add函数改成void，要不没返回值有锅
by lyc1001 @ 2023-01-20 23:24:30
@[鲨齿渊虹](/user/462965)
by lyc1001 @ 2023-01-20 23:24:39
《02》
by cff_0102 @ 2023-01-21 01:28:12
UB.
by Sktic @ 2023-01-21 08:37:38
开 O2 后非 `void` 函数无返回值就会这样
by Sprague_Garundy @ 2023-01-21 08:46:49
改成 inline void add
by ACPC @ 2023-01-21 08:58:20