How to improve performance of std::unordered_map

Revision en2, by AnotherRound, 2016-05-06 12:33:26

After getting TLE on test 132 for problem C on CF #350, I tried to optimise. I was surprised when I got AC, because the only thing I needed to change was to replace std::unordered_map with std::map. Does anyone have ideas what causes the different performance? I expected that unordered_map should be faster that map, but it is not the case. And also, is there a way to speed up unordered_map? Here are both submissions:

AC — map:

TLE — unordered_map:

Tags map, unordered_map


  Rev. Lang. By When Δ Comment
en2 English AnotherRound 2016-05-06 12:33:26 52
en1 English AnotherRound 2016-05-06 12:29:29 575 Initial revision (published)