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Cod sursa(job #889918)
#include <fstream>
#include <iostream>
using namespace std;
int n,nr=-1,v[22];
ifstream f("submultimi.in");
ofstream g("submultimi.out");
void back()
{
int i;
for(i=1 ; i<=v[0] ; i++)
g<<(v[i])<<" ";
if(v[0])
g<<('\n');
for (i=v[v[0]]+1 ; i<=n ; i++)
{ v[++v[0]]=i;
back();
v[v[0]]=0;
v[0]--;
}
}
int main()
{ f>>n;
back();
return 0;
}