Compilare: user.cpp: In function ‘void read()’: user.cpp:23:9: warning: unused variable ‘a’ [-Wunused-variable] int a, b; ^ user.cpp:23:12: warning: unused variable ‘b’ [-Wunused-variable] int a, b; ^ user.cpp: In function ‘void solve()’: user.cpp:54:15: warning: unused variable ‘aux’ [-Wunused-variable] int a, b, aux; ^