[Leetcode]58. Length of Last Word

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

.

class Solution {
public:
int lengthOfLastWord(string s) {
auto first = find_if(s.rbegin(), s.rend(), ::isalpha);
auto last = find_if_not(first, s.rend(), ::isalpha);
return distance(first, last);
}
};