Compilare: main.cpp: In function 'bool prim()': main.cpp:14:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:20:9: warning: unused variable 'cnt' [-Wunused-variable] int cnt=b-a+1; ^~~ main.cpp:27:9: warning: unused variable 'x' [-Wunused-variable] int x=ciur.count(); ^