I don't know much about compilers. So I'm interested in hearing from those in the know. Why is avx2 no longer available in the new C++20 compiler on Codeforces?
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There has been some post about this (forgot link); basically you need to do the
#pragma GCC targets after you include STL headers. The headers don't work nicely with AVX.Relevant blog
It's a bug introduced in gcc 13. Bugzilla post