78. Subsets

Given an integer array nums of unique elements, return all possible subsets (the power set).

The solution set must not contain duplicate subsets. Return the solution in any order.

 

Example 1:

Input: nums = [1,2,3]
Output: [[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3]]

Example 2:

Input: nums = [0]
Output: [[],[0]]

 

Constraints:

  • 1 <= nums.length <= 10
  • -10 <= nums[i] <= 10
  • All the numbers of nums are unique.

Rust Solution

struct Solution;

impl Solution {
    fn subsets(nums: Vec<i32>) -> Vec<Vec<i32>> {
        let mut res: Vec<Vec<i32>> = vec![];
        let mut v: Vec<i32> = vec![];
        let n = nums.len();
        Self::dfs(0, &mut res, &nums, &mut v, n);
        res
    }

    fn dfs(i: usize, all: &mut Vec<Vec<i32>>, nums: &[i32], cur: &mut Vec<i32>, n: usize) {
        if i == n {
            all.push(cur.to_vec());
        } else {
            Self::dfs(i + 1, all, nums, cur, n);
            cur.push(nums[i]);
            Self::dfs(i + 1, all, nums, cur, n);
            cur.pop();
        }
    }
}

#[test]
fn test() {
    let nums = vec![1, 2, 3];
    let res = vec![
        vec![],
        vec![3],
        vec![2],
        vec![2, 3],
        vec![1],
        vec![1, 3],
        vec![1, 2],
        vec![1, 2, 3],
    ];
    assert_eq!(Solution::subsets(nums), res);
}

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