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Cod sursa(job #932196)
#include <iostream>
#include <fstream>
using namespace std;
int N;
int Sol[20];
ifstream fin("submultimi.in");
ofstream fout("submultimi.out");
void Write()
{
int s=0;
for(int i=1;i<=N;i++)
{
s+=Sol[i];
if(Sol[i]==1)
fout<<i<<' ';
}
if(s!=0)
fout<<'\n';
}
void back(int k)
{
if(k>N)
Write();
else
{
for(int i=0;i<2;i++)
{
Sol[k]=i;
back(k+1);
}
}
}
int main()
{
fin>>N;
back(1);
fin.close();
fout.close();
return 0;
}