摘要: The harmonic value of the permutation p1,p2,⋯pn is ∑i=1n−1gcd(pi.pi+1) Mr. Frog is wondering about the permutation whose harmonic value is the strictl 阅读全文
posted @ 2017-08-25 17:19 Asimple 阅读(230) 评论(0) 推荐(0)