摘要：
Description 今天的数学课上，Crash小朋友学习了最小公倍数(Least Common Multiple)。对于两个正整数a和b，LCM(a, b)表示能同时被a和b整除的最小正整数。例如，LCM(6, 8) = 24。回到家后，Crash还在想着课上学的东西，为了研究最小公倍数，他画了 阅读全文
摘要：
Each New Year Timofey and his friends cut down a tree of n vertices and bring it home. After that they paint all the n its vertices, so that the i-th 阅读全文