网易互娱笔试 第一题

import java.util.Scanner;

public class c1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int T = sc.nextInt();
        for(int t=0;t<T;t++){
            int m = sc.nextInt();
            int n = sc.nextInt();
            int value=n/m;
            int remain=n%m;
            int total_len=(value+remain)*m;

            int need=remain/2;
            if(remain%2!=0){
                need=(remain+m)/2;
                value=value-1;
            }
            int much=m-need;
            String[] single=new String[m];
            for(int i=0;i<m;i++){
                single[i]=sc.next();
            }

            for(int i=much;i<total_len-much;i++){
                StringBuffer sb=new StringBuffer();
                String s=single[i%m];
                sb.append(s.substring(much,m));
                for(int p=0;p<value;p++){
                    sb.append(s);
                }
                sb.append(s.substring(0,(total_len-much)%m));
                System.out.println(sb.toString());

            }
            System.out.println();

        }


    }
}