https://leetcode-cn.com/problems/length-of-last-word
Given a string s consisting of some words separated by some number of spaces, return the length of the last word in the string.
A word is a maximal substring consisting of non-space characters only.
Example 1:
Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.
Example 2:
Input: s = " fly me to the moon "
Output: 4
Explanation: The last word is "moon" with length 4.
Example 3:
Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.
Constraints:
1 <= s.length <= 10^4
s consists of only English letters and spaces ' '.
There will be at least one word in s.
class Solution {
public:
int lengthOfLastWord(string s) {
int ans=0;
for(int i=s.size()-1;i>=0;i--){
if (s[i]==' ' && ans!=0) return ans;
if (s[i]!=' ') ans++;
}
return ans;
}
};