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：
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数学篇-97题(Math, 97 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 | #2 | Add Two Numbers | 0.37 | 中等 |
| 2 | #535 | Encode and Decode TinyURL | 0.812 | 中等 |
| 3 | #7 | Reverse Integer | 0.339 | 简单 |
| 4 | #13 | Roman to Integer | 0.611 | 简单 |
| 5 | #9 | Palindrome Number | 0.572 | 简单 |
| 6 | #458 | Poor Pigs | 0.545 | 困难 |
| 7 | #233 | Number of Digit One | 0.342 | 困难 |
| 8 | #67 | Add Binary | 0.523 | 简单 |
| 9 | #258 | Add Digits | 0.659 | 简单 |
| 10 | #12 | Integer to Roman | 0.63 | 中等 |
| 11 | #202 | Happy Number | 0.576 | 简单 |
| 12 | #43 | Multiply Strings | 0.42 | 中等 |
| 13 | #754 | Reach a Number | 0.395 | 中等 |
| 14 | #728 | Self Dividing Numbers | 0.728 | 简单 |
| 15 | #372 | Super Pow | 0.394 | 中等 |
| 16 | #357 | Count Numbers with Unique Digits | 0.507 | 中等 |
| 17 | #264 | Ugly Number II | 0.508 | 中等 |
| 18 | #319 | Bulb Switcher | 0.452 | 中等 |
| 19 | #400 | Nth Digit | 0.359 | 中等 |
| 20 | #279 | Perfect Squares | 0.551 | 中等 |
| 21 | #413 | Arithmetic Slices | 0.602 | 中等 |
| 22 | #628 | Maximum Product of Three Numbers | 0.494 | 简单 |
| 23 | #313 | Super Ugly Number | 0.622 | 中等 |
| 24 | #368 | Largest Divisible Subset | 0.371 | 中等 |
| 25 | #29 | Divide Two Integers | 0.194 | 中等 |
| 26 | #224 | Basic Calculator | 0.371 | 困难 |
| 27 | #50 | Pow(x, n) | 0.342 | 中等 |
| 28 | #8 | String to Integer (atoi) | 0.194 | 中等 |
| 29 | #69 | Sqrt(x) | 0.376 | 简单 |
| 30 | #453 | Minimum Moves to Equal Array Elements | 0.534 | 简单 |
| 31 | #268 | Missing Number | 0.548 | 简单 |
| 32 | #343 | Integer Break | 0.553 | 中等 |
| 33 | #204 | Count Primes | 0.329 | 简单 |
| 34 | #672 | Bulb Switcher II | 0.528 | 中等 |
| 35 | #60 | Permutation Sequence | 0.486 | 中等 |
| 36 | #365 | Water and Jug Problem | 0.351 | 中等 |
| 37 | #172 | Factorial Trailing Zeroes | 0.399 | 简单 |
| 38 | #1230 | Toss Strange Coins | 0.408 | 中等 |
| 39 | #65 | Valid Number | 0.187 | 困难 |
| 40 | #171 | Excel Sheet Column Number | 0.669 | 简单 |
| 41 | #462 | Minimum Moves to Equal Array Elements II | 0.575 | 中等 |
| 42 | #223 | Rectangle Area | 0.427 | 中等 |
| 43 | #168 | Excel Sheet Column Title | 0.372 | 简单 |
| 44 | #149 | Max Points on a Line | 0.213 | 困难 |
| 45 | #592 | Fraction Addition and Subtraction | 0.485 | 中等 |
| 46 | #507 | Perfect Number | 0.379 | 简单 |
| 47 | #810 | Chalkboard XOR Game | 0.526 | 困难 |
| 48 | #633 | Sum of Square Numbers | 0.331 | 简单 |
| 49 | #396 | Rotate Function | 0.394 | 中等 |
| 50 | #537 | Complex Number Multiplication | 0.682 | 中等 |
| 51 | #866 | Prime Palindrome | 0.192 | 中等 |
| 52 | #553 | Optimal Division | 0.544 | 中等 |
| 53 | #423 | Reconstruct Original Digits from English | 0.522 | 中等 |
| 54 | #640 | Solve the Equation | 0.405 | 中等 |
| 55 | #927 | Three Equal Parts | 0.306 | 困难 |
| 56 | #263 | Ugly Number | 0.49 | 简单 |
| 57 | #273 | Integer to English Words | 0.266 | 困难 |
| 58 | #645 | Set Mismatch | 0.415 | 简单 |
| 59 | #598 | Range Addition II | 0.503 | 简单 |
| 60 | #805 | Split Array With Same Average | 0.257 | 困难 |
| 61 | #166 | Fraction to Recurring Decimal | 0.258 | 中等 |
| 62 | #670 | Maximum Swap | 0.4 | 中等 |
| 63 | #231 | Power of Two | 0.478 | 简单 |
| 64 | #335 | Self Crossing | 0.32 | 困难 |
| 65 | #483 | Smallest Good Base | 0.37 | 困难 |
| 66 | #367 | Valid Perfect Square | 0.433 | 简单 |
| 67 | #441 | Arranging Coins | 0.404 | 简单 |
| 68 | #899 | Orderly Queue | 0.496 | 困难 |
| 69 | #593 | Valid Square | 0.42 | 中等 |
| 70 | #523 | Continuous Subarray Sum | 0.229 | 中等 |
| 71 | #910 | Smallest Range II | 0.268 | 中等 |
| 72 | #660 | Remove 9 | 0.594 | 困难 |
| 73 | #360 | Sort Transformed Array | 0.603 | 中等 |
| 74 | #517 | Super Washing Machines | 0.408 | 困难 |
| 75 | #326 | Power of Three | 0.467 | 简单 |
| 76 | #942 | DI String Match | 0.713 | 简单 |
| 77 | #1362 | Closest Divisors | 0.474 | 中等 |
| 78 | #397 | Integer Replacement | 0.344 | 中等 |
| 79 | #248 | Strobogrammatic Number III | 0.413 | 困难 |
| 80 | #1307 | Verbal Arithmetic Puzzle | 0.333 | 困难 |
| 81 | #296 | Best Meeting Point | 0.617 | 困难 |
| 82 | #247 | Strobogrammatic Number II | 0.478 | 中等 |
| 83 | #651 | 4 Keys Keyboard | 0.573 | 中等 |
| 84 | #1359 | Count All Valid Pickup and Delivery Options | 0.535 | 困难 |
| 85 | #469 | Convex Polygon | 0.437 | 中等 |
| 86 | #1330 | Reverse Subarray To Maximize Array Value | 0.352 | 困难 |
| 87 | #963 | Minimum Area Rectangle II | 0.494 | 中等 |
| 88 | #1183 | Maximum Number of Ones | 0.494 | 困难 |
| 89 | #625 | Minimum Factorization | 0.323 | 中等 |
| 90 | #573 | Squirrel Simulation | 0.644 | 中等 |
| 91 | #1012 | Numbers With Repeated Digits | 0.278 | 困难 |
| 92 | #634 | Find the Derangement of An Array | 0.409 | 中等 |
| 93 | #356 | Line Reflection | 0.285 | 中等 |
| 94 | #1276 | Number of Burgers with No Waste of Ingredients | 0.491 | 中等 |
| 95 | #246 | Strobogrammatic Number | 0.464 | 简单 |
| 96 | #1199 | Minimum Time to Build Blocks | 0.371 | 困难 |
| 97 | #1131 | Maximum of Absolute Value Expression | 0.401 | 中等 |
相关/参考链接
leetcode-cn
leetcode