#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
LL a[1010][1010],b[1010][1010];
LL n,m,c;
LL x2,y2;
LL ans=-1e20;
int main()
{
    cin>>n>>m>>c;
    for(int i=1;i<=n;i++)
    for(int j=1;j<=m;j++)
    {
        cin>>a[i][j];
        b[i][j]=a[i][j]+b[i-1][j]+b[i][j-1]-b[i-1][j-1];
    }
    for(int x1=1;x1<=n-c;x1++){
    	for(int y1=1;y1<=m-c;y1++){
    				if(b[x1+c-1][y1+c-1]+b[x1-1][y1-1]-b[x1+c-1][y1-1]-b[x1-1][y1+c-1]>ans){
    					ans=b[x1+c-1][y1+c-1]+b[x1-1][y1-1]-b[x1+c-1][y1-1]-b[x1-1][y1+c-1];
						   x2=x1,y2=y1;
					}
    	}
    }
    cout<<x2<<" "<<y2;
}

数组也开大了，也有long long 不知道哪错了 是ra不是超时