题目:

题解:

class Solution {
    public int lengthOfLastWord(String s) {
        int index = s.length() - 1;
        while (s.charAt(index) == ' ') {
            index--;
        }
        int wordLength = 0;
        while (index >= 0 && s.charAt(index) != ' ') {
            wordLength++;
            index--;
        }
        return wordLength;
    }
}

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