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c++ generate all subsets
“c++ generate all subsets” Code Answer’s
c++ generate all subsets
cpp by
Evang
on Jul 16 2020
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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 }
print all unique subsets
cpp by
Proud Puffin
on Sep 26 2020
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0
#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 // remove adjacent duplicate elements 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[0]); // 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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