1 /*
 2 本程序说明：
 3 
 4 翻转一个句子中的单词  比如输入 this is a test  输出  test a is this 输入foobar  输出foobar
 5 
 6 思路：先翻转整个句子，再针对每一个单词翻转之
 7 
 8 */
 9 #include <iostream>
10 #include <string>
11 #include <algorithm>
12 using namespace std;
13 
14 void reverse_word(string& sentence)
15 {
16     reverse(sentence.begin(),sentence.end());
17 
18     string::iterator index_start    =   sentence.begin();
19     string::iterator index_end      =   sentence.begin();
20     for(string::iterator it=sentence.begin();it<sentence.end();++it)
21     {
22         if(' '==*it)
23         {
24             index_end=it;
25             reverse(index_start,index_end);
26             index_start=++it;
27         }
28     }
29     reverse(index_start,sentence.end());//翻转最后一个单词
30 }
31 
32 int main()
33 {
34     string sentence;
35     while(getline(cin,sentence))
36     {
37         reverse_word(sentence);
38         cout<<sentence<<endl;
39     }
40     return 0;
41 }