Hash Table
1 Two Sum3 Longest Substring Without Repeating Characters18 4Sum30 Substring with Concatenation of All Words37 Sudoku Solver49 Group Anagrams76 Minimum Window Substring136 Single Number138 Copy List with Random Pointer149 Max Points on a Line159 Longest Substring with At Most Two Distinct Characters166 Fraction to Recurring Decimal170 Two Sum III - Data structure design187 Repeated DNA Sequences202 Happy Number204 Count Primes205 Isomorphic Strings217 Contains Duplicate219 Contains Duplicate II242 Valid Anagram244 Shortest Word Distance II246 Strobogrammatic Number249 Group Shifted Strings266 Palindrome Permutation274 H-Index288 Unique Word Abbreviation290 Word Pattern299 Bulls and Cows311 Sparse Matrix Multiplication314 Binary Tree Vertical Order Traversal325 Maximum Size Subarray Sum Equals k336 Palindrome Pairs340 Longest Substring with At Most K Distinct Characters347 Top K Frequent Elements349 Intersection of Two Arrays350 Intersection of Two Arrays II355 Design Twitter356 Line Reflection358 Rearrange String k Distance Apart359 Logger Rate Limiter380 Insert Delete GetRandom O(1)381 Insert Delete GetRandom O(1) - Duplicates allowed387 First Unique Character in a String389 Find the Difference409 Longest Palindrome438 Find All Anagrams in a String447 Number of Boomerangs451 Sort Characters By Frequency454 4Sum II463 Island Perimeter500 Keyboard Row508 Most Frequent Subtree Sum525 Contiguous Array554 Brick Wall560 Subarray Sum Equals K575 Distribute Candies594 Longest Harmonious Subsequence599 Minimum Index Sum of Two Lists609 Find Duplicate File in System624 Maximum Distance in Arrays632 Smallest Range645 Set Mismatch648 Replace Words676 Implement Magic Dictionary692 Top K Frequent Words694 Number of Distinct Islands705 Design HashSet706 Design HashMap
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