====== Hledání nejkratší cesty jezdcem ======

===== Mapa vzdáleností =====

<code C++>
#include <iostream>

using namespace std;

const int N = 8;

int p [N+1] [N+1]; // mapa vzdalenosti, radek a sloupec 0 nepouzivame

void tisk ()
{
        for (int i = 1; i <= N; i++)
        {
            for (int k = 1; k <= N; k++)
            {
                int v = p[i][k];
                if (v >= 0)
                   cout << v;
                else
                   cout << ".";
                cout << " ";
            }
            cout << endl;
        }
}

void jump (int i, int k, int v = 0)
{
    if (i >= 1 && i <= N && k >= 1 && k <= N)
    {
        if (p [i][k] == -1 || p[i][k] > v)
        {
            p [i][k] = v;

            jump (i+2, k+1, v+1);
            jump (i+2, k-1, v+1);
            jump (i-2, k+1, v+1);
            jump (i-2, k-1, v+1);

            jump (i+1, k+2, v+1);
            jump (i+1, k-2, v+1);
            jump (i-1, k+2, v+1);
            jump (i-1, k-2, v+1);
        }
    }
}

int main ()
{
    for (int i = 0; i <= N; i++)
        for (int k = 0; k <= N; k++)
            p[i][k] = -1;

    jump (1, 1);

    tisk ();
}
</code>

===== Cesta zpět =====

<code C++>
#include <iostream>

using namespace std;

const int N = 8;

int p [N+1] [N+1]; // mapa vzdalenosti, radek a sloupec 0 nepouzivame

int zx [N+1][N+1]; // x-ova souradnice cesty zpet
int zy [N+1][N+1]; // y-ova

void tisk ()
{
        for (int i = 1; i <= N; i++)
        {
            for (int k = 1; k <= N; k++)
            {
                int v = p[i][k];
                if (v >= 0)
                   cout << v;
                else
                   cout << ".";
                cout << " ";
            }
            cout << endl;
        }
}

void zpet (int i, int k)
{
    while (i >= 1 && i <= N && k >= 1 && k <= N)
    {
        cout << i << "," << k << endl;
        int i0 = zx [i][k];
        int k0 = zy [i][k];
        i = i0;
        k = k0;
    }
}

void jinak (int i, int k)
{
    if (i >= 1 && i <= N && k >= 1 && k <= N)
    {
        cout << i << "," << k << endl;
        jinak (zx[i][k], zy[i][k]);
    }
}

void cesta (int i, int k)
{
    if (i >= 1 && i <= N && k >= 1 && k <= N)
    {
        cesta (zx[i][k], zy[i][k]);
        cout << i << "," << k << endl;
    }
}


void jump (int i, int k, int v = 0, int i0 = 0, int k0 = 0)
{
    if (i >= 1 && i <= N && k >= 1 && k <= N)
    {
        if (p [i][k] == -1 || p[i][k] > v)
        {
            p [i][k] = v;
            zx [i][k] = i0;
            zy [i][k] = k0;

            jump (i+2, k+1, v+1, i, k);
            jump (i+2, k-1, v+1, i, k);
            jump (i-2, k+1, v+1, i, k);
            jump (i-2, k-1, v+1, i, k);

            jump (i+1, k+2, v+1, i, k);
            jump (i+1, k-2, v+1, i, k);
            jump (i-1, k+2, v+1, i, k);
            jump (i-1, k-2, v+1, i, k);
        }
    }
}

int main ()
{
    for (int i = 0; i <= N; i++)
        for (int k = 0; k <= N; k++)
        {
            p  [i][k] = -1;
            zx [i][k] = -1;
            zy [i][k] = -1;
        }

    jump (1, 1);

    tisk ();


    cout << endl;
    zpet (8, 8);

    // cout << endl;
    // jinak (8, 8);

    cout << endl;
    cesta (8, 8);
}
</code>