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Cod sursa(job #659870)
// toate permutarile de n elemente in ordine lexicografica
#include<fstream.h>
long p[100],n,i,k,poz,min,j,aux;
ifstream fin("permutari.in");
ofstream fout("permutari.out");
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{
p[i]=i;
fout<<p[i]<<' ';
}
fout<<'\n';
do
{
poz=n;
while(p[poz]<p[poz-1] && poz>1) poz--;
poz--;
if(poz)
{
min = p[poz+1];
j=poz+1;
k=0;
for(i=poz+1;i<=n&&k==0;i++)
if(min>p[i] && p[i]>p[poz])
{
min = p[i];
j=i;
k=1;
}
aux=p[poz];
p[poz]=p[j];
p[j]=aux;
for(i=1;i<=(n-poz)/2;i++)
{
aux=p[poz+i];
p[poz+i]=p[n-i+1];
p[n-i+1]=aux;
}
for(i=1;i<=n;i++)
fout<<p[i]<<' ';
fout<<'\n';
}
}
while(poz);
fout.close();
return 0;
}