题目链接:uva 11605 - Lights inside a 3d Grid 题目大意:给定一个三维坐标系大小,每个位置有一个灯,初始状态为关,每次随机选中两个点,以这两点为对角线的长方体内所有灯转变状态。操作K次,问说平均情况下,最后会有多少栈灯亮着。 解题思路:枚举坐标系上的点,计算单个点亮着的概率,然后累加即使整体的期望。对于一个点x,y,z,分别考虑每维坐标系,例如x,选中的
题目描述 You are a fan of "Internet of Things"(IoT, 物联网), so you build a nice Internet of Lights and Switches in your huge mansion. Formally, there are n lights and m switches, each switch controls one
SummaryPriceInstallationReference Summary Bought the spot lights at TaoBao, replaced the old ones, and installed the new spot lights today at home. Price Refer to the TaoBao link 1 and 2.