上来就想直接二维树状数组怎么办......
by 2xyz @ 2020-10-06 09:38:26
我也事啊
by zhangjiting @ 2023-02-20 19:01:58
@[p9t6g](/user/23771) 我也事这么想的，而为线段树打不出来（悲
by _AyachiNene @ 2023-02-20 19:02:25