I've been using this fast I/O library for a few times now. 323598048. But when I submit it to 782F - Axel and Marston in Bitland, with C++23 the code will just fall off at test 9. Even worse is that changing the parameters didn't help. C++20 works fine and I have tested it on my PC. Also it didn't work for 914F - Substrings in a String too: 323598468. I suspect this are related to death vectors, but I don't use cin, so it might not be related. Can anyone give me an insight? Maybe the I/O template I'm using has bugs?