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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin>>n;
  7. 	vector<int> arr;
  8. 	int element;
  9. 	for(int i=0;i<n;i++)
  10. 	{
  11. 		cin>>element;
  12. 		arr.push_back(element);
  13. 	}
  14. 	int p1_score=0, p2_score=0;
  15. 	bool turn=1;
  16. 	bool reversed = false;
  17. 	int start=0, end=n-1;
  18. 	while(start <= end)
  19. 	{
  20. 		if(turn)
  21. 		{
  22. 			if(reversed){
  23. 				p1_score+=arr[end];
  24. 				end--;
  25. 			} 
  26. 			else{
  27. 				p1_score+=arr[start];
  28. 				start++;
  29. 			}
  30. 			turn=0;
  31. 		}
  32. 		else
  33. 		{
  34. 			if(reversed){
  35. 				p2_score+=arr[end];
  36. 				end--;
  37. 			} 
  38. 			else{
  39. 				p2_score+=arr[start];
  40. 				start++;
  41. 			}
  42. 			turn=1;
  43. 		}
  44. 	}
  45. 	cout<<p1_score-p2_score;
  46.     return 0;
  47. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/urRGk2
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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