441.cpp

#include <bits/stdc++.h>
using namespace std;
int a[20];
bool view[20];
vector<int> v;
int n;
void call(int m) {
    if (v.size() == 6) {
        for (int i = 0; i < 6; i++) {
            if (i != 0) printf(" ");
            printf("%d", v[i]);
        }
        puts("");
        return;
    }
    for (int i = m; i < n; i++) {
        if (!view[i]) {
            view[i] = 1;
            v.push_back(a[i]);
            call(i + 1);
            v.pop_back();
            view[i] = 0;
        }
    }
    return;
}

int main() {
    int i, j = 0;
    while (scanf("%d", &n)) {
        memset(view, 0, sizeof(view));
        if (n == 0) return 0;
        for (i = 0; i < n; i++) scanf("%d", &a[i]);
        if (j != 0) puts("");
        call(0);
        j++;
    }
    return 0;
}