Java-Substring-Comparisons.java

import java.util.Scanner;

public class Solution {

    public static String getSmallestAndLargest(String s, int k) {
        String smallest = "";
        String largest = "";
        
        // Complete the function
        // smallest must be the lexicographically smallest substring of length k
        // largest must be the lexicographically largest substring of length k
        smallest = s.substring(0,k);
        for(int i=0;i<=s.length()-k;i++)
        {
            
            if(s.substring(i,i+k).compareTo(smallest)<0)
            {
                smallest = s.substring(i,i+k);
            }
            if(s.substring(i,i+k).compareTo(largest)>0)
            {
                largest = s.substring(i,i+k);
            }
        }
        
        return smallest + "\n" + largest;
    }

   public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        int k = scan.nextInt();
        scan.close();
      
        System.out.println(getSmallestAndLargest(s, k));
    }
}