80求调#3 闭关

#include<bits/stdc++.h>
using namespace std;
long long n,m,xy[25][25],dszdd=0,dp[25][25],t,qq,qx,qy;
int xdxy[4][2]={1,0,0,1};
long long mqzxd[25][25],xxx,yyy,mm,nn;
int main(){
	cin>>n>>m;
	cin>>nn>>mm;
	qq=9;
	xy[nn][mm]=1;
	xy[nn+1][mm+2]=1;
	xy[nn+2][mm+1]=1;
	xy[nn-1][mm+2]=1;
	xy[nn-2][mm+1]=1;
	xy[nn+1][mm-2]=1;
	xy[nn+2][mm-1]=1;
	xy[nn-1][mm-2]=1;
	xy[nn-2][mm-1]=1;
	dp[0][0]=1;
	for(int i=0;i<=n;i++){
		for(int j=0;j<=m;j++){
			if(!xy[i][j])dp[i][j]+=dp[i-1][j]+dp[i][j-1];
		}
	}
	cout<<dp[n][m];
	return  0;
}