摘要：Because of the huge population of China, public transportation is very important. Bus is an important transportation method in traditional public tran 阅读全文

摘要：Problem DescriptionOne day , Kiki wants to visit one of her friends. As she is liable to carsickness , she wants to arrive at her friend’s home as soo 阅读全文

摘要：Problem Description某省自从实行了很多年的畅通工程计划后，终于修建了很多路。不过路多了也不好，每次要从一个城镇到另一个城镇时，都有许多种道路方案可以选择，而某些方案要比另一些方案行走的距离要短很多。这让行人很困扰。 现在，已知起点和终点，请你计算出要从起点到终点，最短需要行走多少距 阅读全文