@[Brooksx](/user/529247)
```cpp
#include <cstdio>
#include<iostream>
using namespace std;
int c[31][31];
long long ans[30][30];
int d[9][2]={{0,0},{1,2},{1,-2},{-1,2},{-1,-2},
{2,1},{2,-1},{-2,1},{-2,-1}};
int n, m, x, y;
int main() {
cin>>n>>m>>x>>y;
for (int i = 0; i < 9; i++) {
int tmx=x+d[i][0],tmy=y+d[i][1];
if(tmx>=0&&tmx<=n&&tmy>=0&&tmy<=m){
c[tmx][tmy]=1;
}
}
ans[0][0]=1-c[0][0];
for (int i = 0; i <= n; i++) {
for (int j = 0; j <= m; j++) {
if (c[i][j] ) continue;
if (i!=0) ans[i][j]+=ans[i-1][j];
if (j!=0) ans[i][j]+=ans[i][j-1];
}
}
cout<<ans[n][m];
return 0;
}
```
by TakuChen @ 2021-07-02 19:29:46
@[Brooksx](/user/529247) 不知道为啥不能用scanf和printf要不然会错两个点
by TakuChen @ 2021-07-02 19:30:43
@[Brooksx](/user/529247)
1.马可以跳8个点
2.判断有没有越界
3.
```cpp
ans[0][0]=1-c[0][0];
```
的作用是如果这个点马走不到那ans[0][0]是1，否则是0
by TakuChen @ 2021-07-02 19:34:30
@[TakuChen](/user/358194) 只写了四个点是我忘了。。
by Br00k5xx @ 2021-07-02 19:42:00
@[Brooksx](/user/529247) 头打错了
by pmxin163 @ 2021-07-08 16:22:41
@[pmxin163](/user/528336) ？？？
by Br00k5xx @ 2021-07-08 18:26:23