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 - Серега и веселье 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?