Compilare: user.cpp: In function ‘int main()’: user.cpp:98:9: warning: unused variable ‘st’ [-Wunused-variable] int st = 1; ^~ user.cpp:99:9: warning: unused variable ‘cur’ [-Wunused-variable] int cur = 0; ^~~ user.cpp: In function ‘bool cmp(event, event)’: user.cpp:66:1: warning: control reaches end of non-void function [-Wreturn-type] } ^