Compilare: user.cpp: In function ‘int cb0(int)’: user.cpp:19:15: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] return v[i]==key ? i:-1; ^ user.cpp: In function ‘int cb1(int)’: user.cpp:29:12: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] return i; ^ user.cpp: In function ‘int cb2(int)’: user.cpp:38:12: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] return i; ^