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Array (1905)Sorting (440)Depth First Search (316)Database (301)Breadth First Search (241)Tree (240)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)
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Design a Sparse Arrayeasy-
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Find if there is a path between two vertices in a directed grapheasy-
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Find the Index of the First Occurrence in a Stringeasy-
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Two Sumeasy
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Palindrome Numbereasy
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Roman To Integereasy
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Longest Common Prefix in array of stringeasy-
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Valid Parentheseseasy
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Merge Two Sorted Linked Listseasy
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Number of Overlapping Lines between points on 2 parallel lineseasy-
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Remove duplicates from Sorted Array 1easy
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Plus One 1 - Given number as array plus oneeasy-
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Add Binary Stringseasy-
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Square root of an integereasy-
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Climbing Stairs - Take atmost 2 Stepseasy
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Remove duplicates from Sorted List 1easy
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Merge Two Sorted Arrayseasy-
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Binary Tree Inorder Traversaleasy-
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Same Treeeasy
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Symmetric Binary Treeeasy-
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Maximum Depth of Binary Treeeasy
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Convert Sorted Array to height-balanced Binary Search Treeeasy
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Balanced Binary Treeeasy-
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Minimum Depth of Binary Treeeasy-
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Path Sum 1 - Check if root to leaf path existseasy-
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Pascal’s Triangle 1 - Generate first n rowseasy-
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Best Time To Buy And Sell Stock 1 - only one transactioneasy
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Valid Palindromeeasy
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Single Number 1 - All elements except one occur twiceeasy
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Linked List Cycle 1 - Detect Cycleeasy
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Binary Tree Postorder Traversaleasy-
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Read N Characters Given Read4easy-
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Intersection of Two Linked Listseasy-
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Missing Rangeseasy-
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Excel Sheet Column Titleeasy-
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Majority Element 1 - with n by 2 definitioneasy-
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Excel Sheet Column Numbereasy-
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Employees Earning More Than Their Managers Problemeasy-
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Reverse Bitseasy
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Number of 1 Bitseasy
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Happy Numbereasy-
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Remove Linked List Elementseasy-
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Isomorphic Stringseasy
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Reverse Linked Listeasy
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Contains Duplicate 1 - Check if array has duplicateseasy
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Count Complete Tree Nodeseasy-
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Invert Binary Treeeasy
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Summary Rangeseasy-
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Palindrome Linked Listeasy-
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Valid Anagrameasy
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