LeetCode-in-Cpp
78. Subsets
Medium
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
numsare unique.
Solution
#include <vector>
class Solution {
public:
std::vector<std::vector<int>> subsets(const std::vector<int>& nums) {
std::vector<std::vector<int>> res;
std::vector<int> temp;
solve(nums, temp, res, 0);
return res;
}
private:
void solve(const std::vector<int>& nums, std::vector<int>& temp, std::vector<std::vector<int>>& res, int start) {
res.push_back(temp);
for (int i = start; i < nums.size(); i++) {
temp.push_back(nums[i]);
solve(nums, temp, res, i + 1);
temp.pop_back();
}
}
};