58_Length_of_Last_Word.cpp

/*
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 <= 104
s consists of only English letters and spaces ' '.
There will be at least one word in s.
*/
class Solution {
public:
    int lengthOfLastWord(string s) {
        int j = s.size()-1;
        int count = 0;
        while(j>=0){
            if(s[j]==' '){
                j--;
            }
            else{
                break;
            }
        }
        while(j>=0){
            if(s[j] !=' '){
                count++;
            j--;
            }
            else{
                break;
            }
        }
        return count;
    }
};