摘要：描述 给定一个整数 M，对于任意一个整数集合 S，定义“校验值”如下: 从集合 S 中取出 M 对数(即 2∗M 个数，不能重复使用集合中的数，如果 S 中的整 数不够 M 对，则取到不能取为止)，使得“每对数的差的平方”之和最大，这个最大值 就称为集合 S 的“校验值”。 现在给定一个长度为 N 阅读全文

摘要：In Programming Land, there are several pathways called Philosopher’s Walks for philosophers to have a rest. A Philosopher’s Walk is a pathway in a squ 阅读全文

摘要：BaoBao and DreamGrid are playing a game using a strange button. This button is attached to an LED light (the light is initially off), a counter and a 阅读全文

摘要：Trace There's a beach in the first quadrant. And from time to time, there are sea waves. A wave ( xxx , yyy ) means the wave is a rectangle whose vert 阅读全文