The Perfect Stall Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 20874 Accepted: 9421 Description Farmer John completed his new barn just last week, complete with all the latest milking technology. Unfortunately, due to engineering pr…
题意:题目大意:有N个点,给出从a点到b点的距离,当然a和b是互相可以抵达的,问从1到n的最短距离 poj2387 Description Bessie is out in the field and wants to get back to the barn to get as much sleep as possible before Farmer John wakes her for the morning milking. Bessie needs her beauty sleep, s…
先给出题面:https://vjudge.net/problem/UVA-558 题意描述:给你含n个点以及m条边的图,让你判断在这个图中是否存在负权回路. 首先,我们来介绍什么是SPEA算法 SPFA算法是求解单源最短路径问题的一种算法,由理查德·贝尔曼(Richard Bellman) 和 莱斯特·福特 创立的.有时候这种算法也被称为 Moore-Bellman-Ford 算法,因为 Edward F. Moore 也为这个算法的发展做出了贡献.它的原理是对图进行V-1次松弛操作,得到所有可…