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Cod sursa(job #670114)
#include<cstdio>
using namespace std;
int n, st[20];
void read ()
{
freopen ("submultimi.in", "r", stdin);
freopen ("submultimi.out", "w", stdout);
scanf("%d", &n);
}
void back()
{
int i;
for(i=1;i<=st[0];i++)
printf("%d ", st[i]);
if(st[0])
printf("\n");
for(i=st[st[0]]+1;i<=n;i++)
{
st[++st[0]]=i;
back();
st[st[0]]=0;
st[0]--;
}
}
int main()
{
read();
back ();
return 0;
}