爱站程序员基地截止至今LeetCode题目总量已经有
1582题
，估计将来每年平均增长
300题
左右，大部分人肯定是
刷不完的
，所以得有选择地刷LeetCode。
一种公认的刷题策略是
按类别刷题
，可是每个类别也有许多题，在有限的时间里
到底该刷哪些题呢
？个人根据
LeetCode官方
给出的每个题目的
出现频率
，整理并收录了每个类别里
高频出现
的题目，对于官方统计频率太低的题目，不予收录，最终得到了这个高频题目表格。
例如，对于下图中题号
#275
与
#270
的题目将被收录，并且
#275
出现频率大于
#270
；而对于题号
#1011
与
#1182
的题目，因为出现频率太低，将不被收录：
撸起键盘加油干！祝大家成功上岸！整理不易，点个赞吧！
哈希表篇-81题(Hash Table, 81 problems)
数据日期： 2020/03/26 (此时LeetCode题目数量：1582)
数据来源： LeetCode官方，将不同类别的题目按照官方给的出现频率(Frequency)降序排列，取有频率统计的题。
| 排序 | 题号 | 题目 | 通过率 | 难度 |
|---|---|---|---|---|
| 1 | #1 | Two Sum | 0.479 | 简单 |
| 2 | #535 | Encode and Decode TinyURL | 0.812 | 中等 |
| 3 | #3 | Longest Substring Without Repeating Characters | 0.335 | 中等 |
| 4 | #85 | Maximal Rectangle | 0.449 | 困难 |
| 5 | #37 | Sudoku Solver | 0.605 | 困难 |
| 6 | #94 | Binary Tree Inorder Traversal | 0.707 | 中等 |
| 7 | #739 | Daily Temperatures | 0.595 | 中等 |
| 8 | #18 | 4Sum | 0.374 | 中等 |
| 9 | #136 | Single Number | 0.66 | 简单 |
| 10 | #202 | Happy Number | 0.576 | 简单 |
| 11 | #349 | Intersection of Two Arrays | 0.685 | 简单 |
| 12 | #463 | Island Perimeter | 0.658 | 简单 |
| 13 | #30 | Substring with Concatenation of All Words | 0.299 | 困难 |
| 14 | #632 | Smallest Range Covering Elements from K Lists | 0.356 | 困难 |
| 15 | #718 | Maximum Length of Repeated Subarray | 0.492 | 中等 |
| 16 | #76 | Minimum Window Substring | 0.355 | 困难 |
| 17 | #500 | Keyboard Row | 0.685 | 简单 |
| 18 | #187 | Repeated DNA Sequences | 0.44 | 中等 |
| 19 | #560 | Subarray Sum Equals K | 0.443 | 中等 |
| 20 | #447 | Number of Boomerangs | 0.572 | 简单 |
| 21 | #49 | Group Anagrams | 0.612 | 中等 |
| 22 | #138 | Copy List with Random Pointer | 0.476 | 中等 |
| 23 | #409 | Longest Palindrome | 0.549 | 简单 |
| 24 | #690 | Employee Importance | 0.575 | 简单 |
| 25 | #204 | Count Primes | 0.329 | 简单 |
| 26 | #347 | Top K Frequent Elements | 0.607 | 中等 |
| 27 | #525 | Contiguous Array | 0.416 | 中等 |
| 28 | #726 | Number of Atoms | 0.437 | 困难 |
| 29 | #36 | Valid Sudoku | 0.588 | 中等 |
| 30 | #454 | 4Sum II | 0.543 | 中等 |
| 31 | #1044 | Longest Duplicate Substring | 0.175 | 困难 |
| 32 | #781 | Rabbits in Forest | 0.543 | 中等 |
| 33 | #594 | Longest Harmonious Subsequence | 0.461 | 简单 |
| 34 | #389 | Find the Difference | 0.612 | 简单 |
| 35 | #336 | Palindrome Pairs | 0.331 | 困难 |
| 36 | #149 | Max Points on a Line | 0.213 | 困难 |
| 37 | #217 | Contains Duplicate | 0.518 | 简单 |
| 38 | #290 | Word Pattern | 0.423 | 简单 |
| 39 | #242 | Valid Anagram | 0.591 | 简单 |
| 40 | #219 | Contains Duplicate II | 0.379 | 简单 |
| 41 | #274 | H-Index | 0.379 | 中等 |
| 42 | #350 | Intersection of Two Arrays II | 0.474 | 简单 |
| 43 | #575 | Distribute Candies | 0.66 | 简单 |
| 44 | #205 | Isomorphic Strings | 0.473 | 简单 |
| 45 | #299 | Bulls and Cows | 0.472 | 简单 |
| 46 | #438 | Find All Anagrams in a String | 0.42 | 中等 |
| 47 | #645 | Set Mismatch | 0.415 | 简单 |
| 48 | #355 | Design Twitter | 0.367 | 中等 |
| 49 | #508 | Most Frequent Subtree Sum | 0.627 | 中等 |
| 50 | #720 | Longest Word in Dictionary | 0.461 | 简单 |
| 51 | #166 | Fraction to Recurring Decimal | 0.258 | 中等 |
| 52 | #648 | Replace Words | 0.536 | 中等 |
| 53 | #1001 | Grid Illumination | 0.271 | 困难 |
| 54 | #387 | First Unique Character in a String | 0.44 | 简单 |
| 55 | #451 | Sort Characters By Frequency | 0.63 | 中等 |
| 56 | #554 | Brick Wall | 0.358 | 中等 |
| 57 | #676 | Implement Magic Dictionary | 0.565 | 中等 |
| 58 | #692 | Top K Frequent Words | 0.497 | 中等 |
| 59 | #966 | Vowel Spellchecker | 0.383 | 中等 |
| 60 | #711 | Number of Distinct Islands II | 0.561 | 困难 |
| 61 | #381 | Insert Delete GetRandom O(1) – Duplicates allowed | 0.369 | 困难 |
| 62 | #599 | Minimum Index Sum of Two Lists | 0.502 | 简单 |
| 63 | #609 | Find Duplicate File in System | 0.521 | 中等 |
| 64 | #244 | Shortest Word Distance II | 0.494 | 中等 |
| 65 | #380 | Insert Delete GetRandom O(1) | 0.478 | 中等 |
| 66 | #311 | Sparse Matrix Multiplication | 0.728 | 中等 |
| 67 | #325 | Maximum Size Subarray Sum Equals k | 0.477 | 中等 |
| 68 | #159 | Longest Substring with At Most Two Distinct Characters | 0.51 | 中等 |
| 69 | #314 | Binary Tree Vertical Order Traversal | 0.539 | 中等 |
| 70 | #359 | Logger Rate Limiter | 0.691 | 简单 |
| 71 | #694 | Number of Distinct Islands | 0.457 | 中等 |
| 72 | #358 | Rearrange String k Distance Apart | 0.341 | 困难 |
| 73 | #249 | Group Shifted Strings | 0.604 | 中等 |
| 74 | #288 | Unique Word Abbreviation | 0.314 | 中等 |
| 75 | #734 | Sentence Similarity | 0.488 | 简单 |
| 76 | #340 | Longest Substring with At Most K Distinct Characters | 0.464 | 困难 |
| 77 | #266 | Palindrome Permutation | 0.631 | 简单 |
| 78 | #624 | Maximum Distance in Arrays | 0.406 | 简单 |
| 79 | #170 | Two Sum III – Data structure design | 0.407 | 简单 |
| 80 | #356 | Line Reflection | 0.285 | 中等 |
| 81 | #246 | Strobogrammatic Number | 0.464 | 简单 |
相关/参考链接
leetcode-cn
leetcode
