Top 200+ Coding Questions for MNC Interviews
A curated list of frequently asked Data Structures and Algorithms (DSA) and logic-building questions in top MNCs (TCS, Infosys, Wipro, Cognizant, Accenture, IBM, etc.).
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- 1Two Sum
- 2Best Time to Buy and Sell Stock
- 3Contains Duplicate
- 4Product of Array Except Self
- 5Maximum Subarray
- 6Maximum Product Subarray
- 7Find Minimum in Rotated Sorted Array
- 8Search in Rotated Sorted Array
- 93Sum
- 10Container With Most Water
- 11Move Zeroes
- 12Remove Duplicates from Sorted Array
- 13Merge Sorted Array
- 14Sort Colors (Dutch National Flag)
- 15Find Peak Element
- 16Majority Element
- 17Rotate Array
- 18Missing Number
- 19Find All Numbers Disappeared in an Array
- 20Single Number
- 21Intersection of Two Arrays
- 22Intersection of Two Arrays II
- 23Next Permutation
- 24Pascal's Triangle
- 25Pascal's Triangle II
- 26Set Matrix Zeroes
- 27Spiral Matrix
- 28Rotate Image
- 29First Missing Positive
- 30Longest Consecutive Sequence
- 31Kth Largest Element in an Array
- 32Subarray Sum Equals K
- 33Find the Duplicate Number
- 34Trapping Rain Water
- 35Sliding Window Maximum
- 36Valid Palindrome
- 37Longest Substring Without Repeating Characters
- 38Longest Repeating Character Replacement
- 39Valid Parentheses
- 40Longest Palindromic Substring
- 41Palindromic Substrings
- 42Encode and Decode Strings
- 43Group Anagrams
- 44Find All Anagrams in a String
- 45Minimum Window Substring
- 46Reverse String
- 47Reverse Vowels of a String
- 48Reverse Words in a String
- 49String to Integer (atoi)
- 50Implement strStr()
- 51Longest Common Prefix
- 52Valid Anagram
- 53Isomorphic Strings
- 54Word Pattern
- 55Check If Two String Arrays are Equivalent
- 56Count and Say
- 57Multiply Strings
- 58Add Strings
- 59Add Binary
- 60Roman to Integer
- 61Integer to Roman
- 62Minimum Add to Make Parentheses Valid
- 63Generate Parentheses
- 64Decode String
- 65Longest Valid Parentheses
- 66Edit Distance
- 67Regular Expression Matching
- 68Wildcard Matching
- 69Distinct Subsequences
- 70Find the Index of the First Occurrence in a String
- 71Reverse Linked List
- 72Merge Two Sorted Lists
- 73Reorder List
- 74Remove Nth Node From End of List
- 75Copy List with Random Pointer
- 76Add Two Numbers
- 77Linked List Cycle
- 78Linked List Cycle II
- 79Find the Duplicate Number (LL variation)
- 80Merge k Sorted Lists
- 81Reverse Nodes in k-Group
- 82Palindrome Linked List
- 83Intersection of Two Linked Lists
- 84Middle of the Linked List
- 85Delete Node in a Linked List
- 86Remove Linked List Elements
- 87Odd Even Linked List
- 88Sort List
- 89Partition List
- 90Rotate List
- 91Swap Nodes in Pairs
- 92Reverse Linked List II
- 93Flatten a Multilevel Doubly Linked List
- 94LRU Cache
- 95LFU Cache
- 96Implement Queue using Stacks
- 97Implement Stack using Queues
- 98Min Stack
- 99Evaluate Reverse Polish Notation
- 100Daily Temperatures
- 101Next Greater Element I
- 102Next Greater Element II
- 103Largest Rectangle in Histogram
- 104Maximal Rectangle
- 105Sliding Window Maximum
- 106Stock Spanner
- 107Online Stock Span
- 108Remove K Digits
- 109132 Pattern
- 110Design Circular Queue
- 111Maximum Depth of Binary Tree
- 112Same Tree
- 113Invert Binary Tree
- 114Binary Tree Maximum Path Sum
- 115Binary Tree Level Order Traversal
- 116Serialize and Deserialize Binary Tree
- 117Subtree of Another Tree
- 118Construct Binary Tree from Preorder and Inorder Traversal
- 119Validate Binary Search Tree
- 120Kth Smallest Element in a BST
- 121Lowest Common Ancestor of a BST
- 122Lowest Common Ancestor of a Binary Tree
- 123Implement Trie (Prefix Tree)
- 124Design Add and Search Words Data Structure
- 125Word Search II
- 126Binary Tree Right Side View
- 127Binary Tree Zigzag Level Order Traversal
- 128Balanced Binary Tree
- 129Minimum Depth of Binary Tree
- 130Path Sum
- 131Path Sum II
- 132Path Sum III
- 133Diameter of Binary Tree
- 134Merge Two Binary Trees
- 135Symmetric Tree
- 136Convert Sorted Array to Binary Search Tree
- 137Flatten Binary Tree to Linked List
- 138Populating Next Right Pointers in Each Node
- 139Binary Search Tree Iterator
- 140Insert into a Binary Search Tree
- 141Delete Node in a BST
- 142All Nodes Distance K in Binary Tree
- 143Binary Tree Maximum Path Sum
- 144Count Complete Tree Nodes
- 145Serialize and Deserialize BST
- 146Number of Islands
- 147Clone Graph
- 148Max Area of Island
- 149Pacific Atlantic Water Flow
- 150Surrounded Regions
- 151Rotting Oranges
- 152Walls and Gates
- 153Course Schedule
- 154Course Schedule II
- 155Redundant Connection
- 156Number of Connected Components in an Undirected Graph
- 157Graph Valid Tree
- 158Word Ladder
- 159Minimum Height Trees
- 160Is Graph Bipartite?
- 161Network Delay Time
- 162Cheapest Flights Within K Stops
- 163Evaluate Division
- 164Find Eventual Safe States
- 165Alien Dictionary
- 166Reconstruct Itinerary
- 167Min Cost to Connect All Points
- 168Swim in Rising Water
- 169Number of Provinces
- 170Word Search
- 171Climbing Stairs
- 172Min Cost Climbing Stairs
- 173House Robber
- 174House Robber II
- 175Decode Ways
- 176Coin Change
- 177Maximum Product Subarray
- 178Word Break
- 179Longest Increasing Subsequence
- 180Partition Equal Subset Sum
- 181Unique Paths
- 182Unique Paths II
- 183Minimum Path Sum
- 184Edit Distance
- 185Burst Balloons
- 186Longest Common Subsequence
- 187Target Sum
- 188Interleaving String
- 189Maximum Alternating Subsequence Sum
- 190Distinct Subsequences
- 191Best Time to Buy and Sell Stock with Cooldown
- 192Best Time to Buy and Sell Stock IV
- 193Binary Search
- 194Search Insert Position
- 195Find First and Last Position of Element in Sorted Array
- 196Search a 2D Matrix
- 197Search a 2D Matrix II
- 198Find Minimum in Rotated Sorted Array II
- 199Koko Eating Bananas
- 200Minimum Number of Days to Make m Bouquets
- 201Split Array Largest Sum
- 202Median of Two Sorted Arrays
- 203Find K-th Smallest Pair Distance
- 204Sort an Array
- 205Top K Frequent Elements
- 206Sort Characters By Frequency
- 207Merge Intervals
- 208Insert Interval
- 209Non-overlapping Intervals
- 210Meeting Rooms
- 211Meeting Rooms II
- 212Jump Game
- 213Jump Game II
- 214Gas Station
- 215Hand of Straights
- 216Minimum Number of Arrows to Burst Balloons
- 217Single Number II
- 218Single Number III
- 219Number of 1 Bits
- 220Counting Bits
- 221Reverse Bits
- 222Missing Number
- 223Sum of Two Integers
- 224Maximum XOR of Two Numbers in an Array
- 225Subsets
- 226Subsets II