摘要：
Let’s call an undirected graph G=(V,E)relatively prime if and only if for each edge (v,u)∈E GCD(v,u)=1 (the greatest common divi... 阅读全文
摘要：
Alice got an array of length nn as a birthday present once again! This is the third year in a row!And what is more disappointing,... 阅读全文