#include<iostream>
#include<string>
#include<cstring>
#include<vector>
#include<algorithm>
using namespace std;
int main()
{
	string s;
	vector<char> v;
	cin >> s;
	for (int i = 0;i < s.size();i++) {
		char temp;
		temp = s[i];
		v.push_back(temp);
	}
	sort(v.begin(),v.end());
	do
	{
		for (int i = 0;i < s.size();i++) {
			cout << v[i];
		}
		cout << endl;
	} while (next_permutation(v.begin(), v.end()));//全排列函数next_permutation
	return 0;
}

next_permutation(start,end)函数的头文件为<algorithm>此函数需要两个参数:

next_permutation(开始地址，结束地址);