摘要：
1045 Favorite Color Stripe （30 分）Eva is trying to make her own color stripe out of a given one. She would like to keep only her favori... 阅读全文
摘要：
1034 Head of a Gang （30 分）One way that the police finds the head of a gang is to check people's phone calls. If there is a phone call... 阅读全文