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Blind 75 LeetCode Problems, with Visual Solutions

The Blind 75 is a list of 75 LeetCode problems that cover the patterns coding interviews keep returning to. Here it is in its original groups. Every one of the 75 links to a FaangPrep lesson that steps through the solution visually.

Working through it by pattern rather than in list order usually sticks better: see the patterns cheat sheet for a template per pattern, or the DSA 75 sheet, our own pattern-wise list with a visualizer for every problem.

Array (10)

  1. 01

    Two Sum
    Visual solutionLeetCode

  2. 02

    Best Time to Buy and Sell Stock
    Visual solutionLeetCode

  3. 03

    Contains Duplicate
    Visual solutionLeetCode

  4. 04

    Product of Array Except Self
    Visual solutionLeetCode

  5. 05

    Maximum Subarray

    Kadane's algorithm

    Visual solutionLeetCode

  6. 06

    Maximum Product Subarray
    Visual solutionLeetCode

  7. 07

    Find Minimum in Rotated Sorted Array
    Visual solutionLeetCode

  8. 08

    Search in Rotated Sorted Array
    Visual solutionLeetCode

  9. 09

    3Sum
    Visual solutionLeetCode

  10. 10

    Container With Most Water
    Visual solutionLeetCode

Binary (5)

  1. 11

    Sum of Two Integers
    Visual solutionLeetCode

  2. 12

    Number of 1 Bits
    Visual solutionLeetCode

  3. 13

    Counting Bits
    Visual solutionLeetCode

  4. 14

    Missing Number
    Visual solutionLeetCode

  5. 15

    Reverse Bits
    Visual solutionLeetCode

Dynamic Programming (11)

  1. 16

    Climbing Stairs
    Visual solutionLeetCode

  2. 17

    Coin Change
    Visual solutionLeetCode

  3. 18

    Longest Increasing Subsequence
    Visual solutionLeetCode

  4. 19

    Longest Common Subsequence
    Visual solutionLeetCode

  5. 20

    Word Break
    Visual solutionLeetCode

  6. 21

    Combination Sum IV
    Visual solutionLeetCode

  7. 22

    House Robber
    Visual solutionLeetCode

  8. 23

    House Robber II
    Visual solutionLeetCode

  9. 24

    Decode Ways
    Visual solutionLeetCode

  10. 25

    Unique Paths
    Visual solutionLeetCode

  11. 26

    Jump Game
    Visual solutionLeetCode

Graph (8)

  1. 27

    Clone Graph
    Visual solutionLeetCode

  2. 28

    Course Schedule
    Visual solutionLeetCode

  3. 29

    Pacific Atlantic Water Flow
    Visual solutionLeetCode

  4. 30

    Number of Islands
    Visual solutionLeetCode

  5. 31

    Longest Consecutive Sequence
    Visual solutionLeetCode

  6. 32

    Alien Dictionary
    Visual solutionLeetCode

  7. 33

    Graph Valid Tree
    Visual solutionLeetCode

  8. 34

    Number of Connected Components in an Undirected Graph
    Visual solutionLeetCode

Interval (5)

  1. 35

    Insert Interval
    Visual solutionLeetCode

  2. 36

    Merge Intervals
    Visual solutionLeetCode

  3. 37

    Non-overlapping Intervals
    Visual solutionLeetCode

  4. 38

    Meeting Rooms
    Visual solutionLeetCode

  5. 39

    Meeting Rooms II
    Visual solutionLeetCode

Linked List (6)

  1. 40

    Reverse Linked List
    Visual solutionLeetCode

  2. 41

    Linked List Cycle
    Visual solutionLeetCode

  3. 42

    Merge Two Sorted Lists
    Visual solutionLeetCode

  4. 43

    Merge k Sorted Lists
    Visual solutionLeetCode

  5. 44

    Remove Nth Node From End of List
    Visual solutionLeetCode

  6. 45

    Reorder List
    Visual solutionLeetCode

Matrix (4)

  1. 46

    Set Matrix Zeroes
    Visual solutionLeetCode

  2. 47

    Spiral Matrix
    Visual solutionLeetCode

  3. 48

    Rotate Image
    Visual solutionLeetCode

  4. 49

    Word Search
    Visual solutionLeetCode

String (10)

  1. 50

    Longest Substring Without Repeating Characters
    Visual solutionLeetCode

  2. 51

    Longest Repeating Character Replacement
    Visual solutionLeetCode

  3. 52

    Minimum Window Substring
    Visual solutionLeetCode

  4. 53

    Valid Anagram
    Visual solutionLeetCode

  5. 54

    Group Anagrams
    Visual solutionLeetCode

  6. 55

    Valid Parentheses
    Visual solutionLeetCode

  7. 56

    Valid Palindrome
    Visual solutionLeetCode

  8. 57

    Longest Palindromic Substring
    Visual solutionLeetCode

  9. 58

    Palindromic Substrings
    Visual solutionLeetCode

  10. 59

    Encode and Decode Strings
    Visual solutionLeetCode

Tree (14)

  1. 60

    Maximum Depth of Binary Tree
    Visual solutionLeetCode

  2. 61

    Same Tree
    Visual solutionLeetCode

  3. 62

    Invert Binary Tree
    Visual solutionLeetCode

  4. 63

    Binary Tree Maximum Path Sum
    Visual solutionLeetCode

  5. 64

    Binary Tree Level Order Traversal
    Visual solutionLeetCode

  6. 65

    Serialize and Deserialize Binary Tree
    Visual solutionLeetCode

  7. 66

    Subtree of Another Tree
    Visual solutionLeetCode

  8. 67

    Construct Binary Tree from Preorder and Inorder Traversal
    Visual solutionLeetCode

  9. 68

    Validate Binary Search Tree
    Visual solutionLeetCode

  10. 69

    Kth Smallest Element in a BST
    Visual solutionLeetCode

  11. 70

    Lowest Common Ancestor of a BST

    via the binary tree version (LeetCode 236), which also solves the BST case

    Visual solutionLeetCode

  12. 71

    Implement Trie (Prefix Tree)
    Visual solutionLeetCode

  13. 72

    Design Add and Search Words Data Structure
    Visual solutionLeetCode

  14. 73

    Word Search II
    Visual solutionLeetCode

Heap (2)

  1. 74

    Top K Frequent Elements
    Visual solutionLeetCode

  2. 75

    Find Median from Data Stream
    Visual solutionLeetCode