P3834【模板】可持久化线段树2-洛谷|计算机科学教育新生态(luogu.com.cn)#include<bits/stdc++.h>usingnamespacestd;usingi64=longlong;template<classNode>structPersidentSegmentTree{#definelc(u)tr[u].l#definerc(u)tr[u].r#definesum(u)t