Cod sursa(job #1237459)

Utilizator Alex_SimionSimion Alexandru Alex_Simion Data 4 octombrie 2014 10:11:19
Problema Generare de permutari Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.61 kb
#include <fstream>
#include <vector>

using namespace std;
ifstream f("permutari.in");
ofstream g("permutari.out");
int n,m,d[300];
vector<int> p;
void back(int);
int main()
{
    f>>n;
    for(int i=1;i<=n;i++)
    {
        m|=1<<i;
        d[1<<i]=i;
    }
    back(m);
    return 0;
}
void back(int b)
{
    int j;
    if(b==0)
    {
        for(vector<int>::iterator it=p.begin();it!=p.end();it++)
            g<<*it<<' ';
        g<<'\n';
        return;
    }
    for(j=b;j;j-=j&(-j))
    {
        p.push_back(d[j&(-j)]);
        back(b-(j&(-j)));
        p.pop_back();
    }
}