How to add (window.h) or similar header file in sololearn code playground???

Question

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Answer 1

First You have to make a cpp file with no code then copy and paste 'window.h' file in sololearn code playground then in another cpp file
and writing #include 'window.h' and it will work.

Answer 2

I think not possible here. windows.h works on windows environment SoloLearn runs on Linux servers..
SoloLearn compilers not support some headers and graphic contents.. because of server limitations...