Coding Interview Questions

Problem Statement: You are given an array of intervals [start, end]. You need to return minimum number of intervals to remove to make the rest…

Problem Statement: You are given 2 strings s, t. You need to check if s is a substring of t. A substring of a string is a new string that is…

Problem Statement: You are given an array of arrival and departure timings for train at a station. You need to find the minimum umber of…

Problem Statement: You are given a number and integer k. You need to remove k digits from the number and it should return the smallest integer…

Problem Statement: You are given sorted array, and an integer K. You need to add elements in such a way that any number in the range [1, k]…

Problem Statement: You are given a string s, you need to remove duplicate letters so that every letter should appear only once. The result…

Problem Statement: You are given a root of a binary tree. You need to flatten into a sorted list. Solution We need to do inorder traversal.…

Problem Statement: You are given a root node of a binary search tree where 2 nodes are swapped. You need to correct the BST and return it.…

Problem Statement: You are given a root node of a BST. You need to check if it has a dead end or not. A dead end is a node, where you will not…

Problem Statement: You are given an array of integers in pre-order fashion. Then you need to check if it is a valid BST. Solution pre-order…