【Leetcode】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(const char *s) {
int total_len = strlen(s);
if (total_len == 0) return 0;
int ret = 0, i = total_len - 1;
while (i >= 0 && s[i] == ' ') --i;
while (i >= 0 && s[i] != ' ') {
++ret;
--i;
}
return ret;
}
};

View Code
按题意数就可以了..