Cod sursa(job #1237463)

Utilizator Alex_SimionSimion Alexandru Alex_Simion Data 4 octombrie 2014 10:15:32
Problema Generare de permutari Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.54 kb
#include <fstream>

using namespace std;
ifstream f("permutari.in");
ofstream g("permutari.out");
int n,m,d[300],p[10];

void back(int,int);
int main()
{
    f>>n;
    for(int i=1;i<=n;i++)
    {
        m|=1<<i;
        d[1<<i]=i;
    }
    back(1,m);
    return 0;
}
void back(int poz,int b)
{
    int j;
    if(b==0)
    {
        for(j=1;j<=n;j++)
            g<<p[j]<<' ';
        g<<'\n';
        return;
    }
    for(j=b;j;j-=j&(-j))
    {
        p[poz]=d[j&(-j)];
        back(poz+1,b-(j&(-j)));
    }
}