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Cod sursa(job #498093)
#include<fstream>
using namespace std;
ifstream f("permutari.in");
ofstream g("permutari.out");
int n;
int a[10]={0,0,2,4,6,8,10,12,14};
bool viz[10];
char s[20]=" ";
void back(int k);
int main()
{
f>>n;
s[a[n]+1]='\0';
back(1);
f.close();
g.close();
return 0;
}
void back(int k)
{
int i;
for (i=1;i<=n;++i)
if (!viz[i])
{
viz[i]=true;
s[a[k]]='0'+i;
if (k<n)
back(k+1);
else
g<<s<<'\n';
viz[i]=false;
}
}