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.

题解：

class Solution {
public:
  string reverseWords(string s) {
    string idx;
    string ans;
    for (int i = 0; i < s.length(); i++) {
      if (s[i] != ' ') {
        idx += s[i];
      }
      else {
        reverse(idx.begin(), idx.end());
        ans += idx;
        ans += ' ';
        idx.clear();
      }
    }
    reverse(idx.begin(), idx.end());
    ans += idx;
    return ans;
  }
};