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Cod sursa(job #155240)
#include<stdio.h>
#define N 19
int n,k,st[N],k1,use[N];
void tipar()
{
int i;
for(i=1;i<k;i++)
printf("%d ",st[i]);
printf("%d\n",st[k]);
}
void back(int k1)
{
int i;
if(k1==k+1)
tipar();
else
for(i=st[k1-1]+1;i<=n;i++)
if(!use[i])
{
st[k1]=i;
use[i]=1;
back(k1+1);
use[i]=0;
}
}
int main()
{
freopen("combinari.in","r",stdin);
freopen("combinari.out","w",stdout);
scanf("%d%d",&n,&k);
back(1);
return 0;
}