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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6.  
  7. 	int x; cin >> x;
  8. 	vector<long long> v;
  9. 	int increasing = 1;
  10. 	long long prev = 0;
  11. 	long long peak = 0;
  12. 	long long lowestl = 0;
  13. 	long long hi = 0;
  14. 	while(x--) {
  15. 		long long y; cin>> y;
  16. 		v.push_back(y);
  17. 	}
  18. 	prev = v[0];
  19. 	lowestl = v[0];
  20.  
  21. 	for(int i = 1; i < v.size(); i++) {
  22. 		//cout << lowestl << " " << v[i] << endl;
  23. 		if(increasing) {
  24. 			if(v[i] >= prev) {
  25. 				peak = v[i];
  26. 			} else {
  27. 				increasing = 0;
  28. 				hi = max(hi, (long long) min(peak-lowestl, peak-v[i]));
  29. 			}
  30. 		} else {
  31. 			if(v[i] < prev) {
  32. 				// long long mi = min(peak-lowestl)
  33. 				hi = max(hi, (long long) min(peak-lowestl, peak-v[i]));
  34. 			} else {
  35. 				increasing = 1;
  36. 				peak = v[i];
  37. 				lowestl = prev;
  38. 			}
  39. 		}
  40. 		prev = v[i];
  41.  
  42. 	}
  43. 	cout << hi << endl;
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0.01s 5380KB
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https://ideone.com/DSTHCQ
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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