题目链接:Codeforces;洛谷。 一道初看无从下手的题,转化后成了板子的好题。 题意简述 n个结点的无向带权图上,一个机器人在游走,它有一个容量为c的电池,即任何时刻电量x∈[0,c]。经过边权为w的边会消耗w的电量。1…k为充电中心,在充电中心机器人能将电充满。 有q次询问,问从u至v电池容量至少为多少。
【CF1253F】Cheap Robot(最小生成树,最短路) 首先发现所有询问点都是充电桩这个条件很有用。 它能滋生出一种暴力到极端的想法:用 Floyd 对全局跑一遍最短路。然后新建一个图,图中两两充电桩连一条边,边权为它们之间的最短路,代表着从这个充电桩直接走到那个充电桩最少要备多少电。然后再把新图的最小生成树...
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