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Cod sursa(job #789999)
#include<iostream>
#include<fstream>
#include<cstdio>
using namespace std;
long n, st[20];
FILE *g;
ifstream f ("submultimi.in");
void afis(int k)
{
int j;
for(j=1; j<=k; j++)
fprintf(g, "%d ", st[j]);
fprintf(g, "\n");
}
void back(int k)
{
int i, j;
for(i=st[k-1]+1; i<=n; i++)
{
st[k]=i;
afis(k);
if(k<n)
back(k+1);
}
}
int main()
{
g=fopen("submultimi.out", "w");
f>>n;
back(1);
}