Stuff relating to c++ is gone

My laptop updated on 14th of November and after booting it and launching CLion (software i use to code in c++) it gives an error that the compiler as well as libraries are missing.

By compiler i mean the "c++" file in "/usr/bin", and the missing libraries are for example "iostream" or "string", which were located either in "/usr/include" or "/usr/lib/gcc" (idk where exactly). Everything regarded plain C is still in place, the compilator "cc" in "/usr/bin" and its libraries.
Additionally, the "g++" command is not found, while "gcc" works.

For what I know the /usr directory is read-only, so I wonder how could those files be gone.
Sorry if this is not the right place to issue this problem, but searching the web gave me no explanation.
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