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Cod sursa(job #387447)
#include<stdio.h>
int n,k,f[23];
void solutie()
{
int i;
for(i=1;i<=n;i++)
if(f[i])
printf("%d ",i);
printf("\n");
}
void back(int poz,int pus)
{
if(n-poz+1<k-pus)
return ;
if(poz==n+1)
solutie();
if(pus<k)
{
f[poz]=1;
back(poz+1,pus+1);
}
f[poz]=0;
back(poz+1,pus);
}
int main ()
{
freopen("combinari.in","r",stdin);
freopen("combinari.out","w",stdout);
scanf("%d%d",&n,&k);
back(1,0);
return 0;
}