Compilare: user.cpp: In function ‘int main()’: user.cpp:70: warning: unused variable ‘aux’ user.cpp:72: warning: unused variable ‘x’ user.cpp:11: warning: ‘key.pt::x’ may be used uninitialized in this function user.cpp:72: note: ‘key.pt::x’ was declared here user.cpp:39: warning: ‘key.pt::y’ may be used uninitialized in this function user.cpp:72: note: ‘key.pt::y’ was declared here user.cpp:71: warning: ‘pos’ may be used uninitialized in this function