摘要：
C - 3 CodeForces - 580A Kefa decided to make some money doing business on the Internet for exactly n days. He knows that on the i-th day (1 ≤ i ≤ n) h 阅读全文
摘要：
C - 3 CodeForces - 580... 阅读全文
摘要：
B - 2 CodeForces - 69AA guy named Vasya attends the final grade of a high school. One day Vasya decided to watch a match of his f... 阅读全文
摘要：
C - 3 CodeForces - 271AIt seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the fi... 阅读全文
摘要：
D - 4 CodeForces - 337AThe end of the school year is near and Ms. Manana, the teacher, will soon have to say goodbye to a yet ano... 阅读全文