OCP(open close principle)

Question

Ocp
https://sololearn.com/compiler-playground/cAF4AT363aqt/?ref=app

Answer 1

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Reported as off-topic.

https://www.sololearn.com/discuss/3021159/?ref=app
https://sololearn.com/compiler-playground/Wek0V1MyIR2r/?ref=app
https://sololearn.com/compiler-playground/W3uiji9X28C1/?ref=app
https://sololearn.com/compiler-playground/W0uW3Wks8UBk/?ref=app