58. Length of Last Word

Easy
​
Given a string s consisting of words and 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 <= 104
  • s consists of only English letters and spaces ' '.
  • There will be at least one word in s.
​

解題

func lengthOfLastWord(s string) int {
count := 0
for i := len(s)-1; i >=0 ; i-- {
if s[i]!=' ' {
count++
}
if s[i]==' '&&count!=0 {
return count
}
}
return count
}