While solving Goodbye 2015, E i was getting TL on test 11. Now after the contest I decided to see what was the problem.

After some debugging I found that when you do lower bound on an empty set it gives TL:

http://codeforces.me/contest/611/submission/15127498 — AC
http://codeforces.me/contest/611/submission/15126396 — TL11

The only difference is ans if(s.size() == 0) break;

So I want to ask if there are similar issues with the std::set.