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Cod sursa(job #913767)
#include <cstdio>
using namespace std;
int a[20];
int n;
void afis(int k){
for(int i = 1; i <= k; ++ i){
printf("%d ", a[i]);
}
printf("\n");
}
void back(int k){
for(int i = a[k - 1] + 1; i <= n; ++ i){
a[k] = i;
afis(k);
back(k + 1);
}
}
int main()
{
freopen("submultimi.in", "r", stdin);
freopen("submultimi.out", "w", stdout);
scanf("%d", &n);
back(1);
return 0;
}