Subsets – LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

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.

C++ Subsets LeetCode Solution

Recursive (Backtracking)
class Solution {
public:
    vector<vector<int>> subsets(vector<int>& nums) {
        vector<vector<int>> subs;
        vector<int> sub;
        subsets(nums, 0, sub, subs);
        return subs;
    }
private:
    void subsets(vector<int>& nums, int i, vector<int>& sub, vector<vector<int>>& subs) {
        subs.push_back(sub);
        for (int j = i; j < nums.size(); j++) {
            sub.push_back(nums[j]);
            subsets(nums, j + 1, sub, subs);
            sub.pop_back();
        }
    }
};

Java Subsets LeetCode Solution

public List<List<Integer>> subsets(int[] nums) {
    Arrays.sort(nums); // make sure subsets are ordered
    List<List<Integer>> result = new ArrayList<>();
    result.add(new ArrayList<>()); // start with empty set
    for (int i = 0; i < nums.length; ++i) {
        for (int j = 0, size = result.size(); j < size; ++j) { // remember
            List<Integer> subset = new ArrayList<>(result.get(j)); // copy a new one
            subset.add(nums[i]); // expand
            result.add(subset); // collect
        }
    }
    return result;
}
 

Python 3 Subsets LeetCode Solution

class Solution(object):
    def subsets(self, nums):
        nums.sort()
        result = [[]]
        for num in nums:
            result += [i + [num] for i in result]
        return result

Array-1180
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Bit Manipulation-140
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Simulation-103
Prefix Sum-96
Backtracking-92
Counting-86
Sliding Window-73
Linked List-69
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Queue-33
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Topological Sort-31
Geometry-30
Segment Tree-27
Game Theory-24
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Binary Indexed Tree-21
Interactive-18
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Shortest Path-16
Number Theory-16
Combinatorics-15
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Monotonic Queue-9
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Brainteaser-8
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