graph_coloring.ipynb

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   "cell_type": "markdown",
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   "source": [
    "# Finger 3: Graph Coloring"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Alumno: Juan Pablo Rombolá"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 154,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "# Algoritmo de tipo Greedy\n",
    "# Ahora empieza con los nodos con mayor centralidad\n",
    "nombre_archivo = \"gc_1000_1\"\n",
    "\n",
    "entrada = sc.textFile(nombre_archivo + \".txt\", 8)\n",
    "header = entrada.take(1)[0]\n",
    "cantidad_vertices = int(header.split()[0])\n",
    "\n",
    "nodo_adyacentes = (entrada.filter(lambda  line: line != header)\\\n",
    "                        .map(lambda line: (int(line.split()[0]), [int(line.split()[1])]))\\\n",
    "                        + entrada.filter(lambda  line: line != header)\\\n",
    "                        .map(lambda line: (int(line.split()[1]), [int(line.split()[0])])))\\\n",
    "                        .reduceByKey(lambda a,b: a + b)\\\n",
    "                        .sortBy(lambda a: -len(a[1]))\\\n",
    "                        .collect()\n",
    "\n",
    "resultado = [-1] * cantidad_vertices\n",
    "for par in nodo_adyacentes:\n",
    "    colores_usados = sc.parallelize(par[1], 8)\\\n",
    "                        .map(lambda a: resultado[a])\\\n",
    "                        .collect()\n",
    "            \n",
    "    color_actual = sc.parallelize(range(0, max(colores_usados) + 2), 8)\\\n",
    "                    .filter(lambda a: a not in colores_usados)\\\n",
    "                    .takeOrdered(1, lambda a: a)\n",
    "            \n",
    "    resultado[par[0]] = color_actual[0]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 156,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Salida\n",
    "dir_salida = nombre_archivo + \"_resultado.txt\"\n",
    "with open(dir_salida, \"w\") as outfile:\n",
    "    outfile.write( str(max(resultado) + 1) + \"\\n\" )\n",
    "    for i in range(cantidad_vertices):\n",
    "        if i == (cantidad_vertices - 1):\n",
    "            outfile.write( str(resultado[i]) )\n",
    "        else:\n",
    "            outfile.write( str(resultado[i]) + \"\\n\" )"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 157,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Bien coloreado\n"
     ]
    }
   ],
   "source": [
    "# Verificación de color          \n",
    "entrada = sc.textFile(nombre_archivo + \"_resultado.txt\")\n",
    "header = entrada.take(1)[0]\n",
    "resultado = entrada.filter(lambda  line: line != header)\\\n",
    "                .map(lambda line: int(line)).collect()\n",
    "\n",
    "for par in nodo_adyacentes:\n",
    "    for i in par[1]:\n",
    "        if resultado[par[0]] == resultado[i]:\n",
    "            print \"Mal coloreado\"\n",
    "print \"Bien coloreado\""
   ]
  }
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