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def longest_palindrome_constant_space(s):

    N = len(s)

    if N == 0:
        return 0
    elif N == 1:
        return 1
    elif N == 2:
        return 1 + (s[0] == s[1])

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def lcs(s1, s2):

    def lcs_(s1, s2, m, n):

        if (m < 0) or (n < 0):
            return 0

        elif s1[m] == s2[n]:
            return 1 + lcs_(s1, s2, m - 1, n - 1)

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# egg_drop.py
#
# Solution to the general egg drop problem via:
#
# 1. A recursive-memoized algorithm
# 2. A bottom-up table construction
#
# (C) 2017 J. Arrieta, Nabla Zero Labs
# MIT License.

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// -*- coding:utf-8; mode:c++; mode:auto-fill; fill-column:80; -*-

/// @file      example-linspace.cpp
/// @brief     Sample use of Nabla Zero Labs' linspace utilities.
/// @author    J. Arrieta <Juan.Arrieta@nablazerolabs.com>
/// @date      November 01, 2017
/// @copyright (c) 2017 Nabla Zero Labs
/// @license   MIT License

// C++ Standard Library

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// -*- coding:utf-8; mode:c++; mode:auto-fill; fill-column:80; -*-

/// @file      SecureMemoryRegion.cpp
/// @brief     Provide region of memory that never swaps to disk.
/// @author    J. Arrieta <Juan.Arrieta@nablazerolabs.com>
/// @date      October 15, 2017
/// @copyright (c) 2017 Nabla Zero Labs
///
///     $ clang++ -o SecureMemoryRegion SecureMemoryRegion.cpp -std=c++1z \
///     -Wall -Wextra -Ofast -march=native

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// -*- coding:utf-8; mode:c++; mode:auto-fill; fill-column:80; -*-

/// @file      sha256.cpp
/// @brief     Calculate and display the SHA-256 hash of a list of files.
/// @author    J. Arrieta <Juan.Arrieta@nablazerolabs.com>
/// @date      October 10, 2017
/// @copyright (c) 2017 Nabla Zero Labs
/// @license   MIT License
///
/// Compiled in macOS High Sierra 10.13 (previous installation of OpenSSL 1.1.0).

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// -*- coding:utf-8; mode:c++; mode:auto-fill; fill-column:80; -*-

/// @file      cascade-classifier.cpp
/// @brief     OpenCV object recognition example.
/// @author    J. Arrieta <juan.arrieta@nablazerolabs.com>
/// @date      October 04, 2017
/// @copyright (c) 2017 Nabla Zero Labs
/// @license   MIT License.
///
/// I wrote this example program for my later reference.

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"""spk.py

This is an example meant to demonstrate how could one work directly
with SPICE SPK files in their original DAF format.

It can correctly compute the position and velocity provided by Type II
and Type III ephemerides. As a basis for comparison it calculates the
states of the Galilean satellites for a relatively large number of
epochs and compares it agains CSPICE (which you need to have available
as a shared library if you want to run the test case, but you don't

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// -*- coding:utf-8; mode:c++; mode:auto-fill; fill-column:80; -*-

/// @file      color.hpp
/// @brief     Output stream manipulators to add ANSI console colors.
/// @author    J. Arrieta <Juan.Arrieta@nablazerolabs.com>
/// @date      March 14, 2017
/// @copyright (c) 2017 Nabla Zero Labs
///
/// This code is released under The MIT License
///

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// -*- coding:utf-8; mode:c++; mode:auto-fill; fill-column:80; -*-

/// @file list.hpp
/// @brief A minimal list implementation copying the style of the C++
///        Standard Library --- it is meant for educational purposes.
/// @author J. Arrieta <Juan.Arrieta@nablazerolabs.com>
/// @copyright Copyright (c) 2016 Nabla Zero Labs. All rights reserved.
/// @license This software is released under the MIT License.
/// @warning Do not use this turd in production code, or for anything that is
///          not strictly educational. Just use std::list (actually you most