78. Subsets

https://leetcode.com/problems/subsets/

JavaScript

/**
 * @param {number[]} nums
 * @return {number[][]}
 */
var subsets = function(nums) {
  var result = [
    []
  ]

  for (let i = 0; i < nums.length; i++) {
    let size = result.length
    for (let j = 0; j < size; j++) {
      result.push(result[j].concat([nums[i]]))
    }
  }

  return result
}

Python

class Solution(object):

    def subsets(self, nums):
        """
        :type nums: List[int]
        :rtype: List[List[int]]
        """
        result = [[]]
        for i in range(len(nums)):
            size = len(result)
            for j in range(size):
                result.append(result[j] + [nums[i]])
        return result