C++ 代码
#include <cstdio>
#include <iostream>
using namespace std;
const int N = 20;
int path[N];
int n;
bool st[N];
void dfs(int u)
{
if (u == n)
{
for (int i = 0; i < n; i ++ )
printf("%d ", path[i]);
printf("\n");
return ;
}
for (int i = 1; i <= n; i ++ )
if (!st[i])
{
path[u] = i;
st[i] = true;
dfs(u + 1);
st[i] = false;
}
}
int main()
{
cin >> n;
dfs(0);
return 0;
}