Cod sursa(job #1567987)

Utilizator iulian_f2kGuraliuc Iulian iulian_f2k Data 13 ianuarie 2016 20:41:44
Problema Problema Damelor Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.26 kb
#include <iostream>
#include <fstream>
#define nmax 14
using namespace std;

int x[nmax],n,ok,viz[nmax],nrsol;


bool validare(int k)
{
    for(int i=1; i<k; i++)
    {
        if((x[i]-i == x[k]-k) || (x[i]-i == x[k]+k-2*i))
            return 0;
    }
    return 1;
}

void backtracking(int k)
{
    if(k>n)
    {


        if(ok==1)
        {
            if(n%2==1 && x[1]==n/2+1)
                nrsol--;

            nrsol+=2;
        }
        else
        {
            for(int j=1; j<=n; j++)
                cout<<x[j]<<' ';
            cout<<'\n';
            {
                if(n%2==1 && x[1]==n/2+1)
                    nrsol--;

                nrsol+=2;
            }
            ok=1;
        }

    }
    else
        for(int i=1; i<=(k==1? (n%2==1? n/2+1: n/2): n); i++)
        {
            x[k]=i;
            if(!viz[i])
            {
                if(validare(k))
                {
                    viz[i]=1;
                    backtracking(k+1);
                    viz[i]=0;
                }
            }
        }
}

int main()
{
    freopen("damesah.in","rt",stdin);
    freopen("damesah.out","wt",stdout);

    cin>>n;
    backtracking(1);
    cout<<nrsol<<'\n';
    return 0;
}