有哪位能帮我看一看!!!
#include<bits/stdc++.h>
using namespace std;
int bx,by,mx,my,a[30][30];//a[i][j]=a[i-1][j]+a[i][j-1];
int bj(int x,int y){
a[x][y]=2;
a[x-1][y-2]=2;
a[x-2][y-1]=2;
a[x-2][y+1]=2;
a[x-1][y+2]=2;
a[x+1][y-2]=2;
a[x+2][y-1]=2;
a[x+2][y+1]=2;
a[x+1][y+2]=2;
}
int main(){
cin>>bx>>by>>mx>>my;
bx++;
by++;
mx++;
my++;
a[1][1]=1;
for(int i=2;i<=bx;i++){
a[i][1]=1;
}
for(int i=2;i<=by;i++){
a[1][i]=1;
}
bj(mx,my);
for(int i=2;i<=bx;i++){
for(int j=2;j<=by;j++){
if(a[i][j]==2){
a[i][j]=0;
continue;
}
a[i][j]=a[i-1][j]+a[i][j-1];
}
}
cout<<a[bx][by];
}