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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. ll clas[10000];
  5. ll ciel(float a)
  6. {
  7. 	ll t=a;
  8. 	if(t!=a)
  9. 	t++;
  10. 	return t;
  11. }
  12. int main()
  13. {
  14. 	ios::sync_with_stdio(0);
  15. 	ll n,b;
  16. 	cin>>n>>b;
  17. 	ll l=1,r=0;
  18. 	for(int i=0;i<n;i++)
  19. 	{
  20. 		cin>>clas[i];
  21. 		r=max(r,clas[i]);
  22. 	}
  23. 	if(b<n)//number of cakes is less than number of classes
  24. 	{
  25. 		cout<<"-1";
  26. 		return 0;
  27. 	}
  28. 	//binary search on "maximum number of students " who will share a cake
  29. 	while(l<r)
  30. 	{
  31. 		ll mid=(l+r)/2;
  32. 		ll cakes_req=0;
  33. 		for(int i=0;i<n;i++)
  34. 		{
  35. 			cakes_req+=ciel((clas[i]/(float)mid));
  36.  
  37. 		}
  38. 		if(cakes_req<=b)
  39. 		{
  40. 			r=mid;
  41. 		}
  42. 		else
  43. 		{
  44. 			l=mid+1;
  45. 		}
  46. 	}
  47. 	cout<<r;
  48. }
Success #stdin #stdout 0s 4304KB
comments (?)
stdin 
8 17
3 5 2 6 5 10 7 4
stdout 
3
https://ideone.com/Jrj3hz
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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