31. 下一个排列 排列 原理就是 C++ 中的 next_permutation 函数，生成指定序列的下一个全排列 从给定序列的最右端开始，找到第一个满足 nums[i] < nums[i + 1] 的元素 nums[i] 若找不到这样的元素 nums[i]：说明当前序列是最后一个排列，函数…
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