Compilare: user.cpp:8: warning: integer overflow in expression user.cpp: In function ‘int cmp(punct, punct)’: user.cpp:29: warning: integer overflow in expression user.cpp:27: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:35: warning: integer overflow in expression user.cpp:33: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘void pre()’: user.cpp:75: warning: unused variable ‘PU’