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Cod sursa(job #798411)
#include <fstream>
using namespace std;
bool pus[10000];
int a[10000],sol[10000],n,i;
ifstream f("permutari.in");
ofstream g("permutari.out");
void afis ()
{
int i;
for (i=1;i<=n;i++) g<<a[sol[i]]<<" ";
g<<'\n';
}
void back(int k)
{
int i;
if (k>n) afis();
else for (i=1;i<=n;i++)
if (!pus[i])
{
sol[k]=i;
pus[i]=true;
back(k+1);
pus[i]=false;
}
}
int main()
{
f>>n;
for (i=1;i<=n;i++) a[i]=i;
back(1);
f.close();
g.close();
return 0;
}