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// @Title: 子集 (Subsets)
// @Author: 15816537946@163.com
// @Date: 2020-12-05 14:40:44
// @Runtime: 0 ms
// @Memory: 2.2 MB
func subsets(nums []int) (ans [][]int) {
	set := []int{}
	var dfs func(int)
	dfs = func(cur int) {
		if cur == len(nums) {
			ans = append(ans, append([]int(nil), set...))
			return
		}
		set = append(set, nums[cur])
		dfs(cur + 1)
		set = set[:len(set)-1]
		dfs(cur + 1)
	}
	dfs(0)
	return
}