Length of Last Word

class Solution {
public:
int lengthOfLastWord(const char *s) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
int len=strlen(s),p=len-1,cnt=0;
while(p>=0&&s[p]==' '){
--p;
}
while(p>=0&&s[p]!=' '){
--p;
++cnt;
}
return cnt;
}
};