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Cod sursa(job #545066)
#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("combinari.in");
ofstream fout("combinari.out");
int n,p,a[20];
void back(int k)
{
int i;
if(k==p+1)
{
for(i=1;i<=p;i++)
fout<<a[i];
fout<<endl;
}
else
{
if(k>1)
a[k]=a[k-1];
else
a[k]=0;
while(a[k]<n-p+k)
{
a[k]++;
back(k+1);
}
}
}
int main()
{
fin>>n;
fin>>p;
back(1);
return 0;
}