LeetCode 2129: Capitalize the Title Solution

Master LeetCode problem 2129 (Capitalize the Title), 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.

2129. Capitalize the Title

Easy

String

Problem Explanation

Explanation

We can solve this problem by iterating over each word in the input string. For each word, we check its length and then capitalize it accordingly. If the length is 1 or 2, we convert the word to lowercase. If the length is 3 or more, we capitalize the first letter and convert the rest to lowercase. We repeat this process for all words in the input string to obtain the final capitalized title.

Time complexity: O(n), where n is the length of the input string.
Space complexity: O(n), to store the final capitalized title.

Solution Code

class Solution {
    public String capitalizeTitle(String title) {
        String[] words = title.split(" ");
        StringBuilder sb = new StringBuilder();
        
        for (int i = 0; i < words.length; i++) {
            if (words[i].length() <= 2) {
                sb.append(words[i].toLowerCase());
            } else {
                sb.append(Character.toUpperCase(words[i].charAt(0)));
                sb.append(words[i].substring(1).toLowerCase());
            }
            
            if (i < words.length - 1) {
                sb.append(" ");
            }
        }
        
        return sb.toString();
    }
}

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