数据是不是太弱了?

#include<bits/stdc++.h>
using namespace std;
const int N=3e5+10;
int a[N],js[N];
int dist[N];
int find(int x){
    if(x!=a[x]){
        int fa=find(a[x]);
        dist[x]+=dist[a[x]];
        a[x]=fa;
    }
    return a[x];
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);cout.tie(nullptr);
    int t;
    cin>>t;
    for(int i=0;i<=N-9;i++){
        js[i]=1;    
        dist[i]=0;
        a[i]=i;
    }
    while(t--){
        string s;
        int x,y;
        cin>>s>>x>>y;
        int fx=find(x),fy=find(y);
        if(s[0]=='M'){
            dist[fx]+=js[fy];
            a[fx]=fy;
            js[fy]+=js[fx];
            js[fx]=0;
        }else{
            if(fx==fy) cout<<abs(dist[x]-dist[y])-1<<endl;
            else cout<<-1<<endl;
        }
    }    
}