Both std::map and std::unordered_map are slow, ,actually. See this discussion on StackOverflow: https://stackoverflow.com/q/42588264/1593077 https://stackoverf

Both std::map and std::unordered_map are slow, ,actually. See this discussion on StackOverflow: https://stackoverflow.com/q/42588264/1593077 https://stackoverflow.com/q/42588264/1593077