0092_P58_Length_of_Last_Word.cpp

 /* 
Day: 92
Problem Number: 58 (https://leetcode.com/problems/length-of-last-word)
Date: 01-04-2024
Description:
Given a string s consisting of words and spaces, return the length of the last word in the string.
A word is a maximal substring consisting of non-space characters only.

Example 1:
Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.

Example 2:
Input: s = "   fly me   to   the moon  "
Output: 4
Explanation: The last word is "moon" with length 4.

Example 3:
Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.

Constraints:
* 1 <= s.length <= 10^4
* s consists of only English letters and spaces ' '.
* There will be at least one word in s.

Code:  */
class Solution {
public:
    int lengthOfLastWord(string s) {
        int i = s.size() - 1;
        while (~i && s[i] == ' ') {
            --i;
        }
        int j = i;
        while (~j && s[j] != ' ') {
            --j;
        }
        return i - j;
    }
};