58. Length of Last Word

Explanation

To find the length of the last word in a given string, we can iterate through the string in reverse order. We skip any trailing spaces and then count characters until we encounter a space or reach the beginning of the string.

Start iterating from the end of the string.
Skip any trailing spaces.
Count characters until a space is encountered or the beginning of the string is reached.
Return the count as the length of the last word.

Time Complexity: O(n) where n is the length of the input string.

Space Complexity: O(1)

View Leetcode Problem

class Solution {
    public int lengthOfLastWord(String s) {
        int length = 0;
        int n = s.length();
        int i = n - 1;

        while (i >= 0 && s.charAt(i) == ' ') {
            i--;
        }

        while (i >= 0 && s.charAt(i) != ' ') {
            length++;
            i--;
        }

        return length;
    }
}

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