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Cod sursa(job #155011)
#include<fstream.h>
long n,q,k,st[19],v[19];
ofstream g("combinari.out");
void tipar()
{for(int i=1;i<=q;i++)
g<<st[i]<<" ";
g<<'\n';
}
void back(int k)
{if(k>q)tipar();
else
{for(int i=st[k-1]+1;i<=n;i++)
if(!v[i]){st[k]=i;v[i]=1;back(k+1);v[i]=0;}
}
}
int main()
{ifstream f("combinari.in");
f>>n>>q;
f.close();
back(1);
g.close();
return 0;
}