C++ 代码

#include<bits/stdc++.h>

using namespace std;

int arr[25];

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    memset(arr, 1, sizeof(arr));

    int n, m;

    cin >> n >> m;

    for (int i = 0; i < m; ++i) {
        arr[i] = 0;
    }

    do {
        for (int i = 0; i < n; ++i) {
            if (arr[i] == 0) {
                cout << i + 1 << ' ';
            }
        }
        cout << '\n';
    } while (next_permutation(arr, arr + n));

    return 0;
}