腾讯马拉松 第三场 1003 小小明系列故事——游戏的烦恼 大水题

/*
author:jxy
lang:C/C++
university:China,Xidian University
**If you need to reprint,please indicate the source**
*/
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <queue>
#define INF 1E9
using namespace std;
int sum[2001][2003];
int main()
{
int n,m;
while(~scanf("%d%d",&n,&m)&&n+m)
{
int x,y;
scanf("%d%d",&x,&y);
int i,j;
getchar();
memset(sum,0,sizeof(sum));
for(i=1;i<=n;i++,getchar())
for(j=1;j<=m;j++)
{
if(getchar()=='*')
{
sum[i][j]=sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1]+1;
}
else sum[i][j]=sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1];
}
int ans=0;
for(i=0;i<n;i++)
for(j=0;j<m;j++)
{
if(i+x<=n&&j+y<=m&&sum[i+x][j+y]+sum[i][j]-sum[i+x][j]-sum[i][j+y]==(x*y))ans++;
if(x!=y&&i+y<=n&&j+x<=m&&sum[i+y][j+x]+sum[i][j]-sum[i+y][j]-sum[i][j+x]==(x*y))ans++;
}
printf("%d\n",ans);
}
}