One C++ sentence to solve the problem AC by using the STL algorithm

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    use the STL algorithm ,we can solve the problem only one sentense.

    void nextPermutation(vector<int> &nums)
        next_permutation(nums.begin(), nums.end());

    next_permutation(first,last) in the <algorithm> head file,its defination is that:

    Rearranges the elements in the range [first,last) into the next lexicographically greater permutation.

    the cplusplus explantion

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