uva 10963 - The Swallowing Ground

 #include <iostream>
 #include <cstdio>
 #include <cstdlib>
 #include <set>
 using namespace std;

 int main()
 {
     int cases, cols, northRow, southRow;
     cin >> cases;
     while(cases--)
     {
         cin >> cols;
         set<int> mySet;
         for(int i=; i<cols; i++)
         {
             cin >> northRow >> southRow;
             mySet.insert(abs(northRow - southRow));
         }

         if(mySet.size() == )
             cout << "yes" << endl;
         else cout << "no" << endl;

         if(cases)
             cout << endl;
     }
 }

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