leetcode: Length of Last Word

Problem Description:

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example,
Given s = "Hello World",
return 5.

Solution

A very simple problem, just start from the end of the string, escape those space characters first then start counting.

Written on April 20, 2013