My implementation of some popular data structures and algorithms and interview questions relating to them in Python 3 and C++

Contains some popular questions based on *bit manipulations*.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Check whether a given number n is a power of 2 or 0 | py | cpp |

Count number of bits needed to be flipped to convert A to B | py | cpp |

Find the two non-repeating elements in an array of repeating elements | py | cpp |

Find the next greater and next smaller number with same number of set bits | py | cpp |

Contains some popular questions based on *dynamic programming approach*.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

0-1 Knapsack Problem | py | - |

Cutting Rod problem | py | - |

minimum number of edits (operations) required to convert â€˜str1â€™ into â€˜str2â€™ | py | - |

Given a 2-D matrix of 0s and 1s, find the Largest Square which contains all 1s in itself | py | - |

Given two sequences, print the longest subsequence present in both of them. | py | - |

Length of the longest subsequence in an array such that all elements of the subsequence are sorted in increasing order | py | - |

Find minimum cost path in a matrix from (0,0) to given point (m,n) | py | - |

Partition a set into two subsets such that the difference of subset sums is minimum | py | - |

Minimum number of umbrellas of m different sizes required to accomodate N people | py | cpp |

Determine if there is a subset of the given set with sum equal to given sum | py | - |

Maximum Subarray Problem | py | - |

Given a distance â€˜dist, count total number of ways to cover the distance with 1, 2 and 3 steps | py | - |

Contains implementation of Graph data structure and some common questions and algorithms related to it.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Find all possible words in a board of characters | py | - |

Breadth First Search Traversal | py | - |

Depth First Search Traversal | py | - |

Detect Cycle in directed graph | py | - |

Detect cycle in undirected graph | py | - |

Dijkstraâ€™s Shortest Path Algorithm | py | - |

Find shortest distances between each pair of vertices in a given edge weighted directed Graph | py | - |

Graph implementation | py | - |

Kruskal's Algorithm for Minimum Spanning Tree | py | - |

Topological Sort | py | - |

Contains implementation of Heap data structure and some common questions and algorithms related to it.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Heap Sort algorithm | py | - |

Max Heap implementation | py | - |

Min Heap implementation | py | - |

Find the median for an incoming stream of numbers after each insertion in the list of numbers | py | - |

Contains implementation of Linked List data structure and some common questions and algorithms related to it.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Clone a linked list with next and random pointer | py | - |

Given a linked list of line segments, remove middle points if any | py | - |

Construct a Maximum Sum Linked List out of two Sorted Linked Lists having some Common nodes. | py | - |

Merge a linked list into another linked list at alternate positions | py | - |

Perform Merge Sort | py | - |

Find Middle Node | py | cpp |

Point to next higher value node in a linked list with an arbitrary pointer | py | - |

Find if linked list contains any cycle | py | - |

To select a random node in a singly linked list | py | - |

Find and remove cycle if any | py | cpp |

Reverse sub list of K nodes each | py | cpp |

Reverse alternate sub list of K nodes each | py | cpp |

Reverse a linked list | py | cpp |

Bring even valued nodes to the front | py | - |

Implementation of Singly Linked List | py | cpp |

Skip M nodes and then delete N nodes alternately | py | cpp |

Contains implementation of some common questions and algorithms related to Mathematics.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Fine the number of trailing zeros in factorial of a number | py | cpp |

Find the greatest common divisor of 2 numbers | py | - |

print all prime factors of a given number | py | - |

Sieve of Eratosthenes (find prime numbers up to n efficiently) | py | - |

Contains some common algorithms and questions based on *Matrix*.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Given the Coordinates of King and Queen on a chessboard, check if queen threatens the king | py | - |

Search in a row wise and column wise sorted matrix | py | - |

Given a 2D array, print it in spiral form | py | - |

Contains some miscellaneous questions and algorithms.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Given a dictionary, write a function to flatten it | py | - |

Contains some common questions and algorithms related to strings or 1-d arrays.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Find the longest substring with k unique characters in a given string | py | - |

Find a pattern in a string using KMP search algorithm | py | - |

Find the Kth smallest element in the array | py | - |

Find a pair in an array with sum x | py | - |

Print all valid (properly opened and closed) combinations of n pairs of parentheses | py | - |

reverse the order of the words in the array | py | - |

Find index of given number in a sorted array shifted by an unknown offset | py | - |

Print all permutations of a given string | py | - |

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Linear Search in an array | py | - |

Binary Search in an array | py | - |

Interpolation Search in an array | py | - |

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Bubble sort Algorithm | py | - |

Counting sort Algorithm (non-comparision based sorting) | py | - |

Insertion sort Algorithm | py | - |

Sort an array where each element is at most k places away from its sorted position | py | - |

Merge Sort Algorithm | py | - |

Quick Sort Algorithm using last element as pivot | py | - |

Selection sort Algorithm | py | - |

Contains implementation of Tree data structure and some common questions and algorithms related to it.

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Binary Search Tree implementation | py | - |

Check if a given array can represent Preorder Traversal of Binary Search Tree | py | - |

Find the in-order ancestor of a given node in BST | py | - |

Find the Lowest Common Ancestor | py | - |

Given a sorted array, create a BST with minimal height | py | - |

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Print Nodes in Bottom View of Binary Tree | py | - |

Check if a binary tree is height balanced | py | - |

Check whether a binary tree is a full binary tree or not | py | - |

Given two binary trees, check if the first tree is subtree of the second one | py | - |

Find the Lowest Common Ancestor in a Binary Tree | py | - |

Create a list of all nodes at each depth | py | - |

Find the maximum path sum i.e. max sum of a path in a binary tree | py | - |

Find minimum depth of a binary tree | py | - |

Remove nodes on root to leaf paths of length < K | py | - |

Given a Perfect Binary Tree, reverse the alternate level nodes of the tree | py | - |

Print Nodes in Top View of Binary Tree | py | - |

Topic/Question | Code in Python | Code in C++ |
---|---|---|

Implementation of Trie data structure | py | - |

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