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Cod sursa(job #568712)
#include<fstream.h>
int x[19],n,p;
ifstream f("combinari.in");
ofstream g("combinari.out");
int valid(int k)
{
for(int i=1;i<k;i++)
if(x[k]<=x[i])
return 0;
return 1;
}
void back(int k)
{
int i;
if(k==p+1)
{
for(i=1;i<=p;i++)
g<<x[i];
g<<'\n';
}
else
for(i=1;i<=n;i++)
{
x[k]=i;
if(valid(k))
back(k+1);
}
}
int main()
{
f>>n>>p;
back(1);
f.close();
g.close();
return 0;
}