@[wdzxghl](/user/266774) dfs的时候，判合不合法你写的<n和<m应该是<=
by jiangby @ 2020-06-29 12:38:55
```
#include<bits/stdc++.h>
using namespace std;
int n,m;
int bf[20][20];
int ans;
int dx[5]{1,2,2,1};
int dy[5]{2,1,-1,-2};
void dfs(int x,int y)
{
if(x==m&&y==n) {ans++;return;}
for(int i=0;i<4;i++)
{
int xx=x+dx[i];
int yy=y+dy[i];
if(xx>=0&&xx<=m&&yy>=0&&yy<=n&&!bf[xx][yy])
{
bf[xx][yy]=1;
dfs(xx,yy);
bf[xx][yy]=0;
}
}
}
int main()
{
cin>>n>>m;
dfs(0,0);
cout<<ans<<endl;
return 0;
}
```
改后可过
by 林楚颜 @ 2020-07-22 19:33:09
@[林楚颜](/user/247159) 谢谢大佬
by wdzxghl @ 2020-07-24 10:55:54
@[disangan333](/user/75982)
by lixiaosheng @ 2022-04-19 19:17:17