值域大了要转`long double`，春测好像就卡了 `double` 的 `sqrt`
by Transparent @ 2023-07-19 23:15:30
@[Transparent](/user/180576) \BX
NOI RP++!
by 野生林登万 @ 2023-07-23 20:03:03
@[野生林登万](/user/369942) \bx
by Transparent @ 2023-07-23 21:04:44