Up to now, the total number of LeetCode questions has been 1582题, and it is estimated that the average annual growth will be 300题around in the future . Most people will definitely be 刷不完的, so you have to selectively brush LeetCode.
A generally accepted strategy for brushing questions is 按类别刷题, but each category also has many questions, in a limited time 到底该刷哪些题呢? Individuals sorted out and included the topics in each category according LeetCode官方to each topic given . For topics whose official statistical frequency was too low, they were not included, and finally got this high-frequency topic table.出现频率高频出现
For example, the title of the title number #275and #270in the following figure will be included, and the #275frequency of occurrence is greater than #270; for the title of the title number #1011and #1182, because the occurrence frequency is too low, it will not be included:
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Graph, 12 problems (Graph, 12 problems)
Date of data: 2020/03/26 (LeetCode question number at this time: 1582)
Data source: LeetCode official. Questions of different categories are arranged in descending order according to the official frequency (Frequency), and questions with frequency statistics are selected.
| Sort | Question number | topic | Passing rate | Difficulty |
|---|---|---|---|---|
| 1 | #399 | Evaluate Division | 0.537 | medium |
| 2 | #207 | Course Schedule | 0.496 | medium |
| 3 | #133 | Clone Graph | 0.525 | medium |
| 4 | #332 | Reconstruct Itinerary | 0.363 | medium |
| 5 | #684 | Redundant Connection | 0.571 | medium |
| 6 | #310 | Minimum Height Trees | 0.33 | medium |
| 7 | #210 | Course Schedule II | 0.465 | medium |
| 8 | #685 | Redundant Connection II | 0.335 | difficult |
| 9 | #269 | Alien Dictionary | 0.381 | difficult |
| 10 | #444 | Sequence Reconstruction | 0.23 | medium |
| 11 | #323 | Number of Connected Components in an Undirected Graph | 0.553 | medium |
| 12 | #261 | Graph Valid Tree | 0.449 | medium |