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powerset.cc
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powerset.cc
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#include <iostream>
#include <set>
#include <vector>
#include <iterator>
typedef std::vector<int> Data;
typedef std::vector<int> Set;
void printSet(Set const & set)
{
std::cout << "{";
char const * delim = "";
for (Set::value_type i : set) {
std::cout << delim << i;
delim = ", ";
}
std::cout << "}" << std::endl;
}
void powerset(Data const & data, size_t start, Set & out)
{
printSet(out);
for (size_t i = start; i < data.size(); ++i) {
out.push_back(data[i]);
powerset(data, i+1, out);
out.pop_back();
}
}
void powerset(Data const & data)
{
Set out;
powerset(data, 0, out);
}
int main()
{
int val;
std::vector<int> data;
while (std::cin >> val) {
data.push_back(val);
}
powerset(data);
return 0;
}