[AcWing 798] 差分矩阵
2024-10-08 05:21:56
点击查看代码
#include<iostream>
using namespace std;
const int N = 1e3 + 10;
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()
{
int n, m, q;
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);
}
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];
for (int i = 1; i <= n; i ++) {
for (int j = 1; j <= m; j ++)
printf("%d ", b[i][j]);
printf("\n");
}
return 0;
}
- 注意插入函数的操作;
- 矩阵求前缀和;
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