# Feedback for PTRLP problem

Problem Link: CodeChef: Practical coding for everyone

### Feedback

question is not clear what to achieve exactly.

@ramandwivedi
The question states that , u want to go around the world trip once and u can begin from any of the city .
U have initially empty tank the petrol available at the ith city is pi and the petrol required to go from ith to (i+1)th city is ci.
Your task is to find the city to begin with so that u can complete your world trip once.

``````#include <iostream>
using namespace std;

int main() {
int n;
cin>>n;
int a[n],b[n];
int ans=-1;
for(int i=0;i<n;i++)
{
cin>>a[i];
}
for(int i=0;i<n;i++)
{
cin>>b[i];
}
for(int i=0;i<n;i++)
{
if(a[i]>=b[i])
{
int sma=a[i];
int smb=b[i];
int j=(i+1)%n;
int ch=0;
while(j!=i)
{
sma+=a[j];
smb+=b[j];
//cout<<j<<endl;
//  cout<<sma<<" "<<smb<<endl;
if(sma<smb)
{
ch=1;
break;
}
j=(j+1)%n;
// cout<<j<<endl;
}
if(ch==1)
{
if(j<i)
{
break;
}
i=j;
}
else
{
ans=i;
break;
}
}
}
cout<<ans;
return 0;
}
``````

This is my code . Hope u will get the logic . I have done it in much simpler way.

1 Like