单词接龙

 1 import  java.util.Scanner;
 2 
 3 public class a {
 4 
 5     public static void main(String[] args) {
 6 
 7             // TODO Auto-generated method stub
 8             boolean flag=true;
 9             Scanner scanner =new Scanner(System.in);
10 
11                 while(scanner.hasNext())
12                 {
13                 int n=scanner.nextInt();
14                 char c;
15                 
16                 String s="";
17                 s=scanner.next();
18                 
19                 char[] ss=s.toCharArray();
20                 c=ss[ss.length-1];
21 
22                 n--;
23                 while(n>0)
24                 {
25                     s=scanner.next();
26                     ss=s.toCharArray();
27                     if(!s.isEmpty()&&flag)
28                     {
29                     if(ss[0]==c)
30                         {c=ss[ss.length-1];}
31                     else {flag=false;}
32                     }
33                     n--;    
34                 }
35                     if(flag)
36                         System.out.println("Yes");
37                     else
38                         {
39                         System.out.println("No");
40                         flag=true;
41                         }            
42                 }
43 
44             }
45 
46         }