For loop not working in a C++ method

I am preparing for a technical assessment by a company using condingame as the platform. The tutorial asks to write the method of class (C++) to check if a number is present in an array. In the method whenever I use: for(int i=0;i<size;i++) it gives an error saying the program is not returning anything. I even tried simple stuff like for (int i=0;i<5;i++) {return true;} but still not working! any idea!

You probably want some kind of if statement

Don’t return, use cout to write to console, or printf or whatever.
Answers are read from console not return.

For a real technical assessment, i believe the wanted response is using count_if.

what is the real task description?
probably u didnt understand conditions.
how u receive array?
how u should return result?

at CodinGame u get the data from stdin(C scanf, C++ cin) and should print results to stdout(C printf, C++ cout).
stderr(C++ cerr) used for logging/debugging - u can print to the one anything what u want, CG ignoring it.

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