#include "s0078_subsets.hpp"

void subsetsDFS(vector<int> &subset, vector<vector<int>> &result, vector<int> &nums, int startIndex) {
  int size = nums.size();
  // 结束条件
  if (startIndex == size) return;

  for (int i = startIndex; i < size; ++i) {
    subset.push_back(nums[i]);
    result.push_back(subset);
    subsetsDFS(subset, result, nums, i + 1);
    subset.pop_back();
  }
}

vector<vector<int>> S0078::subsets(vector<int>& nums) {
  vector<int> subset{};
  vector<vector<int>> result{};
  subsetsDFS(subset, result, nums, 0);
  result.push_back(vector<int>{});
  return result;
}