八皇后

 

 

惊恐！！！！！

今天才发先我还没有写八皇后...

然后就水了一发。

立flag不1A就退役...

果然没有辜负我.

原来以我的水平切八皇后还没有问题2333

突然有些害怕

 

#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
inline int read() {
    int res = 0;char ch=getchar();
    while(!isdigit(ch))ch=getchar();
    while(isdigit(ch))res=(res<<3)+(res<<1)+(ch^48), ch=getchar();
    return res;    
}
#define reg register

int n;
bool vis1[15], vis2[15*2], vis3[15*2];
int ans;
int tim;
int road[15];
inline void print()
{
    for (reg int i = 1 ; i <= n ; i ++)
        printf("%d ", road[i]);
    puts("");
}

void dfs(int x)
{
    if (x > n) 
    {
        if (++tim <= 3) print();
        ans++;
        return ;
    }
    for (reg int i = 1 ; i <= n ; i ++)
    {
        if (vis1[i]) continue;
        if (vis2[x+i]) continue;
        if (vis3[x+n-i]) continue;
        vis1[i] = 1, vis2[x+i] = 1, vis3[x+n-i] = 1;
        road[x] = i;
        dfs(x + 1);
        vis1[i] = 0, vis2[x+i] = 0, vis3[x+n-i] = 0;
        road[x] = 0;        
    }
}

int main()
{
    n = read();
    dfs(1);
    printf("%d\n", ans);
    return 0;
}