【字符串】151. 翻转字符串里的单词

 1 class Solution {
 2 public:
 3     string reverseWords(string s) 
 4     {
 5         if (s.empty())
 6         {
 7             return s;
 8         }
 9         
10         int len = 0;
11         string ans = "";
12 
13         for (int m = s.size() - 1; m >= 0; m--)
14         {
15             if (s[m] == ‘ ‘ && len != 0)
16             {
17                 ans += s.substr(m+1, len) + " ";
18                 len = 0;
19                 continue;
20             }
21             if (s[m] != ‘ ‘)
22             {
23                 len++;
24             }
25         }
26 
27         if (len != 0)
28         {
29             ans += s.substr(0, len) + " ";
30         }
31 
32         if (ans.size() > 0)
33         {
34             ans.erase(ans.size() - 1, 1);
35         }
36 
37         return  ans;
38 
39     }
40 };