2023-8-15差分矩阵

题目链接：差分矩阵

#include <iostream>using namespace std;const int N = 1010;int n, m, q;
int a[N][N], b[N][N];void insert(int x1, int y1, int x2, int y2, int c)
{b[x1][y1] += c;b[x1][y2 + 1] -= c;b[x2 + 1][y1] -= c;b[x2 + 1][y2 + 1] += c;
}int main()
{scanf("%d%d%d", &n, &m, &q);for(int i = 1; i <= n; i ++)for(int j = 1; j <= m; j ++)scanf("%d", &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 x1, y1, x2, y2, c;scanf("%d%d%d%d%d", &x1, &y1, &x2, &y2, &c);insert(x1, y1, x2, y2, c);}// 构造前缀和for(int i = 1; i <= n; i++)for(int j = 1; j <= m; j ++)b[i][j] += b[i][j - 1] + b[i - 1][j] - b[i - 1][j - 1];for(int i = 1; i <= n; i ++){    for(int j = 1; j <= m; j++) printf("%d ", b[i][j]);puts("");}        return 0;
}