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查询Tags标签: Removal,共有 2条记录-
cousin
Commonly "cousin" refers to a "first cousin", a relative whose most recent common ancestor with the subject is a grandparent. More generally, in the lineal kinship system used in the English-speaking world, a cousin is a type of fa…
2022/8/25 23:27:57 人评论 次浏览 -
【二维差分】2018-2019ICPC焦作J - Carpets Removal
关键 易错 【二维前缀和&差分】 前缀和: sum[i][j] = sum[i-1][j] + sum[i][j-1] - sum[i-1][j-1] + a[i][j] 差分操作: a[x1][y1]++; a[x1][y2+1]--; a[x2+1][y1]--; a[x2+1][y2+1]++; p.s. 可用同一个数组【题目描述】 Problem - J - Codeforces【题解】 利…
2022/1/30 6:07:59 人评论 次浏览