permutations
permutations.py 源码
from typing import List
# 全排列
class Solution:
def permute(self, nums: List[int]) -> List[List[int]]:
res = []
self.helper(nums, [], res)
return res
def helper(self, nums, data, res):
if len(data) == len(nums):
res.append(data[:])
return
for n in nums:
if n not in data:
data.append(n)
self.helper(nums, data, res)
data.pop()
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