Easy 13 Length of Last Word（58）

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
统计最后一个单词的长度，简单的统计，遇见空格就重新统计。有一点要注意的是，当字符串末尾有空格时，需要保留上一次的长度统计。

class Solution {
public:
    int lengthOfLastWord(string s) {
        int len=0;
        bool flag=true;
        for(int i=0;i<s.size();i++){
            if(!isspace(s[i])){ 
              if(!flag) len=0;//通过标记位的形式，如果在遇见非空格字符，才清除上次记录。
              flag=true;
              len++;
            }else{
             flag=false;
            }
        }
        return len;
    }
};