请问执行完以下代码后，输出结果为？
ls = [1, 2, 3, 4, 5, 1]
n = len(ls)
for i in range(n):
for j in range(i + 1, n):
if ls[j] > ls[i]:
tmp = ls[i]
ls[i] = ls[j]
ls[j] = tmp
print(ls)
[1, 2, 3, 4, 5, 1]
[1, 1, 2, 3, 4, 5]
[5, 4, 3, 2, 1, 1]
报错，无输出