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Cod sursa(job #262481)
#include <fstream>
using namespace std;
int n,s;
fstream f;
fstream g;
int st[20];
int valid(int k)
{
int i;
for(i=1;i<k;i++)
if(st[k]<=st[i])
return 0;
return 1;
}
void back(int k)
{
int i,j;
for(i=1;i<=n;i++)
{
st[k]=i;
if(valid(k))
if(k==s)
{
for(j=1;j<=s;j++)
g << st[j] << " ";
g << "\n";
}
else
back(k+1);
}
}
int main()
{
f.open("combinari.in",fstream::in);
f >> n >> s;
f.close();
g.open("combinari.out",fstream::out);
back(1);
g.close();
return 0;
}