Compilare: user.cpp: In function ‘int solve1(int)’: user.cpp:56:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int solve0(int)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int solve2(int)’: user.cpp:80:1: warning: control reaches end of non-void function [-Wreturn-type] } ^