Description

Length of Last Word

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.

Example:

Input: "Hello World"
Output: 5

求给出的字符串中最后一个单词的长度。

Solution

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func lengthOfLastWord(s string) int {
    length := 0
    for i := len(s) - 1; i >= 0; i-- {
        if s[i] == ' ' {
            // if there are spaces at last, they'll be skip
            if length > 0 {
                break
            }
        } else {
            // there are only alphabets and space
            // so it's alphabets now
            // we don't need to check if s[i] between 'a' to 'z' or 'A' to 'Z'
            length++
        }
    }

    return length
}