My code ;

#include <bits/stdc++.h>
using namespace std ;

void solve ()
{
    int n , x;
    cin>>n>>x;
   
 vector <pair<int,int>> points ;
 
  for (int i = 0 ; i < n ; i++)
  {
      int a , b;
      cin>>a>>b;
      points.push_back(make_pair(a , b));
      
  }
  
  int mini = INT_MIN;
  int maxi = INT_MAX;
  
  
  for (auto &it : points)
  {
      int left = min (it . first , it.second);
      int right = max(it.first , it.second);
      mini = max (mini , left );
      maxi = min(maxi , right );
      
  }

    
if (mini <= maxi)
{
    if (x >= mini && x <= maxi)
    {
        cout <<0<<"\n";
        return;
        
    }
    else 
    {
        cout <<min(abs(x - mini), abs(x - maxi)) << "\n";  
        return ;
        
    }
}

else 
{
    cout << -1<<"\n";
   
    
}
  
   return ;

    
}


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

Don't know why the online compiler isn't showing any output, and also there was a code that i came across and the same problem happened again, the online compiler wasn't showing any output for that code too.

Here's the code of that person that i came across ;

#include <bits/stdc++.h>
using namespace std;
int n,x,L,R=1000;
int main(){
cin>>n>>x;
for(int a,b;cin>>a>>b;){
if(a>b)swap(a,b);
L=max(L,a),R=min(R,b);
}
cout<<(L>R?-1:L<=x&&R>=x?0:L>x?L-x:x-R);
}

I understood the code but couldn't understand why these codes show no output on the compiler ?