Hope's Brain

    100 Leetcode Must Known

    Array:

    1. Two Sum
    2. Container With Most Water
    3. Best Time to Buy and Sell Stock
    4. Product of Array Except Self
    5. Maximum Subarray
    6. Merge Intervals
    7. Rotate Array
    8. Combination Sum
    9. Missing Number
    10. Find All Numbers Disappeared in an Array

    String:

    1. Reverse String
    2. Valid Anagram
    3. Longest Palindromic Substring
    4. Group Anagrams
    5. Valid Parentheses
    6. Longest Common Prefix
    7. String to Integer (atoi)
    8. Palindrome Permutation
    9. Longest Substring Without Repeating Characters
    10. ZigZag Conversion

    Linked List:

    1. Reverse Linked List
    2. Merge Two Sorted Lists
    3. Add Two Numbers
    4. Remove Nth Node From End of List
    5. Intersection of Two Linked Lists
    6. Linked List Cycle
    7. Palindrome Linked List
    8. Flatten a Multilevel Doubly Linked List
    9. Copy List with Random Pointer
    10. LRU Cache

    Binary Tree:

    1. Maximum Depth of Binary Tree
    2. Invert Binary Tree
    3. Symmetric Tree
    4. Construct Binary Tree from Preorder and Inorder Traversal
    5. Validate Binary Search Tree
    6. Lowest Common Ancestor of a Binary Tree
    7. Binary Tree Level Order Traversal
    8. Path Sum
    9. Binary Tree Zigzag Level Order Traversal
    10. Flatten Binary Tree to Linked List

    Dynamic Programming:

    1. Climbing Stairs
    2. Coin Change
    3. Longest Increasing Subsequence
    4. Maximum Subarray
    5. Unique Paths
    6. Edit Distance
    7. House Robber
    8. Longest Palindromic Subsequence
    9. Word Break
    10. Best Time to Buy and Sell Stock

    Graph:

    1. Course Schedule
    2. Number of Islands
    3. Word Ladder
    4. Clone Graph
    5. Minimum Spanning Tree
    6. Network Delay Time
    7. Pacific Atlantic Water Flow
    8. Word Search
    9. Alien Dictionary
    10. Graph Valid Tree

    Backtracking:

    1. Permutations
    2. Subsets
    3. Letter Combinations of a Phone Number
    4. Palindrome Partitioning
    5. Word Search
    6. Combination Sum
    7. N-Queens
    8. Generate Parentheses
    9. Sudoku Solver
    10. Restore IP Addresses

    Sorting and Searching:

    1. Merge Intervals
    2. Find First and Last Position of Element in Sorted Array
    3. Search in Rotated Sorted Array
    4. Find Peak Element
    5. Kth Largest Element in an Array
    6. Median of Two Sorted Arrays
    7. Search a 2D Matrix
    8. Merge k Sorted Lists
    9. Count of Smaller Numbers After Self
    10. Find Minimum in Rotated Sorted Array

    Stack and Queue:

    1. Valid Parentheses
    2. Min Stack
    3. Implement Queue using Stacks
    4. Evaluate Reverse Polish Notation
    5. Sliding Window Maximum
    6. Implement Stack using Queues
    7. Design Circular Queue
    8. Largest Rectangle in Histogram
    9. Design Snake Game
    10. Simplify Path

    Greedy:

    1. Jump Game
    2. Container With Most Water
    3. Non-overlapping Intervals
    4. Partition Labels
    5. Minimum Number of Arrows to Burst Balloons
    6. Task Scheduler
    7. Lemonade Change
    8. Queue Reconstruction by Height
    9. Gas Station
    10. Meeting Rooms II