二维前缀和 转移方程: 1f[i][j]−f[i−1][j]−f[i][j−1]+f[i−1][j−1] #模板 #formwork 二维前缀和 http://example.com/2022/01/29/二维前缀和/ Author John Doe Posted on January 29, 2022 Licensed under Codeforces Round 770 (Div.2) C.OKEA Previous 2022牛客寒假算法基础集训营3 C 智乃买瓜(another version) Next