78. Subsets

원문: https://doljae.tistory.com/114

[Subsets - LeetCode

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leetcode.com](https://leetcode.com/problems/subsets/)

1. 내장 함수 사용

from itertools import combinations

class Solution:
    def subsets(self, nums: List[int]) -> List[List[int]]:
        answer=[]
        for length in range(len(nums)+1):
            for item in combinations(nums, length):
                answer.append(list(item))
        return answer

2. 직접 구현

class Solution:

    def subsets(self, nums: List[int]) -> List[List[int]]:
        answer = []

        def comb(cnt, cur_index, result):
            if cur_index == len(nums):
                answer.append(result)
                return

            comb(cnt + 1, cur_index + 1, result + [nums[cur_index]])
            comb(cnt, cur_index + 1, result)

        comb(0, 0, [])
        return answer

오랜만에 직접 구현해봤는데 이쁘게 해보려고 하다가 삽질을 너무 많이 했다.