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Abhishek Chaudhary
Abhishek Chaudhary

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Uncommon Words from Two Sentences

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.

SOLUTION:

from collections import Counter

class Solution:
    def uncommonFromSentences(self, s1: str, s2: str) -> List[str]:
        ws = Counter(s1.split()) + Counter(s2.split())
        op = []
        for w in ws:
            if ws[w] == 1:
                op.append(w)
        return op
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