get_phi_prime_mu_in_linear_time
好像之前说过sqrt(n)求phi(n)没用？
ps:之前好像说必须先O(n)筛出素数？现在发现好像不需要QAQ（模板参考BZOJ_2705）
现在发现这货好像有用QAQ,比如BZOJ_2705
话说那题真的是好丧心病狂QAQ特别是那个DFS的version
get_phi_prime_mu_in_linear_time
好像之前说过sqrt(n)求phi(n)没用？
ps:之前好像说必须先O(n)筛出素数？现在发现好像不需要QAQ（模板参考BZOJ_2705）
现在发现这货好像有用QAQ,比如BZOJ_2705
话说那题真的是好丧心病狂QAQ特别是那个DFS的version
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