@[youser](/user/388903) $n \leq 2^{40}$，请用数学方法
by Ryo_Yamada @ 2020-11-27 20:50:16
@[BreezeEnder](/user/242543) 大佬能看看模拟哪还能优化吗
by youser @ 2020-11-27 21:41:27
@[youser](/user/388903) 悄悄告诉你个事,有且只有完全平方数的因数个数为奇数个。
by __Chtholly @ 2021-01-10 22:10:54