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Cod sursa(job #788662)
#include<cstdio>
using namespace std;
int sol[20],n;
bool viz[20];
void afis(int l){
for(int i=1;i<=l;i++)
printf("%d ",sol[i]);
printf("\n");
}
void back(int k,int len){
int i;
if(k==len+1)
afis(len);
else{
for(i=sol[k-1]+1;i<=n;i++)
if(!viz[i]){
sol[k]=i;
viz[i]=1;
back(k+1,len);
viz[i]=0;
}
}
}
int main(){
int k;
freopen("combinari.in","r",stdin);
scanf("%d%d",&n,&k);
fclose(stdin);
freopen("combinari.out","w",stdout);
back(1,k);
fclose(stdout);
return 0;
}