Coodechef Root of the Problem Problem Code: TREEROOT solution

Solution in C++:
///**********ALLAH IS ALMIGHTY************///
///AH Tonmoy
///Department of CSE,23rd batch
///Islamic University,Bangladesh

#include<iostream>
using namespace std;
int main()
{
    int n,a,b,t1,b1,t;
    cin>>t;
    while(t--)
    {
        t1=0,b1=0;
        cin>>n;
        while(n--)
        {
            cin>>a>>b;
            t1=t1+a;
            b1=b1+b;
        }
        cout<<t1-b1<<endl;
    }
    return 0;
}