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#include <iostream>
#include<fstream>
using namespace std;
ifstream f("submultimi.in");
ofstream g("submultimi.out");
int n;
int i;
int v[25];
void backTracking(int k, int poz)
{
int i = poz;
while(i <= n)
{
v[k] = i;
for(int j = 1; j <= k; j++)
g << v[j] <<" ";
g << '\n';
if(k != n)
backTracking(k + 1, i + 1);
i++;
}
}
int main() {
f >> n;
backTracking(1, 1);
}