tsanmmmm2000's Tech Blog

Question

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.

Thinking

如果使用C# Library提供的方法可以很快解出這題

public class Solution {
    public int LengthOfLastWord(string s) {
        var sArray = s.Trim().Split(' ');
        var lastWord =  sArray[sArray.Length - 1];
        return lastWord.Length;
    }
}

但以下我們想試試比較原始的方式

My C# Solution

public class Solution {
    public int LengthOfLastWord(string s) {
        var lastWordLength = 0;
        for (var i = s.Length - 1; i >= 0; i--)
        {
            if (s[i].ToString() == " ") 
            {
                if (lastWordLength == 0)
                {
                    continue;
                }
                else
                {
                    break;
                }
            }
            lastWordLength++;
        }
        return lastWordLength;
    }
}