Main.java:4: error: class Combinations is public, should be declared in a file named Combinations.java
public class Combinations {
       ^
Main.java:30: error: cannot find symbol
        int n = scanner.nextInt();
                ^
  symbol:   variable scanner
  location: class Combinations
Main.java:31: error: cannot find symbol
        int k =scanner.nextInt();
               ^
  symbol:   variable scanner
  location: class Combinations
3 errors