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9 | 9 |
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10 | 10 | | # | 题名 | 标签 | 难度 |
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11 | 11 | | :-: | - | - | :-: |
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| 12 | +| 996 | [正方形数组的数目](https://github.com/openset/leetcode/tree/master/problems/number-of-squareful-arrays) | [[图](https://github.com/openset/leetcode/tree/master/tag/graph/README.md)] [[数学](https://github.com/openset/leetcode/tree/master/tag/math/README.md)] [[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)] | Hard | |
12 | 13 | | 980 | [不同路径 III](https://github.com/openset/leetcode/tree/master/problems/unique-paths-iii) | [[动态规划](https://github.com/openset/leetcode/tree/master/tag/dynamic-programming/README.md)] [[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)] | Hard |
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13 | 14 | | 842 | [将数组拆分成斐波那契序列](https://github.com/openset/leetcode/tree/master/problems/split-array-into-fibonacci-sequence) | [[贪心算法](https://github.com/openset/leetcode/tree/master/tag/greedy/README.md)] [[字符串](https://github.com/openset/leetcode/tree/master/tag/string/README.md)] [[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)] | Medium |
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14 | 15 | | 784 | [字母大小写全排列](https://github.com/openset/leetcode/tree/master/problems/letter-case-permutation) | [[位运算](https://github.com/openset/leetcode/tree/master/tag/bit-manipulation/README.md)] [[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)] | Easy |
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