Length of Last Word

题目：

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

.

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题意：一个字符串，返回最后一个单词的长度，每个单词之间均有一个' '。
理解：这题比较简单，直接从字符串的从后往前遍历遇到第一个' '返回长度就可以了，注意边界情况

class Solution {
public:
int lengthOfLastWord(string s)
{
int length = 0;
for(int i =s.length()-1;i>=0;i--){              //从后往前遍历
if(length ==0)
if(s[i] == ' ')
continue;
else
length++;
else
if(s[i] == ' ')
break;
else
length++;
}
return length;
}
};