Question: One way to measure the reading difficulty of a book is to count the number of unique words it contains. For example, Green Eggs and

One way to measure the reading difficulty of a book is to count the number of unique words it contains. For example, Green Eggs and Ham, by Dr. Seuss, contains 50 unique words, whereas the book of Isaiah, from the Bible, contains almost 2,000 unique (Hebrew) words. Suppose you have a book, B, containing n total words (including duplicates). Describe an efficient scheme to count the number of unique words in B. You may assume that you have a parser that returns the n words in B as a sequence of character strings in O(n) time. What is the running time of your method?

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