n = int(input())

ls=[0 for i in range(1,n+2)]

li=[i for i in range(1,n+1)]

def dfs(depth):

if depth == n:
    print(li)
for i in range(1,n+1):
    if ls[i] != 1:
        ls[i] = 1
        li[depth] = i
        dfs(depth+1)
        ls[i] = 0

dfs(0)

运行结果符合题目要求为什么错了