Compilare: user.cpp: In function ‘long int binary_search(int, long int, long int)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘long int case2_helper(int, long int, long int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘long int case3_helper(int, long int, long int)’: user.cpp:57:1: warning: control reaches end of non-void function [-Wreturn-type] } ^