DNA （C++代码）(直接上代码）

注意：（每组输出有一个空行）

cout << endl;

cout << endl;

参考代码:

#include<iostream>

using namespace std;

void show(int a,int b)

{

for (int i = 0; i < b; i++)

{

for (int j = 0; j < a - 1; j++)

{

for (int k = 0; k < a; k++)

{

if (k == j || k+ j == (a - 1))

cout << "X";

else

{

cout << " ";

}

}

cout << endl;

}

}

for (int i = 0; i < a; i++)

{

if (i == 0 || i == (a - 1))

{

cout << "X";

}

else

{

cout << " ";

}

}

cout << endl;

cout << endl;

}

int main(){

int n,a,b;

cin >> n;

while (n--)

{

cin >> a >> b;

show(a, b);

}

}