luogu P1706 全排列问题

 1 #include <iostream>
 2 using namespace std;
 3 int vis[10],ans[10],n;
 4 void f(int x)
 5 {
 6     if (x == n + 1)
 7     {
 8         for (int i = 1;i <= n;i++)
 9             cout << "    " << ans[i];
10         cout << endl;
11         return;
12     }
13     for (int i = 1;i <= n;i++)
14         if (vis[i] == 0)
15         {
16             vis[i] = 1;
17             ans[x] = i;
18             f(x + 1);
19             vis[i] = 0;
20         }
21         
22 }
23 int main()
24 {
25     cin >> n;
26     f(1);
27     return 0;
28 }