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
}