[LeetCode] Find Permutation 找全排列
By now, you are given a secret signature consisting of character 'D' and 'I'. 'D' represen ...
原文：[LeetCode] Find the Derangement of An Array 找數組的錯排
In combinatorial mathematics, a derangement is a permutation of the elements of a set, such that no element appears in its original position. There s originally an array consisting ofnintegers from t ...
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