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10 | 10 | <!-- prettier-ignore -->
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11 | 11 | | 题号 | 标题 | 题解 | 标签 | 难度 | 力扣 |
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12 | 12 | | :------: | :------ | :------: | :------ | :------: | :------: |
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13 | | -| 504 | 七进制数 | | [`数学`](/tag/math.md) | 🟢 | [🀄️](https://leetcode.cn/problems/base-7) [🔗](https://leetcode.com/problems/base-7) | |
| 13 | +| 504 | 七进制数 | [[✓]](/problem/0504.md) | [`数学`](/tag/math.md) | 🟢 | [🀄️](https://leetcode.cn/problems/base-7) [🔗](https://leetcode.com/problems/base-7) | |
14 | 14 | | 405 | 数字转换为十六进制数 | [[✓]](/problem/0405.md) | [`位运算`](/tag/bit-manipulation.md) [`数学`](/tag/math.md) | 🟢 | [🀄️](https://leetcode.cn/problems/convert-a-number-to-hexadecimal) [🔗](https://leetcode.com/problems/convert-a-number-to-hexadecimal) |
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15 | 15 | | 190 | 颠倒二进制位 | [[✓]](/problem/0190.md) | [`位运算`](/tag/bit-manipulation.md) [`分治`](/tag/divide-and-conquer.md) | 🟢 | [🀄️](https://leetcode.cn/problems/reverse-bits) [🔗](https://leetcode.com/problems/reverse-bits) |
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16 | 16 | | 1009 | 十进制整数的反码 | [[✓]](/problem/1009.md) | [`位运算`](/tag/bit-manipulation.md) | 🟢 | [🀄️](https://leetcode.cn/problems/complement-of-base-10-integer) [🔗](https://leetcode.com/problems/complement-of-base-10-integer) |
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24 | 24 | | 260 | 只出现一次的数字 III | | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) | 🟠 | [🀄️](https://leetcode.cn/problems/single-number-iii) [🔗](https://leetcode.com/problems/single-number-iii) |
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25 | 25 | | 268 | 丢失的数字 | [[✓]](/problem/0268.md) | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) [`哈希表`](/tag/hash-table.md) `3+` | 🟢 | [🀄️](https://leetcode.cn/problems/missing-number) [🔗](https://leetcode.com/problems/missing-number) |
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26 | 26 | | 1349 | 参加考试的最大学生数 | | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) [`动态规划`](/tag/dynamic-programming.md) `2+` | 🔴 | [🀄️](https://leetcode.cn/problems/maximum-students-taking-exam) [🔗](https://leetcode.com/problems/maximum-students-taking-exam) |
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27 | | -| 645 | 错误的集合 | | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) [`哈希表`](/tag/hash-table.md) `1+` | 🟢 | [🀄️](https://leetcode.cn/problems/set-mismatch) [🔗](https://leetcode.com/problems/set-mismatch) | |
| 27 | +| 645 | 错误的集合 | [[✓]](/problem/0645.md) | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) [`哈希表`](/tag/hash-table.md) `1+` | 🟢 | [🀄️](https://leetcode.cn/problems/set-mismatch) [🔗](https://leetcode.com/problems/set-mismatch) | |
28 | 28 | | 78 | 子集 | [[✓]](/problem/0078.md) | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) [`回溯`](/tag/backtracking.md) | 🟠 | [🀄️](https://leetcode.cn/problems/subsets) [🔗](https://leetcode.com/problems/subsets) |
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29 | 29 | | 90 | 子集 II | [[✓]](/problem/0090.md) | [`位运算`](/tag/bit-manipulation.md) [`数组`](/tag/array.md) [`回溯`](/tag/backtracking.md) | 🟠 | [🀄️](https://leetcode.cn/problems/subsets-ii) [🔗](https://leetcode.com/problems/subsets-ii) |
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30 | 30 |
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