题解 | #回文字符串#

#include <bits/stdc++.h>
using namespace std ; 
int main()
{
    string s ; 
    while(cin >> s)
    {
        int len = s.length() ; 
        int mid = len / 2 ;
        int start = 0 ;
        int end = 0 ;
        string s1,s2 ;
        if(len % 2 == 1)
        {
            s1 = s.substr(0 , (len -1) / 2) ;
            s2 = s.substr(mid + 1 , (len - 1) / 2) ;
            
        }
        else 
        {
            s1 = s.substr(0 , len / 2) ;
            s2 = s.substr(mid , len / 2) ;
        }
        reverse(s2.begin(),s2.end());
        // cout << s1 << "  " << s2 << endl ;
        if(s1 == s2)
            cout << "Yes!" << endl ;
        else cout << "No!" << endl ;
        
    }
    return 0 ;
}