摘要：
The time of a dayProblem DescriptionThere are no days and nights on byte island, so the residents here can hardly determine the length of a single day... 阅读全文
摘要：
BombingProblem DescriptionIt’s a cruel war which killed millions of people and ruined series of cities. In order to stop it, let’s bomb the opponent’s... 阅读全文
摘要：
Unlock the Cell PhoneProblem DescriptionModern high-tech cell phones use unlock patterns to unlock the system. The pattern is usually a 3*3 dot array.... 阅读全文