@[paulpao](/user/717437) 马自己所在的点算了吗
by TankYu @ 2023-05-31 21:39:26
```cpp
x[hx][hy]=1;
```
@[TankYu](/user/408071) 算了，就是这一条
by paulpao @ 2023-06-01 11:09:36
```cpp
#include <iostream>
using namespace std;
long long f[22][22];
bool ctrl[22][22];
int n, m, x, y;
int d[9][2] = {2,1,1,2,-1,2,-2,1,-2,-1,-1,-2,1,-2,2,-1};
int main(){
cin>>n>>m>>x>>y;
for (int i = 0;i<=8;i++){
int tx = x+d[i][0], ty = y+d[i][1];
if (tx>=0&&ty>=0&&tx<=n&&ty<=m){
ctrl[tx][ty] = true;
}
}
if (ctrl[0][0]) {
cout<<0;
return 0;
}
f[0][0] = 1;
for (int i = 0;i<=n;i++)
for (int j = 0;j<=m;j++){
if(ctrl[i][j]) continue;
if (i) f[i][j]+=f[i-1][j];
if (j) f[i][j]+=f[i][j-1];
}
cout<<f[n][m];
return 0;
}
```
by Tx1234567 @ 2023-06-01 19:43:27