SPOJ PGCD 4491. Primes in GCD Table && BZOJ 2820 YY的GCD （莫比乌斯反演）
摘要：
4491. Primes in GCD TableProblem code: PGCDJohnny has created a table which encodes the results of some operation -- a function of two arguments. But instead of a boring multiplication table of the sort you learn by heart at prep-school, he has created a GCD (greatest common divisor) table! So he no 阅读全文
posted @ 2013-10-19 22:49 kuangbin 阅读(2547) 评论(0) 推荐(0) 编辑
