p2868专题

洛谷 P2868 观光奶牛Sightseeing Cows 01分数规划 + 最短路判负环

按照惯例,不想写题目大意,转一个 https://blog.csdn.net/liangzihao1/article/details/79716799 题目描述 Farmer John has decided to reward his cows for their hard work by taking them on a tour of the big city! The cows mu