LIFT REQUESTS - LIFTME CodeCHEF Easy Question

Welcome back to my blog .

Here is a link to the PROBLEM

We just need to find the number of floors the lift travelled . So just compute modulus of b-a for all queries and add them to the sum .

Just take a look at the following C++ code :-

#include <iostream>

using namespace std;

int main() {

    int t;

    cin>>t;

    while(t--)

    {

        long long int n;

        long long int q;

        cin>>n;

        cin>>q;

        long int i=0;

        unsigned long long int ans=0;

        long long int f,d,prev=0;

        

        while(i!=q)

        {

            cin>>f>>d;

            ans=ans+abs(f-prev);

            ans=ans+abs(d-f);

            prev=d;

            i++;

        }

        cout<<ans<<endl;

    }

// your code goes here

return 0;

}

Please understand this and leave your doubts in the comments section .