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Cod sursa(job #462055)
#include<fstream>
using namespace std;
ifstream f("permutari.in");ofstream g("permutari.out");
int n,x[9];
void afis()
{
int i;
for(i=1;i<=n;i++)g<<x[i]<<' ';
g<<'\n';
}
void schimb(int &a,int &b)
{
int aux=a;a=b;b=aux;
}
int main()
{
f>>n;
int i,j;
for(i=1;i<=n;i++)x[i]=i;
do{
afis();
for(i=n-1;i && x[i]>=x[i+1];i--);
if(i)
{
for(j=n;j>=i+1 && x[j]<=x[i];j--);
schimb(x[i],x[j]);
for(j=i+1;j<=(n+i+1)/2;j++)schimb(x[j],x[n+i+1-j]);
}
}while(i);
f.close();g.close();
return 0;
}