对称串 

Time Limit:1000MS  Memory Limit:32768K

Description:

有一些字串，有些对称，有些不对称，请将对称的串按长度排列。

 

Sample Input:

123321123454321123321sdfsdfd121212\\dd\\

Sample Output:

123321\\dd\\123454321 code ：

1 /* 2  3 */ 4 #include 
       
         5 #include 
        
          6 #include 
         
           7 #include 
          
            8 using namespace std; 9 10 struct cmp11 {12     public:13         bool operator () (const string &s1, const string &s2) {14             return s1.length() < s2.length();15         }16 };17 bool is_symmetrical (string str);18 19 int main()20 {21     vector
           
             ve;22     for (string str; cin >> str;) {23         if (is_symmetrical(str))24             ve.push_back(str);25     }26     if (ve.size()) {27         sort(ve.begin(), ve.end(), cmp());28         int i = 0, len = ve.size();29         for (; i < len; i++)30             cout << ve[i] << endl;31     }32 }33 34 bool is_symmetrical (string str) {35     bool symmetry = true;36     int len  = str.length(), i = 0;37     for (; i < len / 2; i++) {38         if (str[i] != str[len - i - 1])39             symmetry = false;40     }41     return symmetry;42 }