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Cod sursa(job #974807)
#include <fstream>
#define Nmax 20
using namespace std;
fstream f,g;
int n,k;
int viz[Nmax];
void back(int p,int x)
{
int i;
if(p==k)
{
for(i=1;i<=n;++i)
if(viz[i]==1)
g<<i<<" ";
g<<"\n";
}
else
{
for(i=x;i<=n;++i)
if(viz[i]==0)
{
viz[i]=1;
back(p+1,i+1);
viz[i]=0;
}
}
}
int main()
{
f.open("combinari.in",ios::in);
g.open("combinari.out",ios::out);
f>>n>>k;
back(0,1);
f.close();
g.close();
return 0;
}