为什么快读，cin(取消同步)不行，三个TLE，scanf就AC，蒟蒻の不解

#include<iostream>
#define N 10005
using namespace std;
int n,m,fa[N],Rank[N];
inline int read(){
    int x=0,f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
    while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
inline int find(int x){
    return fa[x]==x?x:(find(fa[x]));
}
void merge(int x,int y){
    int a=find(x),b=find(y);
    if(Rank[a]>Rank[b])
    {
        fa[b]=a;
        Rank[a]+=Rank[b];
    }
    else
    {
        fa[a]=b;
        Rank[b]+=Rank[a];
    }
} 
int main()
{
    n=read();m=read();
    for(int i=1;i<=n;i++)fa[i]=i,Rank[i]=1;
    for(int i=1,z,x,y;i<=m;i++)
    {
        z=read();x=read();y=read();
        if(z==1)merge(x,y);
        else find(x)==find(y)?cout<<"Y"<<endl:cout<<"N"<<endl;
    }
    return 0;
}