题目链接：POJ2524【UbiquitousReligions】思路    经典并查集模板，求集合个数。代码#include<iostream>usingnamespacestd;#definelllonglongconstintN=5e5+10;intfa[N];intn,m;voidinit(intn){for(inti=1;i<=n;i++){f