1BRC with C++

[csantv]

Found this challenge and gave it a try with modern C++20. In order to use the complete standard, OneTBB is required under linux.

https://github.com/csantv/1brc-cpp/blob/master/src/main.cpp

Can get 9 seconds on my 5950x, only requires ~16GB of ram, 12 of those being the input file loaded to memory.