557. Reverse Words in a String III

 static int wing=[]()
 {
     std::ios::sync_with_stdio(false);
     cin.tie(NULL);
     return ;
 }();

 class Solution
 {
 public:
     string reverseWords(string s)
     {
         int len=s.length();
         int pre=-;
         auto p=s.begin();
         for(int i=;i<len;i++)
         {
             if(s[i]==' ')
             {
                 reverse(p+pre+,p+i);
                 pre=i;
             }
         }
         reverse(p+pre+,s.end());
         return s;
     }
 };

以空格为标志，一段一段逆置