what test case does my C++ code not cover?

Recently I was solving a problem on https://geeksforgeeks.org for a hiring contest. Here are the screenshots of this question : 1 2 3 . The code that i wrote (in C++) and tested on the coding site is :

#include <bits/stdc++.h>
using namespace std;
void fun()
{
    int i,n,j,q,sn=1;char x,y;string s;
    cin>>n>>q;
    int arr[26]={0};

    for(i=0;i<n-1;i++)
    cin>>x;//just skipping the n number of people from the standard input
    while(q--)
    {
        cin>>s>>x>>y;
        if(s=="addincircle")
        {
            if(arr[(int)(x-'a')]==0&&arr[(int)(y-'a')]==0)
            {
                arr[(int)(x-'a')]=sn; //if both the people haven't been added in any group they are given
                arr[(int)(y-'a')]=sn; //a new group number
                sn++;
            }
            else if(arr[(int)(x-'a')]==0)
                    arr[(int)(x-'a')]=arr[(int)(y-'a')];

            else if(arr[(int)(y-'a')]==0)
                    arr[(int)(y-'a')]=arr[(int)(x-'a')];
            else
            {
                j=arr[(int)(y-'a')];
                for(i=0;i<26;i++)
            {
                if(arr[i]==j) //in this case all the people in group no. of the second person are given 
                              //the group no that the first person is in
                arr[i]=arr[(int)(x-'a')];
            }
            }

        }
        else {  //this else is for the query - arewefriends
                if(arr[(int)(x-'a')]==arr[(int)(y-'a')]&&arr[(int)(x-'a')]&&arr[(int)(y-'a')])
                cout<<1<<endl;
              else cout<<0<<endl;
             }
    }


}

int main() {
    int t;
    cin>>t;
    while(t--)
    fun();
    return 0;
}

The logic that I have used is to create and mantain an array (arr) where the value at ith index represents a group no. (variable sn) in which the person is currently in (i.e. directly/indirectly connected) . Whenever there is an " addincircle " query we put all the people connected with the first and the second person in the same group i.e the array value of all the connected people is updated to a single number.

The code gives correct answer for the test cases in the screenshots above and also for the multiple test cases that I tested it with but on submitting the code it shows Wrong Answer . WHAT is it that I am missing?