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Cod sursa(job #966167)
#include <cstdio>
using namespace std;
int st[20],n;
void afisare(int k)
{
int i;
for(i=1;i<k;i++)
printf("%d ",st[i]);
printf("%d\n",st[k]);
}
void back(int k)
{
int i;
for(i=st[k-1]+1;i<=n;i++)
{
st[k]=i;
afisare(k);
back(k+1);
}
}
int main()
{
freopen("submultimi.in","r",stdin);
freopen("submultimi.out","w",stdout);
scanf("%d",&n);
st[0]=0;
back(1);
return 0;
}