subsets.py 源码
from typing import List
# 子集
class Solution:
def subsets(self, nums: List[int]) -> List[List[int]]:
res = []
self.helper(nums, 0, [], res)
return res
def helper(self, nums, k, data, res):
res.append(data[:])
for i in range(k, len(nums)):
data.append(nums[i])
self.helper(nums, i + 1, data, res)
data.pop()