U. Is B a subsequence of A ? (#)

import java.util.*;

public class now {
    public static void Subsequence(int arr1[], int arr2[]) {
        int i=0,j=0;
        while(true){
            if(i==arr1.length || j==arr2.length ) break;
            if(arr1[i]==arr2[j]) j++;
            i++;
        }
        if(j==arr2.length) System.out.println("YES");
        else System.out.println("NO");
    }

    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        int N;
        N = sc.nextInt();   

        int M;
        M = sc.nextInt();  

        int arr1[] = new int [N];
        int arr2[] = new int[M];

        for(int i=0;i<N;i++){
            arr1[i]=sc.nextInt();
        }
        for(int j=0;j<M;j++){
            arr2[j]=sc.nextInt();
        } 
        
        Subsequence(arr1,arr2);

        sc.close();
    }
}


LOGIC: We take two pointers i and j.
One iterate normally over the main array and the other j will move over the second array only if a match is found.
Hence if j is equal to length of second array in the end, we have found our subsequence.

Link - https://codeforces.com/group/MWSDmqGsZm/contest/219774/problem/U