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3 | 3 | [](https://996.icu) |
4 | 4 |
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5 | 5 | ## 说明 |
6 | | -- leetcode练习，坚持每天一道，目前已完成159道 |
| 6 | +- leetcode练习，坚持每天一道，目前已完成161道 |
7 | 7 | - 解题语言是Java |
8 | 8 | - 每道题都是可编译运行的 |
9 | 9 | - 每道题有自己的方法和他人优秀解法 |
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15 | 15 |
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16 | 16 | 开始一道道的刷题了，如有期望刷特定题目的，欢迎提issue。这周出去浪4天，所以只刷三道题目了 |
17 | 17 |
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18 | | -- [ ] [36. 有效的数独-Medium](https://leetcode-cn.com/problems/valid-sudoku/) |
19 | | - |
20 | | -- [ ] [37. 解数独-Hard](https://leetcode-cn.com/problems/sudoku-solver/) |
21 | | - |
| 18 | +- [x] [36. 有效的数独-Medium](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_36_isValidSudoku.java) |
| 19 | +- [x] [37. 解数独-Hard](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_37_solveSudoku.java) |
22 | 20 | - [x] [38. 报数-Easy](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_38_countAndSay.java) |
23 | 21 |
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| 22 | +下周题目预告：回溯相关题解 |
| 23 | + |
24 | 24 | ## 已解题目 |
25 | 25 |
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26 | 26 | > 20190404# leetcode目前已有题目1020道，免费852道 |
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54 | 54 | - [线段树](https://leetcode-cn.com/tag/segment-tree/)（9） |
55 | 55 | - [二叉搜索树](https://leetcode-cn.com/tag/binary-search-tree/)（15） |
56 | 56 |
|
57 | | -### 题目列表（更新中--已完成159） |
| 57 | +### 题目列表（更新中--已完成161） |
58 | 58 |
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59 | 59 | | No | 题目 | 解决方案 | 相关话题 | 难度 | remark | |
60 | 60 | | ----- | ------------------------------------------------------------ | ------------------------------------------------------------ | ------------------------------------------------------------ | ------ | ------------------------------------------------------------ | |
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93 | 93 | | #33 | [搜索旋转排序数组](https://leetcode-cn.com/problems/search-in-rotated-sorted-array/) | [Search](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_33_search.java) | [数组](<https://leetcode-cn.com/tag/array/>)、[二分查找](<https://leetcode-cn.com/tag/binary-search/>) | Medium | | |
94 | 94 | | #34 | [在排序数组中查找元素的第一个和最后一个位置](https://leetcode-cn.com/problems/find-first-and-last-position-of-element-in-sorted-array/) | [SearchRange](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_34_searchRange.java) | [数组](<https://leetcode-cn.com/tag/array/>)、[二分查找](<https://leetcode-cn.com/tag/binary-search/>) | Medium | | |
95 | 95 | | #35 | [搜索插入位置](https://leetcode-cn.com/problems/search-insert-position/) | [SearchInsert](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_35_searchInsert.java) | [数组](<https://leetcode-cn.com/tag/array/>)、[二分查找](<https://leetcode-cn.com/tag/binary-search/>) | Easy | | |
| 96 | +| #36 | [有效的数独](https://leetcode-cn.com/problems/valid-sudoku/) | [IsValidSudoku](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_36_isValidSudoku.java) | [哈希表](<https://leetcode-cn.com/tag/hash-table/>) | Medium | | |
| 97 | +| #37 | [解数独](https://leetcode-cn.com/problems/sudoku-solver/) | [SolveSudoku](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_37_solveSudoku.java) | [哈希表](<https://leetcode-cn.com/tag/hash-table/>)、[回溯算法](<https://leetcode-cn.com/tag/backtracking/>) | Hard | | |
96 | 98 | | #38 | [报数](https://leetcode-cn.com/problems/count-and-say/) | [CountAndSay](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_38_countAndSay.java) | [字符串](<https://leetcode-cn.com/tag/string/>) | Easy | | |
97 | 99 | | #40 | [组合总和 II](https://leetcode-cn.com/problems/combination-sum-ii/) | [CombinationSum2](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_40_combinationSum2.java) | [数组](<https://leetcode-cn.com/tag/array/>)、[回溯算法](<https://leetcode-cn.com/tag/backtracking/>) | Medium | | |
98 | 100 | | #42 | [接雨水](https://leetcode-cn.com/problems/trapping-rain-water/) | [Trap](https://github.com/pphdsny/Leetcode-Java/blob/master/src/pp/arithmetic/leetcode/_42_trap.java) | [栈](https://leetcode-cn.com/tag/stack/)、[数组](<https://leetcode-cn.com/tag/array/>)、[双指针](<https://leetcode-cn.com/tag/two-pointers/>) | Hard | | |
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