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  1. /**
  2.  * Petrol Pump Problem
  3.  * @author Prateek
  4.  */
  5.  class PetrolPump {
  6. 	/**
  7. 	 * Get the Starting Point of the Circular Trip
  8. 	 * @return index of the petrol pump if solution exist ,
  9. 	 *           else -1 if solution doesnt exist
  10. 	 */
  11. 	public static int getStartIndex(int[] dist , int[] petrol){
  12.  
  13. 		int nPumps= petrol.length;
  14. 		int start , currentPetrol;
  15. 		int i=start=0;
  16.  
  17. 		while(start < nPumps)
  18. 		{
  19. 			currentPetrol= petrol[i] - dist[i] ;
  20.  
  21. 			while(currentPetrol >= 0)	{
  22.  
  23. 				i= (i+1) % nPumps ;
  24.  
  25. 				currentPetrol += petrol [i] - dist[i] ;
  26.  
  27. 				if(i==start)
  28. 					return start;
  29. 			}
  30.  
  31. 			start = ++i ;
  32. 			i= i % nPumps ;
  33. 		}
  34. 		return -1;
  35. 	}
  36.  
  37. 	public static void main(String[] args) {
  38. 		int [] dist =  {4, 7, 4, 8, 4, 1};
  39. 		int [] petrol =  {3, 5, 3, 8, 3, 6};
  40.  
  41. 		int index= getStartIndex(dist, petrol);
  42.  
  43. 		if(index == -1)
  44. 			System.out.println("Solution Does not exist");
  45. 		else
  46. 			System.out.println("Petrol Pump Number : " +(index + 1));
  47. 	}
  48. }
  49.  
Success #stdin #stdout 0.06s 380160KB
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Petrol Pump Number : 6
https://ideone.com/1gV7KO
language:
Java (12.0.1)
created:
10 years ago
visibility:
secret

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