[模板] 并查集

#include<iostream>
#include<cstring>
#include<cstdio>
#define MAXN 300000
using namespace std;

int n,m;
int fa[MAXN];

int fnd(int x){
if(x!=fa[x]) return fa[x]=fnd(fa[x]);
return x;
}
void cat(int x,int y){
x=fnd(x);y=fnd(y);
if(x!=y) fa[y]=x;
}

int main(){
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++) fa[i]=i;
int z,x,y;
for(int i=1;i<=m;i++){
scanf("%d%d%d",&z,&x,&y);
if(z==1) cat(x,y);
else {
if(fnd(x)==fnd(y)) printf("Y\n");
else printf("N\n");
}
}
return 0;
}