#16 Java Substring Comparisons | Hackerrank Java Solutions

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import java.util.Scanner;

public class Main {

public static String getSmallestAndLargest(String s, int k) {
int i = 0;
String ss = "";
String[] arr = new String[s.length() - k + 1];

for (int j = k; j <= s.length(); j++) {
ss = s.substring(i, j);
arr[i] = ss;
i++;
}

for (int m = 0; m < arr.length - 1; m++) {
for (int n = 0; n < arr.length - 1 - m; n++) {
int result = arr[n].compareTo(arr[n + 1]);

if (result > 0) {
String temp = arr[n];
arr[n] = arr[n + 1];
arr[n + 1] = temp;
}
}
}

return arr[0] + "\n" + arr[arr.length - 1];
}

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));
}
}