题解 | 圣诞树

n = int(input())
max_width = 6*n-1
for i in range(3*n):
    if i%3 == 0:
        line = '*'
    elif i%3 == 1:
        line = '* *'
    else:
        line = '* * *'
    level = i//3 
    for _ in range(level):
        if i%3 ==0:
            line +='     *'
        elif i%3 == 1:
            line +='   * *'
        else:
            line+=' * * *'
    print(line.center(max_width))


for i in range(n):
    print('*'.center(max_width))