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Cod sursa(job #151640)
#include<fstream>
using namespace std;
int n,used[10],st[9],nr;
ifstream f("permutari.in");
ofstream g("permutari.out");
void back(int k)
{
int i;
if(k==n+1){
for(i=1;i<=n;i++)
g<<st[i]<<" ";
g<<endl;
nr--;
return;}
i=0;
do{
++i;
while(used[i]) ++i;
if(i>n) return;
st[k]=i;
used[i]=1;
back(k+1);
if(!nr) return;
used[i]=0;
}while(1);
}
int main()
{
f>>n;
nr=1;
for(int i=2;i<=n;i++) nr=nr*i;
back(1);
g.close();
}