Compilare: user.cpp: In function ‘void read()’: user.cpp:42:11: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>>S+1; ^ user.cpp:8:11: warning: unused variable ‘first’ [-Wunused-variable] #define x first ^ user.cpp:41:9: note: in expansion of macro ‘x’ int x, y; ^ user.cpp:9:11: warning: unused variable ‘second’ [-Wunused-variable] #define y second ^ user.cpp:41:12: note: in expansion of macro ‘y’ int x, y; ^