Hash Table

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# Title Acceptance Difficulty
676 Implement Magic Dictionary 51.3% Medium
648 Replace Words 47.7% Medium
645 Set Mismatch 40.4% Easy
632 Smallest Range 42.1% Hard
624 Maximum Distance in Arrays 33.7% Easy
609 Find Duplicate File in System 52.5% Medium
599 Minimum Index Sum of Two Lists 46.5% Easy
594 Longest Harmonious Subsequence 40.8% Easy
575 Distribute Candies 59.0% Easy
554 Brick Wall 45.3% Medium
535 Encode and Decode TinyURL 74.2% Medium
525 Contiguous Array 39.8% Medium
508 Most Frequent Subtree Sum 52.5% Medium
500 Keyboard Row 59.8% Easy
463 Island Perimeter 57.3% Easy
454 4Sum II 46.9% Medium
451 Sort Characters By Frequency 50.9% Medium
447 Number of Boomerangs 45.2% Easy
438 Find All Anagrams in a String 33.8% Easy
409 Longest Palindrome 45.5% Easy
389 Find the Difference 50.7% Easy
381 Insert Delete GetRandom O(1) - Duplicates allowed 28.9% Hard
380 Insert Delete GetRandom O(1) 39.2% Medium
359 Logger Rate Limiter 59.8% Easy
358 Rearrange String k Distance Apart 31.7% Hard
356 Line Reflection 30.1% Medium
355 Design Twitter 25.5% Medium
350 Intersection of Two Arrays II 44.7% Easy
349 Intersection of Two Arrays 47.4% Easy
347 Top K Frequent Elements 48.3% Medium
340 Longest Substring with At Most K Distinct Characters 38.8% Hard
336 Palindrome Pairs 26.3% Hard
325 Maximum Size Subarray Sum Equals k 42.6% Medium
314 Binary Tree Vertical Order Traversal 36.7% Medium
311 Sparse Matrix Multiplication 51.1% Medium
299 Bulls and Cows 35.0% Medium
290 Word Pattern 33.1% Easy
288 Unique Word Abbreviation 16.9% Medium
274 H-Index 33.3% Medium
266 Palindrome Permutation 57.0% Easy
249 Group Shifted Strings 41.8% Medium
246 Strobogrammatic Number 40.0% Easy
244 Shortest Word Distance II 38.5% Medium
242 Valid Anagram 46.6% Easy
219 Contains Duplicate II 32.5% Easy
217 Contains Duplicate 45.9% Easy
205 Isomorphic Strings 33.9% Easy
204 Count Primes 26.6% Easy
202 Happy Number 40.8% Easy
187 Repeated DNA Sequences 31.8% Medium
170 Two Sum III - Data structure design 24.8% Easy
166 Fraction to Recurring Decimal 17.6% Medium
159 Longest Substring with At Most Two Distinct Characters 41.4% Hard
149 Max Points on a Line 15.3% Hard
138 Copy List with Random Pointer 26.2% Medium
136 Single Number 54.6% Easy
94 Binary Tree Inorder Traversal 47.1% Medium
85 Maximal Rectangle 28.2% Hard
76 Minimum Window Substring 25.6% Hard
49 Group Anagrams 35.4% Medium
37 Sudoku Solver 30.5% Hard
36 Valid Sudoku 36.0% Medium
30 Substring with Concatenation of All Words 22.0% Hard
18 4Sum 26.9% Medium
3 Longest Substring Without Repeating Characters 24.4% Medium
1 Two Sum 35.1% Easy