Compilare: user.cpp: In function ‘int main()’: user.cpp:53:21: warning: unused variable ‘top_p’ [-Wunused-variable] pair< int, int > *top_p, *bot_p; ^ user.cpp:53:29: warning: unused variable ‘bot_p’ [-Wunused-variable] pair< int, int > *top_p, *bot_p; ^ user.cpp: In function ‘double get_y(std::pair<int, int>, std::pair<int, int>, int, bool)’: user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^