{"id":7994,"date":"2023-03-27T06:00:02","date_gmt":"2023-03-27T04:00:02","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=7994"},"modified":"2023-03-03T12:38:36","modified_gmt":"2023-03-03T10:38:36","slug":"27-mar-23","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/27-mar-23\/","title":{"rendered":"TAD de los conjuntos: Producto cartesiano de dos conjuntos"},"content":{"rendered":"<p>Utilizando el tipo abstracto de datos de los conjuntos (https:\/\/bit.ly\/3HbB7fo) definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   productoC :: (Ord a, Ord b) => Conj a -> Conj b -> Conj (a,b)\n<\/pre>\n<p>tal que <code>productoC c1 c2<\/code> es el producto cartesiano de los conjuntos <code>c1<\/code> y <code>c2<\/code>. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   \u03bb> ej1 = inserta 2 (inserta 5 vacio)\n   \u03bb> ej2 = inserta 9 (inserta 4 (inserta 3 vacio))\n   \u03bb> productoC ej1 ej2\n   {(2,3), (2,4), (2,9), (5,3), (5,4), (5,9)}\n<\/pre>\n<p><b>Soluciones<\/b><\/p>\n<p>A continuaci\u00f3n se muestran las <a href=\"#haskell\">soluciones en Haskell<\/a> y las <a href=\"#python\">soluciones en Python<\/a>.<\/p>\n<p><a name=\"haskell\"><\/a><br \/>\n<b>Soluciones en Haskell<\/b><\/p>\n<pre lang=\"haskell\">\nimport TAD.Conjunto (Conj, vacio, inserta, esVacio, menor, elimina)\nimport TAD_Transformaciones_conjuntos_listas (conjuntoAlista, listaAconjunto)\nimport TAD_Union_de_dos_conjuntos (union)\nimport Test.QuickCheck\n\n-- 1\u00aa soluci\u00f3n\n-- ===========\n\nproductoC :: (Ord a, Ord b) => Conj a -> Conj b -> Conj (a,b)\nproductoC c1 c2\n  | esVacio c1 = vacio\n  | otherwise  = agrega mc1 c2 `union` productoC rc1 c2\n  where mc1 = menor c1\n        rc1 = elimina mc1 c1\n\n-- (agrega x c) es el conjunto de los pares de x con los elementos de\n-- c. Por ejemplo,\n--    \u03bb> agrega 2 (inserta 9 (inserta 4 (inserta 3 vacio)))\n--    {(2,3), (2,4), (2,9)}\nagrega :: (Ord a, Ord b) => a -> Conj b -> Conj (a,b)\nagrega x c\n  | esVacio c = vacio\n  | otherwise = inserta (x, mc) (agrega x rc)\n  where mc = menor c\n        rc = elimina mc c\n\n-- La funci\u00f3n union est\u00e1 definida en el ejercicio\n-- \"Uni\u00f3n de dos conjuntos\" que se encuentra en\n-- https:\/\/bit.ly\/3Y1jBl8\n\n-- 2\u00aa soluci\u00f3n\n-- ===========\n\nproductoC2 :: (Ord a, Ord b) => Conj a -> Conj b -> Conj (a,b)\nproductoC2 c1 c2 =\n  foldr inserta vacio [(x,y) | x <- xs, y <- ys]\n  where xs = conjuntoAlista c1\n        ys = conjuntoAlista c2\n\n-- 3\u00aa soluci\u00f3n\n-- ===========\n\nproductoC3 :: (Ord a, Ord b) => Conj a -> Conj b -> Conj (a,b)\nproductoC3 c1 c2 =\n  listaAconjunto [(x,y) | x <- xs, y <- ys]\n  where xs = conjuntoAlista c1\n        ys = conjuntoAlista c2\n\n-- Comprobaci\u00f3n de equivalencia\n-- ============================\n\n-- La propiedad es\nprop_productoC :: Conj Int -> Conj Int -> Bool\nprop_productoC c1 c2 =\n  all (== productoC c1 c2)\n      [productoC2 c1 c2,\n       productoC3 c1 c2]\n\n-- La comprobaci\u00f3n es\n--    \u03bb> quickCheck prop_productoC\n--    +++ OK, passed 100 tests.\n<\/pre>\n<p><a name=\"python\"><\/a><br \/>\n<b>Soluciones en Python<\/b><\/p>\n<pre lang=\"python\">\nfrom __future__ import annotations\n\nfrom abc import abstractmethod\nfrom copy import deepcopy\nfrom functools import reduce\nfrom typing import Protocol, TypeVar\n\nfrom hypothesis import given\n\nfrom src.TAD.conjunto import (Conj, conjuntoAleatorio, elimina, esVacio,\n                              inserta, menor, vacio)\nfrom src.TAD_Transformaciones_conjuntos_listas import (conjuntoAlista,\n                                                       listaAconjunto)\nfrom src.TAD_Union_de_dos_conjuntos import union\n\n\nclass Comparable(Protocol):\n    @abstractmethod\n    def __lt__(self: A, otro: A) -> bool:\n        pass\n\nA = TypeVar('A', bound=Comparable)\nB = TypeVar('B', bound=Comparable)\n\n# 1\u00aa soluci\u00f3n\n# ===========\n\n# (agrega x c) es el conjunto de los pares de x con los elementos de\n# c. Por ejemplo,\n#    >>> agrega(2, inserta(9, inserta(4, inserta(3, vacio()))))\n#    {(2, 3), (2, 4), (2, 9)}\ndef agrega(x: A, c: Conj[B]) -> Conj[tuple[A, B]]:\n    if esVacio(c):\n        return vacio()\n    mc = menor(c)\n    rc = elimina(mc, c)\n    return inserta((x, mc), agrega(x, rc))\n\ndef productoC(c1: Conj[A], c2: Conj[B]) -> Conj[tuple[A, B]]:\n    if esVacio(c1):\n        return vacio()\n    mc1 = menor(c1)\n    rc1 = elimina(mc1, c1)\n    return union(agrega(mc1, c2), productoC(rc1, c2))\n\n# La funci\u00f3n union est\u00e1 definida en el ejercicio\n# \"Uni\u00f3n de dos conjuntos\" que se encuentra en\n# https:\/\/bit.ly\/3Y1jBl8\n\n# 2\u00aa soluci\u00f3n\n# ===========\n\ndef productoC2(c1: Conj[A], c2: Conj[B]) -> Conj[tuple[A, B]]:\n    xs = conjuntoAlista(c1)\n    ys = conjuntoAlista(c2)\n    return reduce(lambda bs, a: inserta(a, bs), [(x,y) for x in xs for y in ys], vacio())\n\n# 3\u00aa soluci\u00f3n\n# ===========\n\ndef productoC3(c1: Conj[A], c2: Conj[B]) -> Conj[tuple[A, B]]:\n    xs = conjuntoAlista(c1)\n    ys = conjuntoAlista(c2)\n    return listaAconjunto([(x,y) for x in xs for y in ys])\n\n# 4\u00aa soluci\u00f3n\n# ===========\n\ndef agrega4Aux(x: A, c: Conj[B]) -> Conj[tuple[A, B]]:\n    r: Conj[tuple[A, B]] = vacio()\n    while not esVacio(c):\n        mc = menor(c)\n        c = elimina(mc, c)\n        r = inserta((x, mc), r)\n    return r\n\ndef agrega4(x: A, c: Conj[B]) -> Conj[tuple[A, B]]:\n    _c = deepcopy(c)\n    return agrega4Aux(x, _c)\n\ndef productoC4(c1: Conj[A], c2: Conj[B]) -> Conj[tuple[A, B]]:\n    r: Conj[tuple[A, B]] = vacio()\n    while not esVacio(c1):\n        mc1 = menor(c1)\n        c1 = elimina(mc1, c1)\n        r = union(agrega4(mc1, c2), r)\n    return r\n\n# 5\u00aa soluci\u00f3n\n# ===========\n\ndef agrega5Aux(x: A, c: Conj[B]) -> Conj[tuple[A, B]]:\n    r: Conj[tuple[A, B]] = Conj()\n    while not c.esVacio():\n        mc = c.menor()\n        c.elimina(mc)\n        r.inserta((x, mc))\n    return r\n\ndef agrega5(x: A, c: Conj[B]) -> Conj[tuple[A, B]]:\n    _c = deepcopy(c)\n    return agrega5Aux(x, _c)\n\ndef productoC5(c1: Conj[A], c2: Conj[B]) -> Conj[tuple[A, B]]:\n    r: Conj[tuple[A, B]] = Conj()\n    while not c1.esVacio():\n        mc1 = c1.menor()\n        c1.elimina(mc1)\n        r = union(agrega5(mc1, c2), r)\n    return r\n\n# Comprobaci\u00f3n de equivalencia\n# ============================\n\n# La propiedad es\n@given(c1=conjuntoAleatorio(), c2=conjuntoAleatorio())\ndef test_productoC(c1: Conj[int], c2: Conj[int]) -> None:\n    r = productoC(c1, c2)\n    assert productoC2(c1, c2) == r\n    assert productoC3(c1, c2) == r\n    assert productoC4(c1, c2) == r\n\n# La comprobaci\u00f3n de las propiedades es\n#    > poetry run pytest -q TAD_Producto_cartesiano.py\n#    1 passed in 0.35s\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Utilizando el tipo abstracto de datos de los conjuntos (https:\/\/bit.ly\/3HbB7fo) definir la funci\u00f3n productoC :: (Ord a, Ord b) => Conj a -> Conj b -> Conj (a,b) tal que productoC c1 c2 es el producto cartesiano de los conjuntos c1 y c2. Por ejemplo, \u03bb> ej1 = inserta 2 (inserta 5 vacio) \u03bb> ej2&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[581],"tags":[331,585],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/7994"}],"collection":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/comments?post=7994"}],"version-history":[{"count":2,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/7994\/revisions"}],"predecessor-version":[{"id":7996,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/7994\/revisions\/7996"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=7994"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=7994"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=7994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}