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Cod sursa(job #943373)
#include <iostream>
#include<fstream>
using namespace std;
int n,p,a[19];
ifstream f("combinari.in");
ofstream g("combinari.out");
void back(int k)
{ int i;
for(i=a[k-1]+1;i<=n;i++)
{
a[k]=i;
if (k==p)
{ int j;
for (j=1;j<=p;j++) g<<a[j]<<" ";
g<<"\n";
}
else back(k+1);
}
}
int main()
{
a[0]=0;
f>>n>>p;
back(1);
g.close();
return 0;
}