https://www.acwing.com/problem/content/798/

#include<bits/stdc++.h>
using namespace std;

int main() {

    int n,m;
    cin>>n>>m;

    int q;
    cin>>q;

    int a[n+1][m+1];
    int s[n+1][m+1];
    memset(s,0,sizeof(s));

    for(int i=1; i<=n; i++) {
        for(int j=1; j<=m; j++) {
            cin>>a[i][j];
            s[i][j]=s[i][j-1]+s[i-1][j]+a[i][j]-s[i-1][j-1];
        }
    }

    int x1,x2,y1,y2;
    while(q--) {
        cin>>x1>>y1>>x2>>y2;
        cout<<s[x2][y2]+s[x1-1][y1-1]-s[x2][y1-1]-s[x1-1][y2]<<endl;
    }

    return 0;
}