Commenting to add that /[ЁА-яё]+/ follows Unicode code point order, which makes it very nice for (Unicode-aware) programmers to work with. — haley 28 secs ago

Software Recommendations — user16217248 27 secs ago

How to ask homework question and Open letter to students with homework problems — Barmar 43 secs ago

Honestly, I see very little utility in this for serious C++ programmers. Your container is private, but there are multiple member functions that only std::map has that std::vector does not have that the programmer may want to use but can't use due to not being able to access the underlying container. — PaulMcKenzie 5 secs ago

I'm trying to help you, not argue. I am a volunteer - I don't get paid, but have assisted 14 million programmers in the last 10 years. The site requires and expects people to provide minimal reproducible example so answerers don't waste their time guessing what askers mean, or trying to find datasets. That's how it works. If you would like folks to help you, it's generally a good idea to make it easy for them. — Mark Setchell 15 secs ago