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| 357 |[计算各个位数不同的数字个数](https://github.com/openset/leetcode/tree/master/problems/count-numbers-with-unique-digits)|[[数学](https://github.com/openset/leetcode/tree/master/tag/math/README.md)][[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)]| Medium |
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| 351 |[安卓系统手势解锁](https://github.com/openset/leetcode/tree/master/problems/android-unlock-patterns) 🔒 |[[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)]| Medium |
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| 320 |[列举缩写](https://github.com/openset/leetcode/tree/master/problems/generalized-abbreviation) 🔒 |[[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)]| Medium |
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| 320 |[列举单词的全部缩写](https://github.com/openset/leetcode/tree/master/problems/generalized-abbreviation) 🔒 |[[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)]| Medium |
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| 306 |[累加数](https://github.com/openset/leetcode/tree/master/problems/additive-number)|[[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)]| Medium |
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| 294 |[翻转游戏 II](https://github.com/openset/leetcode/tree/master/problems/flip-game-ii) 🔒 |[[极小化极大](https://github.com/openset/leetcode/tree/master/tag/minimax/README.md)][[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)]| Medium |
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| 291 |[单词规律 II](https://github.com/openset/leetcode/tree/master/problems/word-pattern-ii) 🔒 |[[回溯算法](https://github.com/openset/leetcode/tree/master/tag/backtracking/README.md)]| Hard |
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| 493 |[翻转对](https://github.com/openset/leetcode/tree/master/problems/reverse-pairs)|[[排序](https://github.com/openset/leetcode/tree/master/tag/sort/README.md)][[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)][[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)][[分治算法](https://github.com/openset/leetcode/tree/master/tag/divide-and-conquer/README.md)]| Hard |
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| 327 |[区间和的个数](https://github.com/openset/leetcode/tree/master/problems/count-of-range-sum)|[[排序](https://github.com/openset/leetcode/tree/master/tag/sort/README.md)][[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)][[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)][[分治算法](https://github.com/openset/leetcode/tree/master/tag/divide-and-conquer/README.md)]| Hard |
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| 315 |[计算右侧小于当前元素的个数](https://github.com/openset/leetcode/tree/master/problems/count-of-smaller-numbers-after-self)|[[排序](https://github.com/openset/leetcode/tree/master/tag/sort/README.md)][[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)][[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)][[分治算法](https://github.com/openset/leetcode/tree/master/tag/divide-and-conquer/README.md)]| Hard |
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| 308 |[二维区域检索求和 - 可变](https://github.com/openset/leetcode/tree/master/problems/range-sum-query-2d-mutable) 🔒 |[[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)]| Hard |
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| 308 |[二维区域和检索 - 可变](https://github.com/openset/leetcode/tree/master/problems/range-sum-query-2d-mutable) 🔒 |[[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)]| Hard |
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| 307 |[区域和检索 - 数组可修改](https://github.com/openset/leetcode/tree/master/problems/range-sum-query-mutable)|[[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)]| Medium |
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| 218 |[天际线问题](https://github.com/openset/leetcode/tree/master/problems/the-skyline-problem)|[[堆](https://github.com/openset/leetcode/tree/master/tag/heap/README.md)][[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)][[分治算法](https://github.com/openset/leetcode/tree/master/tag/divide-and-conquer/README.md)][[Line Sweep](https://github.com/openset/leetcode/tree/master/tag/line-sweep/README.md)]| Hard |
| 327 |[区间和的个数](https://github.com/openset/leetcode/tree/master/problems/count-of-range-sum)|[[排序](https://github.com/openset/leetcode/tree/master/tag/sort/README.md)][[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)][[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)][[分治算法](https://github.com/openset/leetcode/tree/master/tag/divide-and-conquer/README.md)]| Hard |
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| 315 |[计算右侧小于当前元素的个数](https://github.com/openset/leetcode/tree/master/problems/count-of-smaller-numbers-after-self)|[[排序](https://github.com/openset/leetcode/tree/master/tag/sort/README.md)][[树状数组](https://github.com/openset/leetcode/tree/master/tag/binary-indexed-tree/README.md)][[线段树](https://github.com/openset/leetcode/tree/master/tag/segment-tree/README.md)][[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)][[分治算法](https://github.com/openset/leetcode/tree/master/tag/divide-and-conquer/README.md)]| Hard |
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| 302 |[包含黑色像素的最小矩形](https://github.com/openset/leetcode/tree/master/problems/smallest-rectangle-enclosing-black-pixels) 🔒 |[[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)]| Hard |
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| 302 |[包含全部黑色像素的最小矩形](https://github.com/openset/leetcode/tree/master/problems/smallest-rectangle-enclosing-black-pixels) 🔒 |[[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)]| Hard |
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| 300 |[最长上升子序列](https://github.com/openset/leetcode/tree/master/problems/longest-increasing-subsequence)|[[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)][[动态规划](https://github.com/openset/leetcode/tree/master/tag/dynamic-programming/README.md)]| Medium |
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| 287 |[寻找重复数](https://github.com/openset/leetcode/tree/master/problems/find-the-duplicate-number)|[[数组](https://github.com/openset/leetcode/tree/master/tag/array/README.md)][[双指针](https://github.com/openset/leetcode/tree/master/tag/two-pointers/README.md)][[二分查找](https://github.com/openset/leetcode/tree/master/tag/binary-search/README.md)]| Medium |
| 338 |[比特位计数](https://github.com/openset/leetcode/tree/master/problems/counting-bits)|[[位运算](https://github.com/openset/leetcode/tree/master/tag/bit-manipulation/README.md)][[动态规划](https://github.com/openset/leetcode/tree/master/tag/dynamic-programming/README.md)]| Medium |
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| 320 |[列举缩写](https://github.com/openset/leetcode/tree/master/problems/generalized-abbreviation) 🔒 |[[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)]| Medium |
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| 320 |[列举单词的全部缩写](https://github.com/openset/leetcode/tree/master/problems/generalized-abbreviation) 🔒 |[[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)]| Medium |
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| 318 |[最大单词长度乘积](https://github.com/openset/leetcode/tree/master/problems/maximum-product-of-word-lengths)|[[位运算](https://github.com/openset/leetcode/tree/master/tag/bit-manipulation/README.md)]| Medium |
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