Process hung

when I run a program for school, unfortunately the process remains hanging, and the subsequent exercise doesn't work because it gives me an error like:

 d.exe: cannot open output file ExerciseName.exe: Permission denied

where ExerciseName is the program name that I am running 

the only solution found is to delete the ExerciseName application from the activity management panel
why does this problem arise? How can I avoid this in the future?

Among other things, all the exercises launched ended up with return code, zero, but why did the process hang again at a certain point? I didn't see any loops.

 

 

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