题目：
题解：
class Solution {
public:
int lengthOfLastWord(string s) {
int index = s.size() - 1;
while (s[index] == ' ') {
index--;
}
int wordLength = 0;
while (index >= 0 && s[index] != ' ') {
wordLength++;
index--;
}
return wordLength;
}
};
