补充：是求个数，不是求方案。
by Breath_of_the_Wild @ 2024-04-21 10:17:26
@[Breath_of_the_Wild](/user/964817)
P1637
by zjinze @ 2024-04-21 10:27:25
搞错了
by zjinze @ 2024-04-21 10:28:09
@[zjinze](/user/868864) 谢谢，反正都是差不多的
by Breath_of_the_Wild @ 2024-04-21 16:36:02