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Cod sursa(job #416494)
#include<stdio.h>
#include<algorithm>
using namespace std;
const int N_max=22;
int st[N_max],viz[N_max];
int n,k;
void bkt(int p)
{
int i;
if(p==k+1)
{// afisare;
for(i=1;i<=k;i++)
printf("%d ",st[i]);
printf("\n");
}
else
for(i=1;i<=n;i++)
if(viz[i]==0 && st[p-1]<i)
{
st[p]=i;
viz[i]=1;
bkt(p+1);
viz[i]=0;
}
}
int main()
{
freopen("combinari.in","r",stdin);
freopen("combinari.out","w",stdout);
scanf("%d%d",&n,&k);
bkt(1);
return 0;
}