0884. Uncommon Words from Two Sentences

https://leetcode.com/problems/uncommon-words-from-two-sentences

Description

A sentence is a string of single-space separated words where each word consists only of lowercase letters.

A word is uncommon if it appears exactly once in one of the sentences, and does not appear in the other sentence.

Given two sentences s1 and s2, return a list of all the uncommon words. You may return the answer in any order.

Example 1:

**Input:** s1 = "this apple is sweet", s2 = "this apple is sour"
**Output:** ["sweet","sour"]

Example 2:

**Input:** s1 = "apple apple", s2 = "banana"
**Output:** ["banana"]

Constraints:

• 1 <= s1.length, s2.length <= 200

• s1 and s2 consist of lowercase English letters and spaces.

• s1 and s2 do not have leading or trailing spaces.

• All the words in s1 and s2 are separated by a single space.

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