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Cod sursa(job #256223)
#include <stdio.h>
int st[9],n,k;
void afis(int k)
{
int i;
for (i=1;i<=k;i++)
printf("%d ", st[i]);
printf("\n");
}
int valid(int k)
{
int i;
for (i=1;i<k;i++)
if (st[i]==st[k] || st[i]>st[k])
return 0;
return 1;
}
void back(int k,int p)
{
int x;
for (x=1;x<=n;x++)
{
st[k]=x;
if (valid(k))
if (k==p)
afis(k);
else
back(k+1,p);
}
}
int main()
{
freopen("combinari.in","r",stdin);
freopen("combinari.out","w",stdout);
scanf("%d %d", &n, &k);
back(1,k);
return 0;
}