130242014072 邱慧坚 第3次实验

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;

public static String[] input() {
        Scanner scanner = new Scanner(System.in);
        int len = scanner.nextInt();
        String[] result = new String[len];
        for (int i = 0; i < len; i++) {
            result[i] = scanner.next();
        }
        return result;
    }

    public static List<String[]> shifter(String[] a) {
        List<String[]> resultList = new ArrayList<String[]>();
        String temp = null;
        for (int i = 0; i < a.length; i++) {
            resultList.add(a.clone());
            temp = a[0];
            for (int k = 0; k < a.length - 1; k++) {
                a[k] = a[k + 1];
                if (k == a.length - 2) {
                    a[a.length - 1] = temp;
                }
            }

        }
        return resultList;
    }
        public static List<String[]> join(List<String[]> a, List<String[]> b) {
        List<String[]> resultList = new ArrayList<String[]>();

        for (int i = 0; i < a.size(); i++) {
            resultList.add(a.get(i));
        }
        for (int i = 0; i < b.size(); i++) {
            resultList.add(b.get(i));
        }

        return resultList;
    }
    //排序
    public static List<String[]> removeRepetition(List<String[]> a) {

        for (int i = 0; i < a.size(); i++) {
            for (int j = i; j < a.size() - 1; j++) {
                if (a.get(i)[0].charAt(0) == a.get(j + 1)[0].charAt(0)) {
                    a.remove(j + 1);
                }
            }
        }

        return a;
    }    

    public static List<String[]> sort(List<String[]> a) {
        String[] temp = null;
        for (int i = 0; i < a.size(); i++) {
            for (int j = i; j < a.size() - 1; j++) {
                if (a.get(i)[0].charAt(0) > a.get(j + 1)[0].charAt(0)) {
                    temp = a.get(i);
                    a.set(i, a.get(j + 1));
                    a.set(j + 1, temp);
                }
            }
        }

        return a;
    }
    //输出
    public static void ouput(String[] a) {
        for (int i = 0; i < a.length; i++) {
            System.out.print(a[i] + " ");
        }
        System.out.println();
    }