Cod sursa(job #947221)

Utilizator rares96cheseliRares Cheseli rares96cheseli Data 6 mai 2013 22:05:41
Problema Generare de permutari Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.55 kb
#include<fstream>
#include<iostream>

using namespace std;

int n,a[9];

ifstream f("permutari.in");
ofstream g("permutari.out");

bool valid(int k)
{
    for (int i=1;i<k;i++) if (a[k]==a[i]) return false;
    return true;
}

void back(int k)
{
    int i;
    for (i=1;i<=n;i++)
    {
        a[k]=i;
        if (valid(k)) if (k==n)
        {
            for (int j=1;j<=n;j++) g<<a[j]<<' '; g<<'\n';
        }
        else back(k+1);
    }
}

int main()
{
    f>>n;
    back(1);
    f.close(); g.close();
    return 0;
}