77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
#include <cstdio>
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#include <cstdlib>
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#include <sstream>
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#include <iostream>
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#include <cmath>
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#include <cstring>
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#include <algorithm>
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#include <string>
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#include <utility>
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#include <vector>
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#include <queue>
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#include <stack>
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#include <map>
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#include <set>
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using namespace std;
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typedef long long ll;
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#define REP(i,n) for(int i=0;i < (n);i++)
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#define REPD(i,n) for(int i=(n-1);i >= 0;i--)
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#define FOR(i,s,t) for(int i = (s);i <= (t);i++)
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#define FORD(i,s,t) for(int i = (s);i >= (t);i--)
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#define PII pair<int,int>
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#define PB push_back
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#define MP make_pair
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#define ft first
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#define sd second
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#define lowbit(x) (x&(-x))
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#define INF (1<<30)
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int n,m;
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int C[2011][2011];
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char str[2011][2011];
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void fun(){
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C[0][0] = 0;
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FOR(i,1,n){
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C[i][0] = 0;
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FOR(j,1,m){
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C[i][j] = C[i][j-1]+(str[i][j]=='*'?1:0);
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}
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}
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FOR(i,2,n){
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FOR(j,1,m){
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C[i][j] += C[i-1][j];
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}
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}
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}
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int Area(int x1,int y1,int x2,int y2){
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if(x1>x2)swap(x1,x2);
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if(y1>y2)swap(y1,y2);
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return C[x2][y2]-C[x2][y1-1]-C[x1-1][y2]+C[x1-1][y1-1];
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}
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int main()
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{
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while(~scanf("%d%d",&n,&m),n,m){
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int x,y;
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scanf("%d%d",&x,&y);
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FOR(i,1,n)scanf("%s",str[i]+1);
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fun();
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int ans = 0;
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FOR(i,1,n){
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FOR(j,1,m){
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if(str[i][j] != '*')continue;
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int xx1 = i+x-1;
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int yy1 = j+y-1;
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if(!(xx1<1||yy1<1||xx1>n||yy1>m)){
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if(Area(i,j,xx1,yy1) == x*y)ans++;
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}
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int xx2 = i+y-1;
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int yy2 = j+x-1;
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if(xx2 == xx1 && yy2==yy1)continue;
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if(xx2<1||yy2<1||xx2>n||yy2>m)continue;
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if(Area(i,j,xx2,yy2) == x*y)ans++;
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}
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}
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printf("%d\n",ans);
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}
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return 0;
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}
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