这道题不会，希望有大神指导一下

Question

public class liuniu {

  import java.util.Scanner;
  public static void main(String[] args) {
 int n=sc.nextInt();
   int cost=sc.nextInt(); 
   int a,b,c;
     
     
  cost=a*3+b*2+c*1;
   n=a+b+c;
   System.out.println(a);
   System.out.println(b);
  System.out.println(c);
   }
     }

 

Answer 1