P2068统计和思路单点修改+区间查询线段树/树状数组板子题代码#include<bits/stdc++.h>#defineendl'\n'#defineintlonglong#definelowbit(x)x&-xconstintmaxn=5e5+5;constintinf=0x7f7f7f7f;structcustom_hash{ staticuint64_tsplitmix64