题解 | 圣诞树

from re import I
n = int(input())
for i in range(1,3*n+1):
    k = 3 * n - i
    for j in range(k):
        print(' ',end='')
    if i % 3 == 0:
        for t in range(i):
            print('* ',end='')
    elif i % 3 == 1:
        for t in range((i+2)//3):
            print('*     ',end='')
    else:
        for t in range((i+1)//3):
            print('* *   ',end='')
    print()
for r in range(n):
    k = 3 * n - 1
    for m in range(k):
        print(' ',end='')
    print('*')