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Top Interview Questions

Essential problems for cracking coding interviews

29 Easy53 Medium17 Hard
0 of 99 solved0%

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Showing 99 of 99 problems

01Two Sumeasy
02Longest Substring Without Repeating Charactersmedium
03Longest Palindromic Substringmedium
04Regular Expression Matchinghard
05Roman to Integereasy
06Longest Common Prefixeasy
073Summedium
08Letter Combinations of a Phone Numbermedium
09Remove Nth Node From End of Listmedium
10Valid Parentheseseasy
11Merge Two Sorted Listseasy
12Generate Parenthesesmedium
13Search in Rotated Sorted Arraymedium
14Valid Anagrameasy
15Sudoku Solverhard
16Count and Saymedium
17Trapping Rain Waterhard
18Wildcard Matchinghard
19Maximum Subarrayeasy
20Rotate Imagemedium
21Merge Intervalsmedium
22Unique Pathsmedium
23Plus One Linked Listmedium
24Sqrt(x)easy
25Climbing Stairseasy
26Set Matrix Zeroesmedium
27Sliding Window Maximumhard
28Subsetsmedium
29Word Searchmedium
30Largest Rectangle in Histogramhard
31Merge Sorted Arrayeasy
32Decode Waysmedium
33Binary Tree Inorder Traversaleasy
34Symmetric Treeeasy
35Balanced Binary Treeeasy
36Binary Tree Level Order Traversaleasy
37Binary Tree Zigzag Level Order Traversalmedium
38Maximum Depth of Binary Treeeasy
39Construct Binary Tree from Preorder and Inorder Traversalmedium
40Populating Next Right Pointers in Each Nodemedium
41Pascal's Triangleeasy
42Best Time to Buy and Sell Stockeasy
43Best Time to Buy and Sell Stock IIeasy
44Binary Tree Maximum Path Sumhard
45Word Ladderhard
46Longest Consecutive Sequencemedium
47Surrounded Regionsmedium
48Palindrome Partitioningmedium
49Copy List with Random Pointermedium
50Word Breakmedium
51Word Break IIhard
52Middle of the Linked Listeasy
53Linked List Cyclemedium
54LRU Cachehard
55Maximum Product Subarraymedium
56Min Stackeasy
57Intersection of Two Linked Listseasy
58Excel Sheet Column Numbereasy
59Factorial Trailing Zeroeseasy
60Number of Islandsmedium
61Count Primesmedium
62Reverse Linked List IImedium
63Kth Smallest Element in a BSTmedium
64Palindrome Linked Listeasy
65Lowest Common Ancestor of a Binary Treemedium
66Find the Duplicate Numbermedium
67First Missing Positiveeasy
68Missing Numbereasy
69Inorder Successor in BSTmedium
70Find Median from Data Streamhard
71Serialize and Deserialize BSTmedium
72Longest Increasing Subsequencemedium
73Coin Changemedium
74Minimum Path Summedium
75Super Egg Drophard
76Best Time to Buy and Sell Stock IIIhard
77Minimum Platformsmedium
78Course Schedulemedium
79Minimum Insertion Steps to Make a String Palindromehard
80Compare Version Numbersmedium
81BFS of Graphmedium
82DFS of Graphmedium
83Same Treeeasy
84Meeting Rooms IImedium
85Stepping Numbersmedium
86Palindrome Partitioning IIhard
87Maximum Sum Increasing Subsequencemedium
88Merge k Sorted Listshard
89Lowest Common Ancestor of a BSTeasy
90Flatten Binary Tree to Linked Listmedium
91Binary Tree Left Side Viewmedium
92Top View of Binary Treemedium
934Summedium
94Rotting Orangesmedium
95Next Greater Element Imedium
96Remove Duplicates from Sorted List IImedium
97Median of Two Sorted Arrayshard
98Count Inversionsmedium
99Maximum Subarray Sumeasy