leetcode 557. Reverse Words in a String III

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

难度评估：简单题

C++代码：

class Solution {
public:
    //代码只考虑字符串每个word之间只有一个空格，且字符串首尾没有空格
    string reverseWords(string s) {
        for (int i = 0; i < s.length();) {
            if (s[i] != ' ') {
                int j = i;
                while ((j < s.length()) && (s[j] != ' ')) {
                    ++j;
                }
                reverse(s.begin() + i, s.begin() + j);
                i = j + 1;
            } else {
                ++i;
            }
        }
        return s;
    }
};

python3代码：

class Solution:
    def reverseWords(self, s: str) -> str:
        return ' '.join(s.split()[::-1])[::-1]