Length of Last Word 最后一个单词的长度

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) {
if(s == ""){
return 0;
}

int len = s.length()-1;
while(s[len] == ' ' && len >= 0){
len--;
}

int sum = 0;
for(int i=len;i>=0;i--){
if(s[i] != ' '){
sum++;
}else{
break;
}
}
return sum;
}
};