题解 | #【模板】二维前缀和#

#include<stdio.h>
#define ll long long
int main()
{
    int n,m,q,x1,y1,x2,y2;
    scanf("%d %d %d",&n,&m,&q);
    ll a[n+1][m+1],sum[n+1][m+1];
    for(int i=1;i<=n;i++)
    for(int j=1;j<=m;j++)
    scanf("%lld",&a[i][j]);
    for(int i=1;i<=n;i++)
    for(int j=1;j<=m;j++)
    sum[i][j]=sum[i-1][j]+sum[i][j-1]-sum[i-1][j-1]+a[i][j];
    while(q)
    {
        scanf("%d %d %d %d",&x1,&y1,&x2,&y2);
            printf("%lld\n",sum[x2][y2]-sum[x2][y1-1]-sum[x1-1][y2]+sum[x1-1][y1-1]);
            q--;
    }
    return 0;
}