洛谷 1691 有重复元素的排列问题

#include
#include
#include
using namespace std;
int main()
{
    int n,m;
    scanf("%d",&m);
    string ch;
    cin >> ch;
    sort(ch.begin(),ch.end());
    n=0;
    do
    {
        cout << ch <

"next_permutation" is very cool