LeetCode--557. 反转字符串中的单词 III（C++描述）

// Source : https://leetcode-cn.com/problems/reverse-words-in-a-string-iii/
// Date : 2021-11-24

class Solution {
public: 
    string reverseWords(string s) {
        int length = s.length(), i = 0;
        while (i < length) 
        {
            int start = i;
            while (i < length && s[i] != ' ') 
                i++;
            //处理每个单词
            int left = start, right = i - 1;
            while (left < right) 
            {
                swap(s[left], s[right]);
                left++;
                right--;
            }
            //此时i停留在空格，因此需要将i后移
            // while (i < length && s[i] == ' ') 
                i++;
        }
        return s;
    }
};