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Cod sursa(job #793594)
#include <fstream>
using namespace std;
ifstream fin("combinari.in");
ofstream fout("combinari.out");
//ifstream fin("f.in");
//ofstream fout("f.out");
int sol[20], n;
void afis(int l)
{
for(int i = 1; i <= l; i++)
fout << sol[i] << " ";
fout << "\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++)
{
sol[k] = i;
back(k + 1, len);
}
}
}
int main()
{
int k;
fin >> n >> k;
back(1,k);
fin.close();
fout.close();
return 0;
}