permutari nume

#include <iostream>
#include <cstring>
#define NMAX 20
#define LENMAX 30
using namespace std;
int n, used[NMAX];
char s[NMAX][LENMAX], st[NMAX][LENMAX];

void read() {
    cin >> n;
    cin.get();
    for (int i = 1; i <= n; i++)
        cin.getline(s[i], LENMAX);
}

void display() {
    for (int i = 1; i <= n; i++)
        cout << st[i] << ',';
    cout << endl;
}

void bktr(int k) {
    if (k == n + 1)
        display();
    else
        for (int i = 1; i <= n; i++)
            if (!used[i]) {
                strcpy(st[k], s[i]);
                used[i] = 1;
                bktr(k + 1);
                used[i] = 0;
            }
}

int main() {
    read();
    bktr(1);
    return 0;
}