58.Length of Last Word

[niuworld]

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.

Solution:

class Solution {
public:
int lengthOfLastWord(string s) {
    int i = 0;
    int res;
    int size = s.length();
    while( s[size-1] == ' ') {
         s.resize(size - 1 );
      --size;
    }
      i = s.find_last_of( ' ');
     res = ( i == -1)? size: (size - i - 1 );
     return res;
    }
};

Note: there may be several ' ' at the end of the string.