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OJ Practices
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  • Introduction
  • Leetcode
    • Tree
    • Dynamic Programming
    • Depth-First-Search
    • Breadth-First Search
    • Two Pointers
    • Linked List
    • Backtracking
    • Binary Search
    • Union Find
    • Trie
    • Sort
    • Heap
    • Randomness
    • Topological Sort
    • Stack
    • Hash Table
      • 1 Two Sum
      • 3 Longest Substring Without Repeating Characters
      • 18 4Sum
      • 30 Substring with Concatenation of All Words
      • 37 Sudoku Solver
      • 49 Group Anagrams
      • 76 Minimum Window Substring
      • 136 Single Number
      • 138 Copy List with Random Pointer
      • 149 Max Points on a Line
      • 159 Longest Substring with At Most Two Distinct Characters
      • 166 Fraction to Recurring Decimal
      • 170 Two Sum III - Data structure design
      • 187 Repeated DNA Sequences
      • 202 Happy Number
      • 204 Count Primes
      • 205 Isomorphic Strings
      • 217 Contains Duplicate
      • 219 Contains Duplicate II
      • 242 Valid Anagram
      • 244 Shortest Word Distance II
      • 246 Strobogrammatic Number
      • 249 Group Shifted Strings
      • 266 Palindrome Permutation
      • 274 H-Index
      • 288 Unique Word Abbreviation
      • 290 Word Pattern
      • 299 Bulls and Cows
      • 311 Sparse Matrix Multiplication
      • 314 Binary Tree Vertical Order Traversal
      • 325 Maximum Size Subarray Sum Equals k
      • 336 Palindrome Pairs
      • 340 Longest Substring with At Most K Distinct Characters
      • 347 Top K Frequent Elements
      • 349 Intersection of Two Arrays
      • 350 Intersection of Two Arrays II
      • 355 Design Twitter
      • 356 Line Reflection
      • 358 Rearrange String k Distance Apart
      • 359 Logger Rate Limiter
      • 380 Insert Delete GetRandom O(1)
      • 381 Insert Delete GetRandom O(1) - Duplicates allowed
      • 387 First Unique Character in a String
      • 389 Find the Difference
      • 409 Longest Palindrome
      • 438 Find All Anagrams in a String
      • 447 Number of Boomerangs
      • 451 Sort Characters By Frequency
      • 454 4Sum II
      • 463 Island Perimeter
      • 500 Keyboard Row
      • 508 Most Frequent Subtree Sum
      • 525 Contiguous Array
      • 554 Brick Wall
      • 560 Subarray Sum Equals K
      • 575 Distribute Candies
      • 594 Longest Harmonious Subsequence
      • 599 Minimum Index Sum of Two Lists
      • 609 Find Duplicate File in System
      • 624 Maximum Distance in Arrays
      • 632 Smallest Range
      • 645 Set Mismatch
      • 648 Replace Words
      • 676 Implement Magic Dictionary
      • 692 Top K Frequent Words
      • 694 Number of Distinct Islands
      • 705 Design HashSet
      • 706 Design HashMap
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  1. Leetcode
  2. Hash Table

18 4Sum

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Last updated 5 years ago

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