LPS

import java.util.*;
class lps{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter pattern");
        String a = sc.nextLine();
        int n = a.length();
        int arr[] = new int[n];
        arr[0] = 0;
        int i = 1;
        int j = 0;

        while(i < n){
            if(a.charAt(i) == a.charAt(j)){
                arr[i] = j + 1;
                j = j + 1;
                i = i + 1;
            }
            else{
                if(j == 0){
                    arr[i] = 0;
                    i = i + 1;
                }
                else{
                    j = arr[j-1];
                }
            }
        }
        System.out.println(Arrays.toString(arr));
    }

}