题目链接：http://exam.upc.edu.cn/problem.php?id=5155题目：题目描述You are in charge of the security for a large building. The building has a map, consisting of rooms, and doors between the rooms. Each door has...
题目链接：http://codeforces.com/gym/101635/attachments题目：题目描述As Jacques-Édouard really likes birthday cakes, he celebrates his birthday every hour, instead of every year. His friends ordered him a round...
题目链接：http://codeforces.com/gym/101635/attachments题目：题目描述The chef of a restaurant aspiring for a Michelin star wants to display a selection of her signature dishes for inspectors. For this, she has ...
题目链接：http://exam.upc.edu.cn/problem.php?id=5124题目：题目描述Flow Free is a puzzle that is played on a 2D grid of cells, with some cells marked as endpoints of certain colors and the rest of cells being b...