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Cod sursa(job #913646)
#include<fstream>
using namespace std;
ifstream fin("permutari.in");
ofstream fout("permutari.out");
int x[31],s[31],n;
void tipar()
{
int i;
for(i=1;i<=n;i++)
fout<<x[i]<<' ';
fout<<'\n';
}
void back()
{
int k;
k=1;
while(k>0)
{
while(x[k]<n)
{
x[k]=x[k]+1;
if(s[x[k]]==0)
if(k==n) tipar();
else {s[x[k]]=1;k++;x[k]=0;}
}
k--;
s[x[k]]=0;
}
}
int main()
{
fin>>n;
back();
fin.close();
fout.close();
return 0;
}