Length of Last Word

Length of Last Word

Given a string s consists of some words separated by spaces, return the length of the last word in the string. If the last word does not exist, return 0.

A word is a maximal substring consisting of non-space characters only.

Example 1:

Input: s = "Hello World"
Output: 5

Example 2:

Input: s = " "
Output: 0

Constraints:

• 1 <= s.length <= 104

• s consists of only English letters and spaces ' '.

Solutions

🐍 Python

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        return len(s.rsplit(maxsplit=1)[-1]) if len(s.strip()) else 0

🧠 Cpp

class Solution {
public:
    int lengthOfLastWord(string s)
    {
        int counter = 0;
        auto riter = s.rbegin();
        for(; *riter == ' '; riter++);
        for(; *riter!=' ' && riter!=s.rend(); riter++, counter++);
        return counter;
    }
};