题解

#include<cstdio>
using namespace std;
int n,b[15],a[15];
void dfs(int tmd){
	if(tmd == n){
		for(int i = 0;i < n;i++){
			printf("%5d",a[i]);
		}
		printf("\n");
		return ;
	}
	for(int i = 1;i <= n;i++){
		if(b[i] == 0){
			b[i] = 1;
			a[tmd] = i;
			dfs(tmd + 1);
			b[i] = 0;
		}
	}
}
int main(){
	scanf("%d",&n);
	dfs(0);
	return 0;
}