Hash Table

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# Title Acceptance Difficulty
535 Encode and Decode TinyURL 75.9% Medium
525 Contiguous Array 34.4% Medium
508 Most Frequent Subtree Sum 51.7% Medium
500 Keyboard Row 60.3% Easy
463 Island Perimeter 56.6% Easy
454 4Sum II 45.4% Medium
451 Sort Characters By Frequency 50.3% Medium
447 Number of Boomerangs 43.5% Easy
438 Find All Anagrams in a String 33.5% Easy
409 Longest Palindrome 44.9% Easy
389 Find the Difference 51.3% Easy
381 Insert Delete GetRandom O(1) - Duplicates allowed 28.4% Hard
380 Insert Delete GetRandom O(1) 38.8% Medium
359 Logger Rate Limiter 58.8% Easy
358 Rearrange String k Distance Apart 31.8% Hard
356 Line Reflection 30.3% Medium
355 Design Twitter 25.1% Medium
350 Intersection of Two Arrays II 44.0% Easy
349 Intersection of Two Arrays 46.4% Easy
347 Top K Frequent Elements 46.9% Medium
340 Longest Substring with At Most K Distinct Characters 38.4% Hard
336 Palindrome Pairs 25.3% Hard
325 Maximum Size Subarray Sum Equals k 42.0% Medium
314 Binary Tree Vertical Order Traversal 36.1% Medium
311 Sparse Matrix Multiplication 50.6% Medium
299 Bulls and Cows 33.8% Medium
290 Word Pattern 32.5% Easy
288 Unique Word Abbreviation 15.9% Medium
274 H-Index 32.6% Medium
266 Palindrome Permutation 56.1% Easy
249 Group Shifted Strings 40.0% Medium
246 Strobogrammatic Number 39.3% Easy
244 Shortest Word Distance II 35.8% Medium
242 Valid Anagram 45.5% Easy
219 Contains Duplicate II 31.9% Easy
217 Contains Duplicate 44.5% Easy
205 Isomorphic Strings 33.0% Easy
204 Count Primes 26.3% Easy
202 Happy Number 39.8% Easy
187 Repeated DNA Sequences 30.3% Medium
170 Two Sum III - Data structure design 23.4% Easy
166 Fraction to Recurring Decimal 17.1% Medium
159 Longest Substring with At Most Two Distinct Characters 40.2% Hard
149 Max Points on a Line 15.5% Hard
138 Copy List with Random Pointer 26.5% Medium
136 Single Number 53.5% Easy
94 Binary Tree Inorder Traversal 44.9% Medium
85 Maximal Rectangle 26.8% Hard
76 Minimum Window Substring 24.4% Hard
49 Group Anagrams 32.9% Medium
37 Sudoku Solver 28.9% Hard
36 Valid Sudoku 34.6% Medium
30 Substring with Concatenation of All Words 21.8% Hard
18 4Sum 26.1% Medium
3 Longest Substring Without Repeating Characters 24.0% Medium
1 Two Sum 31.9% Easy
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