add solution to problem 22. I was tempted to use java.util.Arrays.binarySearch on Array[String], but found it won't work. Should dig it more when having time.
add solution to problem 22. I was tempted to use java.util.Arrays.binarySearch
on Array[String], but found it won't work. Should dig it more when having time.

advancedxy/hackerrank,advancedxy/hackerrank,advancedxy/hackerrank