include <iostream>

#include <string>

using namespace std;

void swap(char &c1, char &c2){

    char tmp = c1;

    c1= c2;

    c2= tmp;

}

void perm(string s, int i, int n){

    if(i== n){

        cout << s << endl;

    }

    for(int j=i;j<=n;j++){

        swap(s[i], s[j]);

        perm(s, i+, n);

        swap(s[i], s[j]);

    }

}

int main(){

    string p= "";

    perm(p, , );

}