README.md

884. Uncommon Words from Two Sentences

We are given two sentences A and B. (A sentence is a string of space separated words. 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.

Return a list of all uncommon words.

You may 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"]

Note:

1. 0 <= A.length <= 200
2. 0 <= B.length <= 200
3. A and B both contain only spaces and lowercase letters.

Solutions (Python)

1. Count

class Solution:
    def uncommonFromSentences(self, A: str, B: str) -> List[str]:
        word_count = {}
        ret = []

        for word in (A + ' ' + B).split(' '):
            if word_count.get(word):
                word_count[word] += 1
            else:
                word_count[word] = 1

        for word, count in word_count.items():
            if count == 1:
                ret.append(word)

        return ret