public static void walkDP(int sX, int sY, int eX, int eY)
    {
        for (int i = eX; i >= sX; i--)
        {// preenchimento base horizontal
            paths[eY][i] = 1;
            if (blocked(i, eY, 'E') == 0)
            {
                for (int k = i; k >= sX; k--)
                    paths[eY][k] = 0;
                break;
            }
        }

        for (int j = eY; j >= sY; j--)
        {// preenchimento base vertical
            paths[j][eX] = 1;
            if (blocked(eX, j, 'N') == 0)
            {
                for (int k = j; k >= sY; k--)
                    paths[k][eX] = 0;
                break;
            }
        }

        for (int i = eX - 1; i >= sX; i--)
        {
            for (int j = eY - 1; j >= sY; j--)
            {
                paths[j][i] = paths[j + 1][i] * blocked(i, j, 'N')
                        + paths[j][i + 1] * blocked(i, j, 'E');
            }
        }
    }