Hash Table

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# Title Acceptance Difficulty
554 Brick Wall 41.2% Medium
535 Encode and Decode TinyURL 74.7% Medium
525 Contiguous Array 36.0% Medium
508 Most Frequent Subtree Sum 51.9% Medium
500 Keyboard Row 60.2% Easy
463 Island Perimeter 56.8% Easy
454 4Sum II 45.4% Medium
451 Sort Characters By Frequency 50.6% Medium
447 Number of Boomerangs 44.1% Easy
438 Find All Anagrams in a String 33.4% Easy
409 Longest Palindrome 45.0% Easy
389 Find the Difference 51.5% Easy
381 Insert Delete GetRandom O(1) - Duplicates allowed 28.5% Hard
380 Insert Delete GetRandom O(1) 38.9% Medium
359 Logger Rate Limiter 59.0% Easy
358 Rearrange String k Distance Apart 31.8% Hard
356 Line Reflection 30.2% Medium
355 Design Twitter 25.0% Medium
350 Intersection of Two Arrays II 44.2% Easy
349 Intersection of Two Arrays 46.6% Easy
347 Top K Frequent Elements 47.3% Medium
340 Longest Substring with At Most K Distinct Characters 38.4% Hard
336 Palindrome Pairs 25.5% Hard
325 Maximum Size Subarray Sum Equals k 42.1% Medium
314 Binary Tree Vertical Order Traversal 36.2% Medium
311 Sparse Matrix Multiplication 50.6% Medium
299 Bulls and Cows 34.0% Medium
290 Word Pattern 32.6% Easy
288 Unique Word Abbreviation 16.0% Medium
274 H-Index 32.7% Medium
266 Palindrome Permutation 56.3% Easy
249 Group Shifted Strings 40.2% Medium
246 Strobogrammatic Number 39.4% Easy
244 Shortest Word Distance II 36.2% Medium
242 Valid Anagram 45.7% Easy
219 Contains Duplicate II 32.0% Easy
217 Contains Duplicate 44.8% Easy
205 Isomorphic Strings 33.2% Easy
204 Count Primes 26.4% Easy
202 Happy Number 40.0% Easy
187 Repeated DNA Sequences 30.6% Medium
170 Two Sum III - Data structure design 23.6% Easy
166 Fraction to Recurring Decimal 17.2% Medium
159 Longest Substring with At Most Two Distinct Characters 40.3% Hard
149 Max Points on a Line 15.4% Hard
138 Copy List with Random Pointer 26.5% Medium
136 Single Number 53.7% Easy
94 Binary Tree Inorder Traversal 45.3% Medium
85 Maximal Rectangle 27.0% Hard
76 Minimum Window Substring 24.6% Hard
49 Group Anagrams 33.2% Medium
37 Sudoku Solver 29.1% Hard
36 Valid Sudoku 34.8% Medium
30 Substring with Concatenation of All Words 21.8% Hard
18 4Sum 26.2% Medium
3 Longest Substring Without Repeating Characters 24.1% Medium
1 Two Sum 32.6% Easy
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