摘要：
Vladik had started reading a complicated book about algorithms containing n pages. To improve understanding of what is written, his friends advised hi 阅读全文
摘要：
This is an interactive problem. In the output section below you will see the information about flushing the output. On Sunday Leha the hacker took Nur 阅读全文
摘要：
Summer holidays! Someone is going on trips, someone is visiting grandparents, but someone is trying to get a part-time job. This summer Noora decided 阅读全文