摘要：
The sequence of integers a1,a2,…,aka1,a2,…,ak is called a good array if a1=k−1a1=k−1 and a1>0a1>0. For example, the sequences [3,−1,44,0],[1,−99][3,−1 阅读全文
摘要：
Your friend is developing a computer game. He has already decided how the game world should look like — it should consist of nn locations connected by 阅读全文