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When can 'Ofast' optimization bring negative optimization
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 455D - Serega and Fun with fhq-treap, And I submitted two submissions: 58122597 and 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?
| Rev. | Lang. | By | When | Δ | Comment | |
|---|---|---|---|---|---|---|
| en3 |
|
AcceptedIsRealAbility | 2019-08-01 15:10:59 | 1 | Tiny change: 'he problem[problem:4' -> 'he problem [problem:4' | |
| en2 |
|
AcceptedIsRealAbility | 2019-08-01 15:10:30 | 18 | ||
| en1 |
|
AcceptedIsRealAbility | 2019-08-01 15:09:45 | 579 | Initial revision (published) |
