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Cod sursa(job #658096)
#include <fstream>
using namespace std;
int st[25],n,k;
ifstream f("combinari.in");
ofstream g("combinari.out");
void init()
{
int i;
for (i=1;i<=n; i++)
st[i]=0;
}
int valid(int p)
{
int i,ok=1;
for (i=1; i<p; i++)
if (st[i] == st[p] || st[i]>st[p])
ok=0;
return ok;
}
void tipar(int p)
{
int j;
for (j=1; j<=p; j++)
g<<st[j]<<" ";
g<<"\n";
}
void back(int p)
{
int pval;
for (pval=1; pval<=n; pval++)
{
st[p]=pval;
if (valid(p))
{if (p==k)
tipar(p);
else
back(p+1);}
}
}
int main()
{
f>>n>>k;
back(1);
f.close();
g.close();
return 0;
}