6632出来是个924，我都不知道怎么算出来的

#include <bits/stdc++.h>
using namespace std;
int main(){
	int a[30][30]={0};
	
	int n,m,x,y;
	cin>>n>>m>>x>>y;
	for(int i=0;i<=n;i++){
		for(int j=0;j<=m;j++){
			a[i][j]=1;
			//TODO
		}
		//TODO
	}
	a[x][y]=0;
	if(x+2<=n&&y-1>=0){a[x+2][y-1]=0;}
	if(x+2<=n&&y+1<=m){a[x+2][y+1]=0;}
	if(x+1<=n&&y+2<=m){a[x+1][y+2]=0;}
	if(x-1>=n&&y+2<=m){a[x-1][y+2]=0;}
	if(x-2>=n&&y+1<=m){a[x-2][y+1]=0;}
	if(x-2>=n&&y-1>=0){a[x-2][y-1]=0;}
	if(x-1>=n&&y-2>=0){a[x-1][y-2]=0;}
	if(x+1<=n&&y-2>=0){a[x+1][y-2]=0;}
	for(int i=0;i<=n;i++){
		for(int j=0;j<= m;j++){	
			if(i==0&&j==0){
				continue;
				//TODO
			}
			if(a[i][j]=0){
				continue;
				
				//TODO
			}
			if(i==0)
			{
				a[i][j]=a[i][j-1];
				//TODO
			}else if(j==0){
				
				a[i][j]=a[i-1][j];
				
				//TODO
			}
			else{
				a[i][j]=a[i-1][j]+a[i][j-1];
				
			}
			//TODO
		}
		//TODO
	}
	cout<<a[n][m];
	
	
	
}