LeetCode 2490: Circular Sentence Solution

Master LeetCode problem 2490 (Circular Sentence), 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.

2490. Circular Sentence

Easy

String

Problem Explanation

Explanation:

To determine if a sentence is circular, we need to check if the last character of each word is equal to the first character of the next word, and if the last character of the last word is equal to the first character of the first word.

Split the input sentence into individual words.
Iterate through the words and check if the last character of each word matches the first character of the next word.
Finally, check if the last character of the last word matches the first character of the first word.
If all conditions are met, the sentence is circular.

Time Complexity: O(n), where n is the number of characters in the input sentence. Space Complexity: O(n), where n is the number of characters in the input sentence.

Solution Code

class Solution {
    public boolean isCircular(String sentence) {
        String[] words = sentence.split(" ");
        for (int i = 0; i < words.length - 1; i++) {
            if (words[i].charAt(words[i].length() - 1) != words[i + 1].charAt(0)) {
                return false;
            }
        }
        return words[words.length - 1].charAt(words[words.length - 1].length() - 1) == words[0].charAt(0);
    }
}

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