View Code of Problem 6

#include <iostream>
#include<algorithm>
using namespace std;
int main()
{

    int t,n,l,r;
    cin>>t;
    while(t--)
    {

        int f=1;
        cin>>n;
        int i;
        cin>>l>>r;
        int s=r-l;
        for(i=2;i<=n;i++)
        {
            cin>>l>>r;
            if(r-l!=s) {f=0;break;}
        }
        if(f) cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
    }
    return 0;
}

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