DNA-题解（Java代码）

解题思路:

注意事项:

参考代码:

Scanner scanner=new Scanner(System.in);

int n=scanner.nextInt();

int a,b;

for (int i = 1; i <=n; i++) {

a=scanner.nextInt();

b=scanner.nextInt();

for (int j = 1; j <=b; j++) {

int num=a-1;

if (b==1||j==b) {

num=a;

}

for (int j1 = 1,x=0; j1 <= b; j1++,x++) {

for (int j2 = 1; j2 <=a; j2++) {

if (j2==j1||j2==a-x) {

   System.out.print("X");

                } else {

                    System.out.print(" ");

                }

}

System.out.println();

}

}

System.out.println();

}