Data Structure & Algorithms Problems List

This is a curated list of all the important data structure & algorithms problems
asked during interviews by top companies

Data Structures & Algorithms Problems

• Search an array where adjacent differ by at most k 
• Maximum product subarray 
• 3 Sum 
• Pair with given sum in rotated array 
• Top k frequent elements 
• Delete given node from linked list without head 
• Longest Palindromic Substring 
• Spiral Matrix 
• Remove duplicates from an unsorted singly linked list 
• Permute Two Arrays such that Sum of Every Pair is Greater or Equal to K 
• Rotate Image 
• Sort a Linked List with 0s 1s and 2s 
• Word Search Grid Traversal 
• Common Element in all Rows of a Given Row-Wise Sorted Matrix 
• Remove nth node from the end of Linked List 
• Counting Sort 
• Container with most water 
• Reorder List 
• Longest Repeating Character Replacement 
• Intersection point of two linked lists 
• Find the no of islands in a 2D Array/Matrix 
• Majority Frequency Element 
• Longest subarray with sum divisible by k 
• Best Time to Buy and Sell Stock 
• Make array elements equal with minimum cost 
• Product of array except self 
• Group Anagrams 
• Remove consecutive characters from a string expression 
• Count triplets with sum less than given value 
• Count Palindromic Substrings 
• Next Permutation 
• Count the number of palindromic subsequences 
• Set Matrix Zero 
• Check for balanced brackets or valid parenthesis in an expression 
• Longest Substring Without Repeating Characters 