llm

they clearly want the performance - the algorithms (as you can easily see in the repo) are trivial, its just a huge amount of data to process

C++ can shine here - and still looking nearly like the go or Java-Code (due to the simple algorithm) but some one tried to write highly sophisticated code (there is no tutorial or book about C++ that teaches you to do it that way) with the result that C++ is far more slower then possible - we definitly not talking about 10% gain here

that is really not the case here - the Java and C++ implementatios are very plain boring algorithm code (some maps,lists,searching) non of the fancy language features are use to reduce or optimize the code - its absolutely not a C++-is-hard-to-get-right-thing

the C++ code is just using rarely used features in over-wild combinations - as stated: it seems that someone tried to port highly dynamic script code 1:1 to C++ without any knowledge about C++ and that just make no sense, even porting the current Java-Code 1:1 to plain old C++ Code would result in a much better performing version of the algorithm

everything (even the simplest stuff) is FORCED to be heap-allocated (with huge amount of code), in case of deque and shared_ptrs even double or tripple times - without any benefit of doing it

i would bet that a more clean, less every-feature-using version of the C++ algorithm would beat the Java, go code by a huge factor