盲猜，越界了，换了个 inf 给 n
by yukimianyan @ 2021-12-05 16:27:37
@[yukimianyan](/user/509229) 谢谢巨佬
by Lazy_Labs @ 2021-12-05 16:28:48
蒟蒻的我没手写过堆，直接学的treap（手动狗头
by SZbr @ 2021-12-05 18:06:31