58. Length of Last Word

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

C++

class Solution
{
public:
    int lengthOfLastWord(string s)
    {
        int ans = -1;
        int pointer = s.length() - 1;

        while (s.length() > pointer)
        {
            char temp=s[pointer];
            if (s[pointer] == ' ')
            {
                if (ans >= 0)
                    return ans + 1;
            }
            else
                ans++;
                
            pointer--;
        }
        return ans + 1;
    }
};