78. 子集
78. 子集 class Solution: def subsets(self, nums: List[int]) -> List[List[int]]: res = [] path = [] n = len(nums) def backtracking(nums, startIndex): res.append(path[:]) for i in range(startIndex,len(nums)): path.append(nums[i]) backtracking(nums,i+1) path.pop()#回溯 backtracking(nums,0) return res