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Cod sursa(job #615706)
#include <stdio.h>
using namespace std;
int n,p;
bool a,sol[100];
void afisare()
{
int i;
a=false;
for(i=1;i<=n;i++)
if(sol[i]) a=true;
if(a==false) return;
for(i=1;i<=n;i++)
if(sol[i]) printf("%d ",i);
printf("\n");
}
void bkt(int p)
{
int i;
if(p==n+1)
{
afisare();
return;
}
sol[p]=false;
bkt(p+1);
sol[p]=true;
bkt(p+1);
}
int main()
{
freopen("submultimi.in","r",stdin);
freopen("submultimi.out","w",stdout);
scanf("%d",&n);
bkt(1);
return 0;
}