shiroko2008 @ 2023-06-19 21:40:07
线段树一定要开4倍啊！！！
by Aisaka_Taiga @ 2023-06-19 21:52:45
@lzber 这好像是常识
by 沉石鱼惊旋 @ 2023-06-19 21:55:10
https://www.luogu.com.cn/discuss/531072 查理线段树