表示把样例粘本地能对然而vj自测都是WA？？？
喵喵喵？？？

#include <cstring>
#include <iostream>
#include <cstdio>
using namespace std;
const int N = 33000;
int x,y,t;
int num[N],dis[N],f[N];

int ser(int x){
    if (x==f[x]) return x;
    int r=ser(f[x]);
    dis[x] += dis[f[x]];
    return f[x] = r;
}

void merge(int x, int y){
    int fx = ser(x);
    int fy = ser(y);
    f[fx] = fy;
    dis[fx] = num[fy];
    num[fy]+=num[fx];
    return ;
}

void ques(int x,int y){
    int fx = ser(x);  int fy = ser(y);
    if(fx!=fy){
        printf("-1\n");
        return;
    }
    if(dis[x]>=dis[y]) printf("%d\n",dis[x]-dis[y]-1);
    else printf("%d\n",dis[y]-dis[x]-1);
    return ;
}

int main(){
    //freopen("universe.in", "r", stdin);
    //freopen("test.out", "w", stdout);
    cin >> t;
    memset(dis, 0, sizeof dis);
    for (int i=1; i<=N; ++i) 
        num[i] = 1, f[i] = i;
        for(int i=1;i<=t;i++)
        {
            char c=getchar();
            while(c!='M'&&c!='C')c=getchar();
            scanf("%d%d",&x,&y);
            if(c=='M')
            {
                merge(x,y);
                continue;
            }
            ques(x, y);
        }
        return 0;
    }