题解 | 空心正方形图案

while True:
    try:
        n = int(input())
        for i in range(1,n+1):
            if i == 1 or i == n:
                for j in range(1,n):
                    print('* ',end='')
                print('*')
            else:
                print('* ',end='')
                for j in range(2,n):
                    print('  ',end='')
                print('*')
    except EOFError:
        break