问题 1115: DNA

import java.util.Scanner;

public class Prog1115 {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();

int arr[][] = new int[n][2];

for (int i = 0; i < n; i++) {

arr[i][0] = scan.nextInt();

arr[i][1] = scan.nextInt();

}

for (int i = 0; i < n; i++) {

for (int w = 0; w < arr[i][1]; w++) {

for (int j = 0; j < arr[i][0] - 1; j++) {

for (int p = 0; p < arr[i][0]; p++) {

if (j == p || j + p == arr[i][0] - 1)

System.out.print("X");

else

System.out.print(" ");

}

System.out.println();

}

}

System.out.print("X");

for (int k = 1; k < arr[i][0] - 1; k++) {

System.out.print(" ");

}

System.out.print("X");

System.out.println();

System.out.println();

}

}

}