Slices | ✓ | ✓ | ✓ | Medium |
| 412 | Fizz Buzz | ✓ | ✓ | ✓ | Easy |
| 411 | | ✓ | ✓ | ✓ | Hard |
| 410 | Split Array Largest Sum | ✓ | ✓ | ✓ | Hard |
| 409 | Longest Palindrome | ✓ | ✓ | ✓ | Easy |
| 408 | | ✓ | ✓ | ✓ | Easy |
| 407 | Trapping Rain Water II | ✓ | ✓ | ✓ | Hard |
| 406 | Queue Reconstruction by Height | ✓ | ✓ | ✓ | Medium |
| 405 | Convert a Number to Hexadecimal | ✓ | ✓ | ✓ | Easy |
| 404 | Sum of Left Leaves | ✓ | ✓ | ✓ | Easy |
| 403 | Frog Jump | ✓ | ✓ | ✓ | Hard |
| 402 | Remove K Digits | ✓ | ✓ | ✓ | Medium |
| 401 | Binary Watch | ✓ | ✓ | ✓ | Easy |
| 400 | Nth Digit | ✓ | ✓ | ✓ | Easy |
| 399 | Evaluate Division | ✓ | ✓ | ✓ | Medium |
| 398 | Random Pick Index | ✓ | ✓ | ✓ | Medium |
| 397 | Integer Replacement | ✓ | ✓ | ✓ | Medium |
| 396 | Rotate Function | ✓ | ✓ | ✓ | Medium |
| 395 | Longest Substring with At Least K Repeating Characters | ✓ | ✓ | ✓ | Medium |
| 394 | Decode String | ✓ | ✓ | ✓ | Medium |
| 393 | UTF-8 Validation | ✓ | ✓ | ✓ | Medium |
| 392 | Is Subsequence | ✓ | ✓ | ✓ | Medium |
| 391 | Perfect Rectangle | ✓ | ✓ | ✓ | Hard |
| 390 | Elimination Game | ✓ | ✓ | ✓ | Medium |
| 389 | Find the Difference | ✓ | ✓ | ✓ | Easy |
| 388 | Longest Absolute File Path | ✓ | ✓ | ✓ | Medium |
| 387 | First Unique Character in a String | ✓ | ✓ | ✓ | Easy |
| 386 | Lexicographical Numbers | ✓ | ✓ | ✓ | Medium |
| 385 | Mini Parser | ✓ | ✓ | ✓ | Medium |
| 384 | Shuffle an Array | ✓ | ✓ | ✓ | Medium |
| 383 | Ransom Note | ✓ | ✓ | ✓ | Easy |
| 382 | Linked List Random Node | ✓ | ✓ | ✓ | Medium |
| 381 | Insert Delete GetRandom O(1) - Duplicates allowed | ✓ | ✓ | ✓ | Hard |
| 380 | Insert Delete GetRandom O(1) | ✓ | ✓ | ✓ | Medium |
| 379 | | ✓ | ✓ | ✓ | Medium |
| 378 | Kth Smallest Element in a Sorted Matrix | ✓ | ✓ | ✓ | Medium |
| 377 | Combination Sum IV | ✓ | ✓ | ✓ | Medium |
| 376 | Wiggle Subsequence | ✓ | ✓ | ✓ | Medium |
| 375 | Guess Number Higher or Lower II | ✓ | ✓ | ✓ | Medium |
| 374 | Guess Number Higher or Lower | ✓ | ✓ | ✓ | Easy |
| 373 | Find K Pairs with Smallest Sums | ✓ | ✓ | ✓ | Medium |
| 372 | Super Pow | ✓ | ✓ | ✓ | Medium |
| 371 | Sum of Two Integers | ✓ | ✓ | ✓ | Easy |
| 370 | | ✓ | ✓ | ✓ | Medium |
| 369 | | ✓ | ✓ | ✓ | Medium |
| 368 | Largest Divisible Subset | ✓ | ✓ | ✓ | Medium |
| 367 | Valid Perfect Square | ✓ | ✓ | ✓ | Easy |
| 366 | | ✓ | ✓ | ✓ | Medium |
| 365 | Water and Jug Problem | ✓ | ✓ | ✓ | Medium |
| 364 | | ✓ | ✓ | ✓ | Medium |
| 363 | Max Sum of Rectangle No Larger Than K | ✓ | ✓ | ✓ | Hard |
| 362 | | ✓ | ✓ | ✓ | Medium |
| 361 | | ✓ | ✓ | ✓ | Medium |
| 360 | | ✓ | ✓ | ✓ | Medium |
| 359 | | ✓ | ✓ | ✓ | Easy |
| 358 | | ✓ | ✓ | ✓ | Hard |
| 357 | Count Numbers with Unique Digits | ✓ | ✓ | ✓ | Medium |
| 356 | | ✓ | ✓ | ✓ | Medium |
| 355 | | ✓ | ✓ | ✓ | Medium |
| 354 | Russian Doll Envelopes | ✓ | ✓ | ✓ | Hard |
| 353 | | ✓ | ✓ | ✓ | Medium |
| 352 | Data Stream as Disjoint Intervals | ✓ | ✓ | ✓ | Hard |
| 351 | Android Unlock Patterns $ | ✓ | ✓ | ✓ | Medium |
| 350 | Intersection of Two Arrays II | ✓ | ✓ | ✓ | Easy |
| 349 | Intersection of Two Arrays | ✓ | ✓ | ✓ | Easy |
| 348 | Design Tic-Tac-Toe $ | ✓ | ✓ | ✓ | Medium |
| 347 | Top K Frequent Elements | ✓ | ✓ | ✓ | Medium |
| 346 | Moving Average from Data Stream $ | ✓ | ✓ | ✓ | Easy |
| 345 | Reverse Vowels of a String | ✓ | ✓ | ✓ | Easy |
| 344 | Reverse String | ✓ | ✓ | ✓ | Easy |
| 343 | Integer Break | ✓ | ✓ | ✓ | Medium |
| 342 | Power of Four | ✓ | ✓ | ✓ | Easy |
| 341 | Flatten Nested List Iterator | ✓ | ✓ | ✓ | Medium |
| 340 | Longest Substring with At Most K Distinct Characters $ | ✓ | ✓ | ✓ | Hard |
| 339 | Nested List Weight Sum $ | ✓ | ✓ | ✓ | Easy |
| 338 | Counting Bits | ✓ | ✓ | ✓ | Medium |
| 337 | House Robber III | ✓ | ✓ | ✓ | Medium |
| 336 | Palindrome Pairs | ✓ | ✓ | ✓ | Hard |
| 335 | Self Crossing | ✓ | ✓ | ✓ | Hard |
| 334 | Increasing Triplet Subsequence | ✓ | ✓ | ✓ | Medium |
| 333 | Largest BST Subtree $ | ✓ | ✓ | ✓ | Medium |
| 332 | Reconstruct Itinerary | ✓ | ✓ | ✓ | Medium |
| 331 | Verify Preorder Serialization of a Binary Tree | ✓ | ✓ | ✓ | Medium |
| 330 | Patching Array | ✓ | ✓ | ✓ | Hard |
| 329 | Longest Increasing Path in a Matrix | ✓ | ✓ | ✓ | Hard |
| 328 | Odd Even Linked List | ✓ | ✓ | ✓ | Medium |
| 327 | Count of Range Sum | ✓ | ✓ | ✓ | Hard |
| 326 | Power of Three | ✓ | ✓ | ✓ | Easy |
| 325 | Maximum Size Subarray Sum Equals k $ | ✓ | ✓ | ✓ | Medium |
| 324 | Wiggle Sort II | ✓ | ✓ | ✓ | Medium |
| 323 | Number of Connected Components in an Undirected Graph $ | ✓ | ✓ | ✓ | Medium |
| 322 | Coin Change | ✓ | ✓ | ✓ | Medium |
| 321 | Create Maximum Number | ✓ | ✓ | ✓ | Hard |
| 320 | Generalized Abbreviation $ | ✓ | ✓ | ✓ | Medium |
| 319 | Bulb Switcher | ✓ | ✓ | ✓ | Medium |
| 318 | Maximum Product of Word Lengths | ✓ | ✓ | ✓ | Medium |
| 317 | Shortest Distance from All Buildings $ | ✓ | ✓ | ✓ | Hard |
| 316 | Remove Duplicate Letters | ✓ | ✓ | ✓ | Hard |
| 315 | Count of Smaller Numbers After Self | ✓ | ✓ | ✓ | Hard |
| 314 | Binary Tree Vertical Order Traversal $ | ✓ | ✓ | ✓ | Medium |
| 313 | Super Ugly Number | ✓ | ✓ | ✓ | Medium |
| 312 | Burst Balloons | ✓ | ✓ | ✓ | Hard |
| 311 | Sparse Matrix Multiplication $ | ✓ | ✓ | ✓ | Medium |
| 310 | Minimum Height Trees | ✓ | ✓ | ✓ | Medium |
| 309 | Best Time to Buy and Sell Stock with Cooldown | ✓ | ✓ | ✓ | Medium |
| 308 | Range Sum Query 2D - Mutable | ✓ | ✓ | ✓ | Hard |
| 307 | Range Sum Query - Mutable | ✓ | ✓ | ✓ | Medium |
| 306 | Additive Number | ✓ | ✓ | ✓ | Medium |
| 305 | Number of Islands II $ | ✓ | ✓ | ✓ | Hard |
| 304 | Range Sum Query 2D - Immutable | ✓ | ✓ | ✓ | Medium |
| 303 | Range Sum Query - Immutable | ✓ | ✓ | ✓ | Easy |
| 302 | Smallest Rectangle Enclosing Black Pixels $ | ✓ | ✓ | ✓ | Hard |
| 301 | Remove Invalid Parentheses | ✓ | ✓ | ✓ | Hard |
| 300 | Longest Increasing Subsequence | ✓ | ✓ | ✓ | Medium |
| 299 | Bulls and Cows | ✓ | ✓ | ✓ | Medium |
| 298 | Binary Tree Longest Consecutive Sequence $ | ✓ | ✓ | ✓ | Medium |
| 297 | Serialize and Deserialize Binary Tree | ✓ | ✓ | ✓ | Hard |
| 296 | Best Meeting Point $ | ✓ | ✓ | ✓ | Hard |
| 295 | Find Median from Data Stream | ✓ | ✓ | ✓ | Hard |
| 294 | Flip Game II $ | ✓ | ✓ | ✓ | Medium |
| 293 | Flip Game $ | ✓ | ✓ | ✓ | Easy |
| 292 | Nim Game | ✓ | ✓ | ✓ | Easy |
| 291 | Word Pattern II $ | ✓ | ✓ | ✓ | Hard |
| 290 | Word Pattern | ✓ | ✓ | ✓ | Easy |
| 289 | Game of Life | ✓ | ✓ | ✓ | Medium |
| 288 | Unique Word Abbreviation $ | ✓ | ✓ | ✓ | Medium |
| 287 | Find the Duplicate Number | ✓ | ✓ | ✓ | Medium |
| 286 | Walls and Gates $ | ✓ | ✓ | ✓ | Medium |
| 285 | Inorder Successor in BST $ | ✓ | ✓ | ✓ | Medium |
| 284 | Peeking Iterator | ✓ | ✓ | ✓ | Medium |
| 283 | Move Zeroes | ✓ | ✓ | ✓ | Easy |
| 282 | Expression Add Operators | ✓ | ✓ | ✓ | Hard |
| 281 | Zigzag Iterator $ | ✓ | ✓ | ✓ | Medium |
| 280 | Wiggle Sort | ✓ | ✓ | ✓ | Medium |
| 279 | Perfect Squares | ✓ | ✓ | ✓ | Medium |
| 278 | First Bad Version | ✓ | ✓ | ✓ | Easy |
| 277 | Find the Celebrity $ | ✓ | ✓ | ✓ | Medium |
| 276 | Paint Fence $ | ✓ | ✓ | ✓ | Easy |
| 275 | H-Index II | ✓ | ✓ | ✓ | Medium |
| 274 | H-Index | ✓ | ✓ | ✓ | Medium |
| 273 | Integer to English Words | ✓ | ✓ | ✓ | Hard |
| 272 | Closest Binary Search Tree Value II $ | ✓ | ✓ | ✓ | Hard |
| 271 | Encode and Decode Strings $ | ✓ | ✓ | ✓ | Medium |
| 270 | Closest Binary Search Tree Value $ | ✓ | ✓ | ✓ | Easy |
| 269 | Alien Dictionary $ | ✓ | ✓ | ✓ | Hard |
| 268 | Missing Number | ✓ | ✓ | ✓ | Easy |
| 267 | Palindrome Permutation II $ | ✓ | ✓ | ✓ | Medium |
| 266 | Palindrome Permutation $ | ✓ | ✓ | ✓ | Easy |
| 265 | Paint House II $ | ✓ | ✓ | ✓ | Hard |
| 264 | Ugly Number II | ✓ | ✓ | ✓ | Medium |
| 263 | Ugly Number | ✓ | ✓ | ✓ | Easy |
| 262 | Trips and Users | ✓ | ✓ | ✓ | Hard |
| 261 | Graph Valid Tree $ | ✓ | ✓ | ✓ | Medium |
| 260 | Single Number III | ✓ | ✓ | ✓ | Medium |
| 259 | 3Sum Smaller $ | ✓ | ✓ | ✓ | Medium |
| 258 | Add Digits | ✓ | ✓ | ✓ | Easy |
| 257 | Binary Tree Paths | ✓ | ✓ | ✓ | Easy |
| 256 | Paint House $ | ✓ | ✓ | ✓ | Easy |
| 255 | Verify Preorder Sequence in Binary Search Tree $ | ✓ | ✓ | ✓ | Medium |
| 254 | Factor Combinations $ | ✓ | ✓ | ✓ | Medium |
| 253 | Meeting Rooms II $ | ✓ | ✓ | ✓ | Medium |
| 252 | Meeting Rooms $ | ✓ | ✓ | ✓ | Easy |
| 251 | Flatten 2D Vector $ | ✓ | ✓ | ✓ | Medium |
| 250 | Count Univalue Subtrees $ | ✓ | ✓ | ✓ | Medium |
| 249 | Group Shifted Strings $ | ✓ | ✓ | ✓ | Medium |
| 248 | Strobogrammatic Number III $ | ✓ | ✓ | ✓ | Hard |
| 247 | Strobogrammatic Number II $ | ✓ | ✓ | ✓ | Medium |
| 246 | Strobogrammatic Number $ | ✓ | ✓ | ✓ | Easy |
| 245 | Shortest Word Distance III $ | ✓ | ✓ | ✓ | Medium |
| 244 | Shortest Word Distance II $ | ✓ | ✓ | ✓ | Medium |
| 243 | Shortest Word Distance $ | ✓ | ✓ | ✓ | Easy |
| 242 | Valid Anagram | ✓ | ✓ | ✓ | Easy |
| 241 | Different Ways to Add Parentheses | ✓ | ✓ | ✓ | Medium |
| 240 | Search a 2D Matrix II | ✓ | ✓ | ✓ | Medium |
| 239 | Sliding Window Maximum | ✓ | ✓ | ✓ | Hard |
| 238 | Product of Array Except Self | ✓ | ✓ | ✓ | Medium |
| 237 | Delete Node in a Linked List | ✓ | ✓ | ✓ | Easy |
| 236 | Lowest Common Ancestor of a Binary Tree | ✓ | ✓ | ✓ | Medium |
| 235 | Lowest Common Ancestor of a Binary Search Tree | ✓ | ✓ | ✓ | Easy |
| 234 | Palindrome Linked List | ✓ | ✓ | ✓ | Easy |
| 233 | Number of Digit One | ✓ | ✓ | ✓ | Hard |
| 232 | Implement Queue using Stacks | ✓ | ✓ | ✓ | Easy |
| 231 | Power of Two | ✓ | ✓ | ✓ | Easy |
| 230 | Kth Smallest Element in a BST | ✓ | ✓ | ✓ | Medium |
| 229 | Majority Element II | ✓ | ✓ | ✓ | Medium |
| 228 | Summary Ranges | ✓ | ✓ | ✓ | Medium |
| 227 | Basic Calculator II | ✓ | ✓ | ✓ | Medium |
| 226 | Invert Binary Tree | ✓ | ✓ | ✓ | Easy |
| 225 | Implement Stack using Queues | ✓ | ✓ | ✓ | Easy |
| 224 | Basic Calculator | ✓ | ✓ | ✓ | Hard |
| 223 | Rectangle Area | ✓ | ✓ | ✓ | Medium |
| 222 | Count Complete Tree Nodes | ✓ | ✓ | ✓ | Medium |
| 221 | Maximal Square | ✓ | ✓ | ✓ | Medium |
| 220 | Contains Duplicate III | ✓ | ✓ | ✓ | Medium |
| 219 | Contains Duplicate II | ✓ | ✓ | ✓ | Easy |
| 218 | The Skyline Problem | ✓ | ✓ | ✓ | Hard |
| 217 | Contains Duplicate | ✓ | ✓ | ✓ | Easy |
| 216 | Combination Sum III | ✓ | ✓ | ✓ | Medium |
| 215 | Kth Largest Element in an Array | ✓ | ✓ | ✓ | Medium |
| 214 | Shortest Palindrome | ✓ | ✓ | ✓ | Hard |
| 213 | House Robber II | ✓ | ✓ | ✓ | Medium |
| 212 | Word Search II | ✓ | ✓ | ✓ | Hard |
| 211 | Add and Search Word - Data structure design | ✓ | ✓ | ✓ | Medium |
| 210 | Course Schedule II | ✓ | ✓ | ✓ | Medium |
| 209 | Minimum Size Subarray Sum | ✓ | ✓ | ✓ | Medium |
| 208 | Implement Trie (Prefix Tree) | ✓ | ✓ | ✓ | Medium |
| 207 | Course Schedule | ✓ | ✓ | ✓ | Medium |
| 206 | Reverse Linked List | ✓ | ✓ | ✓ | Easy |
| 205 | Isomorphic Strings | ✓ | ✓ | ✓ | Easy |
| 204 | Count Primes | ✓ | ✓ | ✓ | Easy |
| 203 | Remove Linked List Elements | ✓ | ✓ | ✓ | Easy |
| 202 | Happy Number | ✓ | ✓ | ✓ | Easy |
| 201 | Bitwise AND of Numbers Range | ✓ | ✓ | ✓ | Medium |
| 200 | Number of Islands | ✓ | ✓ | ✓ | Medium |
| 199 | Binary Tree Right Side View | ✓ | ✓ | ✓ | Medium |
| 198 | House Robber | ✓ | ✓ | ✓ | Easy |
| 197 | Rising Temperature | ✓ | ✓ | ✓ | Easy |
| 196 | Delete Duplicate Emails | ✓ | ✓ | ✓ | Easy |
| 195 | Tenth Line | ✓ | ✓ | ✓ | Easy |
| 194 | Transpose File | ✓ | ✓ | ✓ | Medium |
| 193 | Valid Phone Numbers | ✓ | ✓ | ✓ | Easy |
| 192 | Word Frequency | ✓ | ✓ | ✓ | Medium |
| 191 | Number of 1 Bits | ✓ | ✓ | ✓ | Easy |
| 190 | Reverse Bits | ✓ | ✓ | ✓ | Easy |
| 189 | Rotate Array | ✓ | ✓ | ✓ | Easy |
| 188 | Best Time to Buy and Sell Stock IV | ✓ | ✓ | ✓ | Hard |
| 187 | Repeated DNA Sequences | ✓ | ✓ | ✓ | Medium |
| 186 | Reverse Words in a String II $ | ✓ | ✓ | ✓ | Medium |
| 185 | Department Top Three Salaries | ✓ | ✓ | ✓ | Hard |
| 184 | Department Highest Salary | ✓ | ✓ | ✓ | Medium |
| 183 | Customers Who Never Order | ✓ | ✓ | ✓ | Easy |
| 182 | Duplicate Emails | ✓ | ✓ | ✓ | Easy |
| 181 | Employees Earning More Than Their Managers | ✓ | ✓ | ✓ | Easy |
| 180 | Consecutive Numbers | ✓ | ✓ | ✓ | Medium |
| 179 | Largest Number | ✓ | ✓ | ✓ | Medium |
| 178 | Rank Scores | ✓ | ✓ | ✓ | Medium |
| 177 | Nth Highest Salary | ✓ | ✓ | ✓ | Medium |
| 176 | Second Highest Salary | ✓ | ✓ | ✓ | Easy |
| 175 | Combine Two Tables | ✓ | ✓ | ✓ | Easy |
| 174 | Dungeon Game | ✓ | ✓ | ✓ | Hard |
| 173 | Binary Search Tree Iterator | ✓ | ✓ | ✓ | Medium |
| 172 | Factorial Trailing Zeroes | ✓ | ✓ | ✓ | Easy |
| 171 | Excel Sheet Column Number | ✓ | ✓ | ✓ | Easy |
| 170 | Two Sum III - Data structure design $ | ✓ | ✓ | ✓ | Easy |
| 169 | Majority Element | ✓ | ✓ | ✓ | Easy |
| 168 | Excel Sheet Column Title | ✓ | ✓ | ✓ | Easy |
| 167 | Two Sum II - Input array is sorted | ✓ | ✓ | ✓ | Easy |
| 166 | Fraction to Recurring Decimal | ✓ | ✓ | ✓ | Medium |
| 165 | Compare Version Numbers | ✓ | ✓ | ✓ | Medium |
| 164 | Maximum Gap | ✓ | ✓ | ✓ | Hard |
| 163 | Missing Ranges $ | ✓ | ✓ | ✓ | Medium |
| 162 | Find Peak Element | ✓ | ✓ | ✓ | Medium |
| 161 | One Edit Distance $ | ✓ | ✓ | ✓ | Medium |
| 160 | Intersection of Two Linked Lists | ✓ | ✓ | ✓ | Easy |
| 159 | Longest Substring with At Most Two Distinct Characters $ | ✓ | ✓ | ✓ | Hard |
| 158 | Read N Characters Given Read4 II $ | ✓ | ✓ | ✓ | Hard |
| 157 | Read N Characters Given Read4 $ | ✓ | ✓ | ✓ | Easy |
| 156 | Binary Tree Upside Down $ | ✓ | ✓ | ✓ | Medium |
| 155 | Min Stack | ✓ | ✓ | ✓ | Easy |
| 154 | Find Minimum in Rotated Sorted Array II | ✓ | ✓ | ✓ | Hard |
| 153 | Find Minimum in Rotated Sorted Array | ✓ | ✓ | ✓ | Medium |
| 152 | Maximum Product Subarray | ✓ | ✓ | ✓ | Medium |
| 151 | Reverse Words in a String | ✓ | ✓ | ✓ | Medium |
| 150 | Evaluate Reverse Polish Notation | ✓ | ✓ | ✓ | Medium |
| 149 | Max Points on a Line | ✓ | ✓ | ✓ | Hard |
| 148 | Sort List | ✓ | ✓ | ✓ | Medium |
| 147 | Insertion Sort List | ✓ | ✓ | ✓ | Medium |
| 146 | LRU Cache | ✓ | ✓ | ✓ | Hard |
| 145 | Binary Tree Postorder Traversal | ✓ | ✓ | ✓ | Hard |
| 144 | Binary Tree Preorder Traversal | ✓ | ✓ | ✓ | Medium |
| 143 | Reorder List | ✓ | ✓ | ✓ | Medium |
| 142 | Linked List Cycle II | ✓ | ✓ | ✓ | Medium |
| 141 | Linked List Cycle | ✓ | ✓ | ✓ | Easy |
| 140 | Word Break II | ✓ | ✓ | ✓ | Hard |
| 139 | Word Break | ✓ | ✓ | ✓ | Medium |
| 138 | Copy List with Random Pointer | ✓ | ✓ | ✓ | Medium |
| 137 | Single Number II | ✓ | ✓ | ✓ | Medium |
| 136 | Single Number | ✓ | ✓ | ✓ | Easy |
| 135 | Candy | ✓ | ✓ | ✓ | Hard |
| 134 | Gas Station | ✓ | ✓ | ✓ | Medium |
| 133 | Clone Graph | ✓ | ✓ | ✓ | Medium |
| 132 | Palindrome Partitioning II | ✓ | ✓ | ✓ | Hard |
| 131 | Palindrome Partitioning | ✓ | ✓ | ✓ | Medium |
| 130 | Surrounded Regions | ✓ | ✓ | ✓ | Medium |
| 129 | Sum Root to Leaf Numbers | ✓ | ✓ | ✓ | Medium |
| 128 | Longest Consecutive Sequence | ✓ | ✓ | ✓ | Hard |
| 127 | Word Ladder | ✓ | ✓ | ✓ | Medium |
| 126 | Word Ladder II | ✓ | ✓ | ✓ | Hard |
| 125 | Valid Palindrome | ✓ | ✓ | ✓ | Easy |
| 124 | Binary Tree Maximum Path Sum | ✓ | ✓ | ✓ | Hard |
| 123 | Best Time to Buy and Sell Stock III | ✓ | ✓ | ✓ | Hard |
| 122 | Best Time to Buy and Sell Stock II | ✓ | ✓ | ✓ | Easy |
| 121 | Best Time to Buy and Sell Stock | ✓ | ✓ | ✓ | Easy |
| 120 | Triangle | ✓ | ✓ | ✓ | Medium |
| 119 | Pascal's Triangle II | ✓ | ✓ | ✓ | Easy |
| 118 | Pascal's Triangle | ✓ | ✓ | ✓ | Easy |
| 117 | Populating Next Right Pointers in Each Node II | ✓ | ✓ | ✓ | Medium |
| 116 | Populating Next Right Pointers in Each Node | ✓ | ✓ | ✓ | Medium |
| 115 | Distinct Subsequences | ✓ | ✓ | ✓ | Hard |
| 114 | Flatten Binary Tree to Linked List | ✓ | ✓ | ✓ | Medium |
| 113 | Path Sum II | ✓ | ✓ | ✓ | Medium |
| 112 | Path Sum | ✓ | ✓ | ✓ | Easy |
| 111 | Minimum Depth of Binary Tree | ✓ | ✓ | ✓ | Easy |
| 110 | Balanced Binary Tree | ✓ | ✓ | ✓ | Easy |
| 109 | Convert Sorted List to Binary Search Tree | ✓ | ✓ | ✓ | Medium |
| 108 | Convert Sorted Array to Binary Search Tree | ✓ | ✓ | ✓ | Easy |
| 107 | Binary Tree Level Order Traversal II | ✓ | ✓ | ✓ | Easy |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | ✓ | ✓ | ✓ | Medium |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | ✓ | ✓ | ✓ | Medium |
| 104 | Maximum Depth of Binary Tree | ✓ | ✓ | ✓ | Easy |
| 103 | Binary Tree Zigzag Level Order Traversal | ✓ | ✓ | ✓ | Medium |
| 102 | Binary Tree Level Order Traversal | ✓ | ✓ | ✓ | Medium |
| 101 | Symmetric Tree | ✓ | ✓ | ✓ | Easy |
| 100 | Same Tree | ✓ | ✓ | ✓ | Hard |
| 99 | Recover Binary Search Tree | ✓ | ✓ | ✓ | Medium |
| 98 | Validate Binary Search Tree | ✓ | ✓ | ✓ | Medium |
| 97 | Interleaving String | ✓ | ✓ | ✓ | Medium |
| 96 | Unique Binary Search Trees | ✓ | ✓ | ✓ | Medium |
| 95 | Unique Binary Search Trees II | ✓ | ✓ | ✓ | Medium |
| 94 | Binary Tree Inorder Traversal | ✓ | ✓ | ✓ | Medium |
| 93 | Restore IP Addresses | ✓ | ✓ | ✓ | Medium |
| 92 | Reverse Linked List II | ✓ | ✓ | ✓ | Medium |
| 91 | Decode Ways | ✓ | ✓ | ✓ | Medium |
| 90 | Subsets II | ✓ | ✓ | ✓ | Medium |
| 89 | Gray Code | ✓ | ✓ | ✓ | Medium |
| 88 | Merge Sorted Array | ✓ | ✓ | ✓ | Easy |
| 87 | Scramble String | ✓ | ✓ | ✓ | Hard |
| 86 | Partition List | ✓ | ✓ | ✓ | Medium |
| 85 | Maximal Rectangle | ✓ | ✓ | ✓ | Hard |
| 84 | Largest Rectangle in Histogram | ✓ | ✓ | ✓ | Hard |
| 83 | Remove Duplicates from Sorted List | ✓ | ✓ | ✓ | Easy |
| 82 | Remove Duplicates from Sorted List II | ✓ | ✓ | ✓ | Medium |
| 81 | Search in Rotated Sorted Array II | ✓ | ✓ | ✓ | Medium |
| 80 | Remove Duplicates from Sorted Array II | ✓ | ✓ | ✓ | Medium |
| 79 | Word Search | ✓ | ✓ | ✓ | Medium |
| 78 | Subsets | ✓ | ✓ | ✓ | Medium |
| 77 | Combinations | ✓ | ✓ | ✓ | Medium |
| 76 | Minimum Window Substring | ✓ | ✓ | ✓ | Hard |
| 75 | Sort Colors | ✓ | ✓ | ✓ | Medium |
| 74 | Search a 2D Matrix | ✓ | ✓ | ✓ | Medium |
| 73 | Set Matrix Zeroes | ✓ | ✓ | ✓ | Medium |
| 72 | Edit Distance | ✓ | ✓ | ✓ | Hard |
| 71 | Simplify Path | ✓ | ✓ | ✓ | Medium |
| 70 | Climbing Stairs | ✓ | ✓ | ✓ | Easy |
| 69 | Sqrt(x) | ✓ | ✓ | ✓ | Easy |
| 68 | Text Justification | ✓ | ✓ | ✓ | Hard |
| 67 | Add Binary | ✓ | ✓ | ✓ | Easy |
| 66 | Plus One | ✓ | ✓ | ✓ | Easy |
| 65 | Valid Number | ✓ | ✓ | ✓ | Hard |
| 64 | Minimum Path Sum | ✓ | ✓ | ✓ | Medium |
| 63 | Unique Paths II | ✓ | ✓ | ✓ | Medium |
| 62 | Unique Paths | ✓ | ✓ | ✓ | Medium |
| 61 | Rotate List | ✓ | ✓ | ✓ | Medium |
| 60 | Permutation Sequence | ✓ | ✓ | ✓ | Medium |
| 59 | Spiral Matrix II | ✓ | ✓ | ✓ | Medium |
| 58 | Length of Last Word | ✓ | ✓ | ✓ | Easy |
| 57 | Insert Interval | ✓ | ✓ | ✓ | Hard |
| 56 | Merge Intervals | ✓ | ✓ | ✓ | Medium |
| 55 | Jump Game | ✓ | ✓ | ✓ | Medium |
| 54 | Spiral Matrix | ✓ | ✓ | ✓ | Medium |
| 53 | Maximum Subarray | ✓ | ✓ | ✓ | Easy |
| 52 | N-Queens II | ✓ | ✓ | ✓ | Hard |
| 51 | N-Queens | ✓ | ✓ | ✓ | Hard |
| 50 | Pow(x, n) | ✓ | ✓ | ✓ | Medium |
| 49 | Group Anagrams | ✓ | ✓ | ✓ | Medium |
| 48 | Rotate Image | ✓ | ✓ | ✓ | Medium |
| 47 | Permutations II | ✓ | ✓ | ✓ | Medium |
| 46 | Permutations | ✓ | ✓ | ✓ | Medium |
| 45 | Jump Game II | ✓ | ✓ | ✓ | Hard |
| 44 | Wildcard Matching | ✓ | ✓ | ✓ | Hard |
| 43 | Multiply Strings | ✓ | ✓ | ✓ | Medium |
| 42 | Trapping Rain Water | ✓ | ✓ | ✓ | Hard |
| 41 | First Missing Positive | ✓ | ✓ | ✓ | Hard |
| 40 | Combination Sum II | ✓ | ✓ | ✓ | Medium |
| 39 | Combination Sum | ✓ | ✓ | ✓ | Medium |
| 38 | Count and Say | ✓ | ✓ | ✓ | Easy |
| 37 | Sudoku Solver | ✓ | ✓ | ✓ | Hard |
| 36 | Valid Sudoku | ✓ | ✓ | ✓ | Medium |
| 35 | Search Insert Position | ✓ | ✓ | ✓ | Easy |
| 34 | Find First and Last Position of Element in Sorted Array | ✓ | ✓ | ✓ | Medium |
| 33 | Search in Rotated Sorted Array | ✓ | ✓ | ✓ | Medium |
| 32 | Longest Valid Parentheses | ✓ | ✓ | ✓ | Hard |
| 31 | Next Permutation | ✓ | ✓ | ✓ | Medium |
| 30 | Substring with Concatenation of All Words | ✓ | ✓ | ✓ | Hard |
| 29 | Divide Two Integers | ✓ | ✓ | ✓ | Medium |
| 28 | Implement strStr() | ✓ | ✓ | ✓ | Easy |
| 27 | Remove Element | ✓ | ✓ | ✓ | Easy |
| 26 | Remove Duplicates from Sorted Array | ✓ | ✓ | ✓ | Easy |
| 25 | Reverse Nodes in k-Group | ✓ | ✓ | ✓ | Hard |
| 24 | Swap Nodes in Pairs | ✓ | ✓ | ✓ | Medium |
| 23 | Merge k Sorted Lists | ✓ | ✓ | ✓ | Hard |
| 22 | Generate Parentheses | ✓ | ✓ | ✓ | Medium |
| 21 | Merge Two Sorted Lists | ✓ | ✓ | ✓ | Easy |
| 20 | Valid Parentheses | ✓ | ✓ | ✓ | Easy |
| 19 | Remove Nth Node From End of List | ✓ | ✓ | ✓ | Medium |
| 18 | 4Sum | ✓ | ✓ | ✓ | Medium |
| 17 | Letter Combinations of a Phone Number | ✓ | ✓ | ✓ | Medium |
| 16 | 3Sum Closest | ✓ | ✓ | ✓ | Medium |
| 15 | 3Sum | ✓ | ✓ | ✓ | Medium |
| 14 | Longest Common Prefix | ✓ | ✓ | ✓ | Easy |
| 13 | Roman to Integer | ✓ | ✓ | ✓ | Easy |
| 12 | Integer to Roman | ✓ | ✓ | ✓ | Medium |
| 11 | Container With Most Water | ✓ | ✓ | ✓ | Medium |
| 10 | Regular Expression Matching | ✓ | ✓ | ✓ | Hard |
| 9 | Palindrome Number | ✓ | ✓ | ✓ | Easy |
| 8 | String to Integer (atoi) | ✓ | ✓ | ✓ | Medium |
| 7 | Reverse Integer | ✓ | ✓ | ✓ | Easy |
| 6 | ZigZag Conversion | ✓ | ✓ | ✓ | Medium |
| 5 | Longest Palindromic Substring | ✓ | ✓ | ✓ | Medium |
| 4 | Median of Two Sorted Arrays | ✓ | ✓ | ✓ | Hard |
| 3 | Longest Substring Without Repeating Characters | ✓ | ✓ | ✓ | Medium |
| 2 | Add Two Numbers | ✓ | ✓ | ✓ | Medium |
| 1 | Two Sum | ✓ | ✓ | ✓ | Easy |
Welcome to participate in the project！→ Course
License
This is under an MIT license. See the LICENSE for more information.