HackerRank in a String!

FRom hackerrank

We say that a string contains the word hackerrank if a subsequence of its characters spell the word hackerrank. For example, if string  it does contain hackerrank, but  does not. In the second case, the second r is missing. If we reorder the first string as , it no longer contains the subsequence due to ordering.

More formally, let  be the respective indices of h, a, c, k, e, r, r, a, n, k in string . If  is true, then  contains hackerrank.

For each query, print YES on a new line if the string contains hackerrank, otherwise, print NO.

Solution in C# -

class Solution {

    static string hackerrankInString(string s) {

         string s1 = "hackerrank";

        if (s.Length < s1.Length) {

            return "NO";

        }

        int j = 0;

        for (int i = 0; i < s.Length; i++) {

            if (j < s1.Length && s[i] == s1[j]) {

                    j++;

            }

        }

        if(j==s1.Length)

        return "YES";

        else

        return "NO";

    }

    static void Main(string[] args) {

        TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        int q = Convert.ToInt32(Console.ReadLine());

        for (int qItr = 0; qItr < q; qItr++) {

            string s = Console.ReadLine();

            string result = hackerrankInString(s);

            textWriter.WriteLine(result);

        }

        textWriter.Flush();

        textWriter.Close();

    }

}