static void Main()
{
PetrolDistance[] p=new PetrolDistance[3];
p[0]=new PetrolDistance(6,4);
p[1]=new PetrolDistance(3,6);
p[2]=new PetrolDistance(7,3);
int start=PetrolPumpNumber(p,3);
if(start==-1)
{
Console.WriteLine("No");
}
else
{
Console.WriteLine(start);
}
}
static int PetrolPumpNumber(PetrolDistance[] p,int n)
{
int start=0;
int end=1;
int current=p[start].petrol-p[start].distance;
while(start !=end || current<0)
{
while(current<0 && start !=end)
{
current=current-(p[start].petrol-p[start].distance);
start=(start+1)%n;
if(start==0)
return -1;
}
current=current+p[end].petrol-p[end].distance;
end=(end+1)%n;
}
return start;
}
