另外,记得开```long long```如果RE了:检查 树状数组大小 是不是 叶子数 的四倍
by Horbson @ 2023-10-13 14:07:18
%%%
by Addrian @ 2023-10-17 08:32:31
**thanks**
by 代码小明 @ 2023-10-17 17:43:20