题解 | 箭形图案

while True:
    try:
        n = int(input()) + 1
        for i in range(1,n+1):
            k = n - i
            for j in range(k):
                print('  ',end='')
            for l in range(i - 1):
                print('*',end='')
            print('*')
        for k1 in range(1,n):
            z = n - k1
            for x in range(k1):
                print('  ',end='')
            for y in range(z - 1):
                print('*',end='')
            print('*')
    except EOFError:
        break