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随笔分类 -  其他——莫队

Problem B. Harvest of Apples(莫队+数学）
摘要：Problem Description There are n apples on a tree, numbered from 1 to n.Count the number of ways to pick at most m apples. Input The first line of the 阅读全文
posted @ 2019-08-03 10:21 Through_The_Night 阅读(178) 评论(0) 推荐(0)