差分矩阵为b，原矩阵是a, 
1 对确定的i, j, 元素a[i][j]的值，等于b[x][y]的和, 其中1 <= x <= i; 1 <= y <= j
2 对确定的i, j, 执行b[i][j]+=c的意义是将a[x][y]全部加上c，其中i <= x <= n, j <= y <= m;

#include <iostream>
using namespace std;
const int s = 1e3+10;
int a[s][s], b[s][s];

void insert(int x, int y, int z, int w, int c) {
    b[x][y] += c;
    b[z+1][y] -=c;
    b[x][w+1] -=c;
    b[z+1][w+1] += c;
}

int main() {
    int n, m, q;
    cin >> n >> m >> q;
    for (int i = 1; i <= n; i++) 
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
        }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j<= m; j++)
            insert(i, j, i, j, a[i][j]);
    }
    while (q--) {
        int x, y, z, w, c;
        cin >> x >> y >> z >> w >> c;
        insert(x, y, z, w, c);
    }

    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++) {
            b[i][j] += b[i-1][j]  + b[i][j-1] - b[i-1][j-1];//前缀和
            cout << b[i][j] << ' ';
        }
        cout << endl;
    } return 0;
}