java版本的： package com.string; import java.util.ArrayList; import java.util.Scanner; public class MyString { public static void main(String[] args) { Scanner in=new Scanner(System.in); int num=in.nextInt(); String[] aStrings=new String[num]; for (int i = 0; i < num; i++) { aStrings[i]=in.next(); } in.close(); System.out.println(isGood(aStrings)); } public static int isGood(String[] arg) { ArrayList<String> list=new ArrayList<String>(); int num=arg.length; //System.out.println(num); if (num<=1) { return -1; } int number=0; for (int i = 0; i < num; i++) { char[] c=arg[i].toCharArray(); int n=c.length; String str1=String.valueOf(c[0]); String str2=String.valueOf(c[n-1]); list.add(str1); list.add(str2); } //// for(int i=0;i<list.size();i++) //// { //// System.out.print(list.get(i)); //// //// } // System.out.println(); for(int i=0;i<(list.size()/2-1);i++) { if (list.get(2*i+1).equals(list.get(2*i+2))) { number+=1; } } if (number==num-1) { return 1; }else return -1; } }