#include <algorithm> class Solution { public: /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param str string字符串 * @return string字符串vector */ void Permutation(vector<string> & res,string str_head, string str,vector<bool> vt_vis) { if (str_head.length() == str.length()) { res...