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Editor to share with you how to achieve LeetCode two sentences in the unusual words, I believe that most people do not understand, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to understand it!

Topic description

Give two sentences An and B. A sentence is a string of words separated by spaces. Each word consists of only lowercase letters. )

If a word appears only once in one sentence, but not in the other, then the word is not common.

Returns a list of all the less commonly used words.

You can return the list in any order.

Example 1:

Input: a = "this apple is sweet", B = "this apple is sour" output: ["sweet", "sour"]: example 2: input: a = "apple apple", B = "banana" output: ["banana"]

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