1684. Count the number of consistent strings

//1684. Count the number of consistent strings

class Solution {
    public int countConsistentStrings(String allowed, String[] words) {
        int[] arr = new int[26];

        for(char i : allowed.toCharArray()) {
            arr[i - 'a'] = 1;
        }

        int count = 0;

        for(String k : words) {
            count += findConsistentString(arr, k);
        }

        return count;
    }

    public static int findConsistentString(int[] arr, String k) {
        int flag = 1;

        for(int i = 0; i < k.length(); i++) {
            if(arr[k.charAt(i) - 'a'] == 0) {
                flag = 0;
                break;
            }
        }
        
        return flag;
    }
}