Question

Java

An int variable n contains a positive integer and a String variable s contains a String. Write the Java code needed to print "YES" if the first n characters of s appear more than once in s, and print "NO" otherwise.

Answer 1

import java.util.Scanner;

public class FirstNContains {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a string: ");
        String line = in.nextLine();
        System.out.print("Enter a positive integer: ");
        int n = in.nextInt();
        String s = line.substring(0, n);

        boolean found = false;
        for (int i = 1; i < line.length(); i++) {
            if (line.substring(i).startsWith(s)) {
                found = true;
            }
        }
        if (found) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }

        in.close();
    }
}