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Agree. not sure what this "medium" difficulty quesion is aiming at.
Shorter description: Given an array of strings FOO and a an array of strings BAR find the count of string in BAR that occurs in FOO.
C#. Linq is your friend.
var results = new int[queries.Length];
var index = 0;
foreach (string s in queries)
results[index++] = strings.Where(i => i == s).Count();