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Cod sursa(job #927061)
#include <fstream>
using namespace std;
ifstream f("combinari.in");
ofstream g("combinari.out");
int x[19], k, n, K;
bool v[19];
void back(int k){
int i;
if(k>K)
{
for(i=1; i<=K; i++)
g<<x[i]<<' ';
g<<"\n";
}
else
{
for(i=x[k-1]+1; i<=n; i++)
{
x[k]=i;
back(k+1);
}
}
}
int main(){
f>>n>>K;
f.close();
back(1);
g.close();
return 0;
}