Blind 75

The classic interview sheet. A compact set of foundational problems across arrays, stacks, linked lists, and core patterns.

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01.Two Sumeasy 02.Contains Duplicateeasy 03.Valid Anagrameasy 04.Group Anagramsmedium 05.Top K Frequent Elementsmedium 06.Product of Array Except Selfmedium 07.Encode and Decode Stringsmedium 08.Longest Consecutive Sequencemedium 09.Valid Palindromeeasy 10.3Summedium 11.Container With Most Watermedium 12.Best Time to Buy and Sell Stockeasy 13.Longest Substring Without Repeating Charactersmedium 14.Longest Repeating Character Replacementmedium 15.Minimum Window Substringhard 16.Valid Parentheseseasy 17.Find Minimum in Rotated Sorted Arraymedium 18.Search in Rotated Sorted Arraymedium 19.Reverse Linked Listeasy 20.Merge Two Sorted Listseasy 21.Linked List Cycleeasy 22.Reorder Listmedium 23.Remove Nth Node From End of Listmedium 24.Merge K Sorted Listshard 25.Invert Binary Treeeasy 26.Maximum Depth of Binary Treeeasy 27.Same Treeeasy 28.Subtree of Another Treeeasy 29.Lowest Common Ancestor of a Binary Search Treemedium 30.Binary Tree Level Order Traversalmedium 31.Validate Binary Search Treemedium 32.Kth Smallest Element in a BSTmedium 33.Construct Binary Tree from Preorder and Inorder Traversalmedium 34.Binary Tree Maximum Path Sumhard 35.Serialize and Deserialize Binary Treehard 36.Implement Trie (Prefix Tree)medium 37.Design Add and Search Words Data Structuremedium 38.Word Search IIhard 39.Find Median from Data Streamhard 40.Word Searchmedium 41.Number of Islandsmedium 42.Clone Graphmedium 43.Pacific Atlantic Water Flowmedium 44.Course Schedulemedium 45.Graph Valid Treemedium 46.Number of Connected Components in an Undirected Graphmedium 47.Alien Dictionaryhard 48.Climbing Stairseasy 49.House Robbermedium 50.House Robber IImedium 51.Longest Palindromic Substringmedium 52.Palindromic Substringsmedium 53.Decode Waysmedium 54.Coin Changemedium 55.Maximum Product Subarraymedium 56.Word Breakmedium 57.Longest Increasing Subsequencemedium 58.Longest Common Subsequencemedium 59.Unique Pathsmedium 60.Combination Sum IVmedium 61.Jump Gamemedium 62.Maximum Subarraymedium 63.Insert Intervalmedium 64.Merge Intervalsmedium 65.Non-overlapping Intervalsmedium 66.Meeting Roomseasy 67.Meeting Rooms IImedium 68.Set Matrix Zeroesmedium 69.Spiral Matrixmedium 70.Rotate Imagemedium 71.Number of 1 Bitseasy 72.Counting Bitseasy 73.Reverse Bitseasy 74.Missing Numbereasy 75.Sum of Two Integersmedium