When can 'Ofast' optimization bring negative optimization
Difference between en2 and en3, changed 1 character(s)
We all know that this line in C++`#pragma GCC optimize("Ofast")`↵
can optimize most programs.↵
↵
But specially, the accident(maybe?) happens on me.↵
↵
Today, I was solving the problem [problem:455D] with fhq-treap, And I submitted two submissions: ↵
[submission:58122597] and [submission:58123225], when first one got AC with no optimization, and the second with 'Ofast' optimization got TLE on test 25.↵
↵
So I just want to know what kind of programs the 'Ofast' optimization can bring negative optimization?

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en3 English AcceptedIsRealAbility 2019-08-01 15:10:59 1 Tiny change: 'he problem[problem:4' -> 'he problem [problem:4'
en2 English AcceptedIsRealAbility 2019-08-01 15:10:30 18
en1 English AcceptedIsRealAbility 2019-08-01 15:09:45 579 Initial revision (published)