Compilare: user.cpp: In function ‘int main()’: user.cpp:11:12: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int n, k, r; ^ user.cpp:11:15: warning: variable ‘r’ set but not used [-Wunused-but-set-variable] int n, k, r; ^ user.cpp:17:17: warning: unused variable ‘a’ [-Wunused-variable] int sol= 1, a= (n-2)/2, b= (n-2)/2+(n-2)%2; ^