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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7. 	long long n;
  8. 	cin >> n;
  9.  
  10. 	long long k = 1;
  11.  
  12. 	long long left = 1;
  13. 	long long right = ceil((float)n / 2);
  14.  
  15. 	while (left < right) {
  16. 		k = (left + right) / 2;
  17.  
  18. 		long long m = n;
  19. 		long long days = 0;
  20.  
  21. 		while (m) {
  22. 			if (m < k) {
  23. 				break;
  24. 			} else {
  25. 				m -= k;
  26. 				days++;
  27.  
  28. 				long long pet = m / 10;
  29. 				m -= pet;
  30. 			}
  31. 		}
  32.  
  33. 		if (k * days + m >= ceil((float)n / 2)) {
  34. 			right = k;
  35. 		} else {
  36. 			left = k + 1;
  37. 		}
  38. 	}
  39.  
  40. 	cout << right << endl;
  41.  
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 4296KB
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stdout
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https://ideone.com/0yOgFI
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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