LiuQJun_271119 你的
`int mid = l + r >> 1;` l+r要扩起来
by da_ke @ 2023-09-24 19:48:09
类似的错误很多 @[LiuQJun_271119](/user/856179)
by da_ke @ 2023-09-24 19:48:49
@[WA_Coding_Duck](/user/766675) 没必要 这样不会导致 wa 但是看起来更严谨
by forgotmyhandle @ 2023-09-24 19:49:01
@[WA_Coding_Duck](/user/766675) 建议重新学习位运算优先级~
by onlyfiee @ 2023-09-24 19:49:57
build 函数的 if 里应该是 ```tr[x].sum = a[l];```
by hcng @ 2023-09-24 19:52:16
@[LiuQJun_271119](/user/856179) 你在建树的时候忘记把mul[i]设置1了
by da_ke @ 2023-09-24 19:52:21
@[WA_Coding_Duck](/user/766675) 其实有设
by hcng @ 2023-09-24 19:53:42
@[hcngdaniel](/user/382749) o,1
by da_ke @ 2023-09-24 19:54:43
https://www.luogu.com.cn/discuss/692715
by da_ke @ 2023-09-24 19:55:19
@[LiuQJun_271119](/user/856179) 建议在```pushdown```里面的乘法都模一下，虽然我不知道这会不会导致wa
by hcng @ 2023-09-24 19:55:49