用 `dfs` 怎么错了？？？
by peterJr @ 2024-03-27 19:40:35
@[peterJr](/user/1050776)
```
#include<bits/stdc++.h>
using namespace std;
int n;
bool v[15];
int a[15];
bool b[30],c[30];
int ans=0;
void dfs(int x)
{
if (x>n)
{
ans++;
if (ans<=3)
{
for (int i=1;i<=n;i++)
cout<<a[i]<<" ";
cout<<endl;
}
}
else
{
for (int i=1;i<=n;i++)
{
if (v[i] && b[i+x] && c[i-x+n])
{
a[x]=i;
v[i]=false;
b[i+x]=false;
c[i-x+n]=false;
dfs(x+1);
v[i]=true;
b[i+x]=true;
c[i-x+n]=true;
}
}
}
}
int main()
{
cin>>n;
memset(v,true,sizeof(v));
memset(a,0,sizeof(a));
memset(b,true,sizeof(b));
memset(c,true,sizeof(c));
dfs(1);
cout<<ans;
return 0;
}
```
by jydz @ 2024-04-08 13:29:32