视频链接： P5631最小mex生成树-洛谷|计算机科学教育新生态(luogu.com.cn)//线段树分治O(nlognlogw)#include<iostream>#include<cstring>#include<algorithm>#include<vector>usingnamespacestd;#definels(u<<1)#definers(u<<1|1)#d