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  1.  #include <bits/stdc++.h>
  2. using namespace std;
  3. #define lli long long int
  4. #define mp(a,b) make_pair(a,b)
  5. #define pb(a) push_back(a)
  6. #define fr(i,n) for(i=0;i<n;i++)
  7. #define F first
  8. #define S second
  9. #define fast std::ios_base::sync_with_stdio(false)
  10. #define mod 1000000007
  11. #define pi 3.14159265
  12. int main() {
  13. 	fast;
  14. 	lli n,k;
  15. 	cin>>n>>k;
  16. 	lli a[n],i;
  17. 	fr(i,n)
  18. 	{
  19. 		cin>>a[i];
  20. 	}
  21. 	double b[n],sum=0,ans=0;
  22. 	fr(i,n)
  23. 	{
  24. 		b[i]=(float)(a[i]+1)/2;
  25. 	}
  26. 	fr(i,k)
  27. 	{
  28. 		sum+=b[i];
  29. 	}
  30. 	ans=sum;
  31. 	for(i=k;i<n;i++)
  32. 	{
  33. 		sum-=b[i-k];
  34. 		sum+=b[i];
  35. 		ans=max(ans,sum);
  36. 	}
  37. 	cout<<fixed<<setprecision(8)<<ans;
  38.  
  39. 	return 0;
  40. }
Runtime error #stdin #stdout 0s 4556KB
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https://ideone.com/QofY1S
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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