OI-codes/AcWing/842/842.cpp

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, a[10];
    cin >> n;
    for (int i = 0; i < n; i++) {
        a[i] = i + 1;
    }
    do {
        for (int i = 0; i < n; i++) {
            cout << a[i] << ' ';
        }
        cout << endl;
    } while (next_permutation(a, a + n));
    return 0;
}