题解

#include <bits/stdc++.h>
using namespace std;
int a[15];
int main(){
	int n,i,j = 1,k;
	cin >> n;
	for(i = 1;i <= n;i++){
        a[i] = n - i + 1;
        j *= i;
    }
	for(i = 1;i <= j;i++){
        next_permutation(a + 1,a + n + 1);
    	for(k = 1;k <= n;k++){
            cout << "    " << a[k];
        }
    	cout << endl;
	 }
	 return 0;
}