Compilare: user.cpp:15:24: warning: integer overflow in expression [-Woverflow] const int oo = (1<<31)-1; ^ user.cpp: In function ‘int main()’: user.cpp:95:13: warning: unused variable ‘x’ [-Wunused-variable] int x, y; ^ user.cpp:95:16: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^ user.cpp:105:9: warning: unused variable ‘i’ [-Wunused-variable] int i = 1; ^