Take a look at this submission in C++ 17: click here
Now take a look at this submission in C++ 20: click here
The only difference is the language version (C++ 17 vs C++ 20). Can MikeMirzayanov look into this? Mostly likely it's due to winlibs, but the compilation error is annoying nonetheless.
What do you expect from the inclusion of non-standard header files?
I expect the compiler to compile successfully when I include bits/extc++.h, just like bits/stdc++.h.
I see that you're including a non-standard header file in one of your submissions too: 103421748.