58. Length of Last Word

顺序扫描字符串

class Solution {
public:
    int lengthOfLastWord(string s) {
        int lenth=s.length();
        vector<int> number;
        int flag=0;
        for(int i=0;i<lenth;i++)
        {
            if(s[i]!=' ')
            {
                flag++;
            }
            else
            {
                if(flag)
                    number.push_back(flag);
                flag=0;
            }
        }
      if(flag)
            number.push_back(flag);
      if(number.size())
          return number[number.size()-1];
        else
            return 0;
    }
};