题目描述

子矩阵的和 C++

样例

// 子矩阵的和
#include <iostream>
using namespace std;

const int N = 1010;
int arr[N][N];
int S[N][N];

int main()
{
    int m, n, q;
    cin >> m >> n >> q;
    for (int i=1;i<=m;i++)
    {
        for (int j=1;j<=n;j++)
        {
            cin >> arr[i][j];
            S[i][j] = S[i - 1][j] + S[i][j - 1] - S[i - 1][j - 1] + arr[i][j]; 
        }
    }

    while (q-- > 0)
    {
        int x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;
        cout << S[x2][y2] - S[x2][y1 - 1] - S[x1 - 1][y2] + S[x1 - 1][y1 - 1] << endl;
    }

    return 0;
}