hdu-1559

#include<iostream>#include<cstdio>using namespace std;int map[1002][1002],a[1002];int main(){int t,m,n,x,y,i,j,k,sum,ans;//freopen("d:\\test.txt","r",stdin);scanf("%d",&t);while(t--){scanf("%d%d%d%d",&m,&n,&x,&y);for(i=0;i<m;++i)for(j=0;j<n;++j)scanf("%d",&map[i][j]);ans=0;for(i=0;i<=m-x;++i) //注意等号{memset(a,0,sizeof(a));for(j=i;j<i+x;++j)for(k=0;k<n;++k)a[k]+=map[j][k];for(j=0;j<=n-y;++j) //注意等号{sum=0;for(k=j;k<j+y;++k)sum+=a[k];if(sum>ans)ans=sum;}}printf("%d\n",ans);}return 0;}