Check out example codes for "c++ generate all subsets". It will help you in understanding the concepts better.

Code Example 1

``````#include <vector>
#include <iostream>
#include <cmath>
using namespace std;

int main() {
// this is the length of the array of values
// change variable "len" accordingly
int len = 5;
// this is the array of values
int values[] = {3, 4, 2, 8, 5};

// all subsets will be in vector "subsets"
vector<vector<int>> subsets;
for (int i = 0; i < pow(2, len); i++) {
int t = i;
vector<int> v;
for (int j = 0; j < len; j++) {
if (t & 1)
v.push_back(values[j]);
t >>= 1;
}
subsets.push_back(v);
}

// print all of the subsets (optional)
cout << "subsets:\n";
for (const vector<int>& subset: subsets) {
for (const int& value: subset)
cout << value << " ";
cout << "\n";
}
// note: an empty line will be printed at the top,
// indicating an empty subset
}``````

Code Example 2

``````#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

// Function to print the elements of a vector
void printVector(vector<int> const &out)
{
for (int i: out)
cout << i << " ";
cout << '\n';
}

// Recursive function to print all distinct subsets of S
// S    --> input set
// out  --> vector to store subset
// i    --> index of next element in set S to be processed
void findPowerSet(int S[], vector<int> &out, int i)
{
// if all elements are processed, print the current subset
if (i < 0)
{
printVector(out);
return;
}

// include current element in the current subset and recur
out.push_back(S[i]);
findPowerSet(S, out, i - 1);

// exclude current element in the current subset
out.pop_back(); // backtrack

while (S[i] == S[i-1])
i--;

// exclude current element in the current subset and recur
findPowerSet(S, out, i - 1);
}

// Program to generate all distinct subsets of given set
int main()
{
int S[] = { 1, 3, 1 };
int n = sizeof(S) / sizeof(S);

// sort the set
sort(S, S + n);

// create an empty vector to store elements of a subset
vector<int> out;
findPowerSet(S, out, n-1);

return 0;
}``````

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