Cod sursa(job #1657523)

Utilizator SolcanMihaiSolcan Mihai Andrei SolcanMihai Data 20 martie 2016 15:55:42
Problema Problema Damelor Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 1.42 kb
#include <cstdio>

using namespace std;

int n;
int nr = 0;
int nrDame = 0;

int coloana[15];
bool coloanaFolosita[15];

void citire()
{
    scanf("%d", &n);
}

bool isValid(int k, int l)
{
    for(int i = 0; i < k; i++)
    {
        int tmp1 = k - i;
        int tmp2 = l - coloana[i];

        if(tmp1 < 0)
        {
            tmp1 = -tmp1;
        }

        if(tmp2 < 0)
        {
            tmp2 = -tmp2;
        }

        if(tmp1 == tmp2)
        {
            return false;
        }
    }

    return true;
}

void afisare()
{
    for(int i = 0; i < n; i++)
    {
        printf("%d ", coloana[i] + 1);
    }

    printf("\n");
}

void backtrack(int k)
{
    if(k == n)
    {
        if(nr == 0)
        {
            afisare();
        }

        nr++;
    }
    else
    {
        for(int i = 0; i < n; i++)
        {
            if(coloanaFolosita[i] == false)
            {
                if(isValid(k, i))
                {
                    coloana[k] = i;
                    coloanaFolosita[i] = true;
                    backtrack(k + 1);
                    coloana[k] = 0;
                    coloanaFolosita[i] = false;
                }
            }
        }
    }
}

int main()
{
    freopen("damesah.in", "r", stdin);
    freopen("damesah.out", "w", stdout);

    citire();
    backtrack(0);

    printf("%d", nr);

    return 0;
}