摘要： 二维线段树，用的树套树，在第一维每个节点上再建一个线段树，代码量加倍。code:#include<cstdlib>#include<cctype>#include<cstring>#include<cstdio>#include<cmath>#include<algorithm>#include<vector>#include<string>#include<iostream>#include<sstream>#include<set>#include<qu 阅读全文