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Leetcode78.cpp
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71 lines (57 loc) · 1.81 KB
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// Leetcode78.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
using namespace::std;
void subsetsRecursion(vector<vector<int>>& res, vector<int>& nums, int index)
{
if (res.empty())
{
res.push_back(vector<int>{});
res.push_back(vector<int>{nums[index]});
}
else
{
int size = res.size();
for (int i = 0; i < size; ++i)
{
vector<int> tmp = res[i];
tmp.push_back(nums[index]);
res.push_back(tmp);
}
}
if (index == nums.size() - 1) return;
subsetsRecursion(res, nums, index + 1);
}
vector<vector<int>> subsets(vector<int>& nums)
{
vector<vector<int>> res;
subsetsRecursion(res, nums, 0);
return res;
}
vector<vector<int>> subsetsBetter(vector<int>& nums) {
vector<vector<int>> subs = { {} };
for (int num : nums) {
int n = subs.size();
for (int i = 0; i < n; i++) {
subs.push_back(subs[i]);
subs.back().push_back(num);
}
}
return subs;
}
int main()
{
vector<int> nums = { 1,2,3 };
subsets(nums);
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file