LeetCode 884: Uncommon Words from Two Sentences Solution

Master LeetCode problem 884 (Uncommon Words from Two Sentences), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

884. Uncommon Words from Two Sentences

Easy

Hash Table String Counting

Problem Explanation

Explanation

Split the input sentences s1 and s2 into words.
Count the frequency of each word in both sentences.
Identify the uncommon words based on the conditions given in the problem.
Return the list of uncommon words.

Time Complexity: O(n) Space Complexity: O(n)

Solution Code

import java.util.*;

class Solution {
    public String[] uncommonFromSentences(String s1, String s2) {
        Map<String, Integer> count = new HashMap<>();
        
        for (String word : (s1 + " " + s2).split(" ")) {
            count.put(word, count.getOrDefault(word, 0) + 1);
        }
        
        List<String> uncommon = new ArrayList<>();
        for (String word : count.keySet()) {
            if (count.get(word) == 1) {
                uncommon.add(word);
            }
        }
        
        return uncommon.toArray(new String[0]);
    }
}

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