Done puzzle 42

diff --git a/euler42.ipynb b/euler42.ipynb
new file mode 100644 (file)
index 0000000..5695b97
--- /dev/null
+++ b/euler42.ipynb
@@ -0,0 +1,350 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[\"A\", \"ABILITY\", \"ABLE\", \"ABOUT\", \"ABOVE\", \"ABSENCE\", \"ABSOLUTELY\", \"ACADEMIC\", \"ACCEPT\", \"ACCESS\", \"ACCIDENT\"]"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "words = File.read(\"p042_words.txt\").split(\",\").map {|w| w[1..-2]}\n",
+    "words[0..10]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       ":grow"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "require 'singleton'\n",
+    "\n",
+    "class TriangleN\n",
+    "  include Enumerable\n",
+    "  include Singleton\n",
+    "\n",
+    "  def initialize\n",
+    "    @tns = [1]\n",
+    "  end\n",
+    "  \n",
+    "  def is_triangle?(n)\n",
+    "    self.grow(n)\n",
+    "    @tns.include?(n)\n",
+    "  end\n",
+    "  \n",
+    "  def grow(n)\n",
+    "    while n > @tns[-1]\n",
+    "      @tns += [(@tns.length+1) * (@tns.length+2) / 2]\n",
+    "    end\n",
+    "  end\n",
+    "end"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "#<TriangleN:0x00563e39321180 @tns=[1]>"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "trins = TriangleN.instance"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "true"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "trins.is_triangle? 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "false"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "trins.is_triangle? 11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       ":triangle_sum?"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "class String\n",
+    "  \n",
+    "  @@triangles = TriangleN.instance\n",
+    "  \n",
+    "  def to_nums\n",
+    "    self.chars.map {|c| c.ord - 'A'.ord + 1}\n",
+    "  end\n",
+    "  \n",
+    "  def num_sum\n",
+    "    self.to_nums.sum\n",
+    "  end\n",
+    "  \n",
+    "  def triangle_sum?\n",
+    "    @@triangles.is_triangle?(self.num_sum)\n",
+    "  end\n",
+    "end"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[19, 11, 25]"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "\"SKY\".to_nums"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "55"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "\"SKY\".num_sum"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "true"
+      ]
+     },
+     "execution_count": 9,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "trins.is_triangle? \"SKY\".num_sum"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "true"
+      ]
+     },
+     "execution_count": 10,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "\"SKY\".triangle_sum?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "162"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "words.select {|w| w.triangle_sum?}.length"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[\"A\", \"ABILITY\", \"ABOVE\", \"ACCOMPANY\", \"ACHIEVEMENT\", \"AGENCY\", \"AGREE\", \"AIR\", \"ALREADY\", \"AN\", \"ANCIENT\", \"APPARENT\", \"APPOINT\", \"APPROACH\", \"ASSUME\", \"AT\", \"ATMOSPHERE\", \"BAG\", \"BAND\", \"BANK\", \"BAR\", \"BEAT\", \"BELONG\", \"BENEATH\", \"BONE\", \"BOTH\", \"BRIDGE\", \"BUILDING\", \"BURN\", \"CALL\", \"CAPACITY\", \"CAREFUL\", \"CASE\", \"CHILD\", \"CIVIL\", \"CLOSELY\", \"COME\", \"CONFIDENCE\", \"CONFIRM\", \"CONSERVATIVE\", \"CONSTRUCTION\", \"CONTENT\", \"COULD\", \"CURRENTLY\", \"DECISION\", \"DEFINITION\", \"DEMOCRATIC\", \"DEPUTY\", \"DESPITE\", \"DISTINCTION\", \"EAST\", \"EDGE\", \"EDUCATIONAL\", \"EFFECT\", \"EQUIPMENT\", \"EVENT\", \"FACE\", \"FAIL\", \"FAMILY\", \"FEEL\", \"FIELD\", \"FIGURE\", \"FLOOR\", \"FREEDOM\", \"FUND\", \"FUTURE\", \"GENTLEMAN\", \"GREY\", \"GROWTH\", \"HAIR\", \"HAPPY\", \"HAVE\", \"HERE\", \"HIS\", \"IF\", \"INCIDENT\", \"INCREASED\", \"INCREASINGLY\", \"INDIVIDUAL\", \"INSTRUMENT\", \"INTEND\", \"INTENTION\", \"IS\", \"LAW\", \"LEADER\", \"LEAVE\", \"LENGTH\", \"LESS\", \"LITTLE\", \"LOVELY\", \"MAN\", \"MATCH\", \"MERELY\", \"MILK\", \"MISTAKE\", \"MOVE\", \"MUCH\", \"NEED\", \"NOTICE\", \"OBJECT\", \"OBJECTIVE\", \"OF\", \"OIL\", \"ONLY\", \"OTHER\", \"OURSELVES\", \"PART\", \"PASS\", \"PATH\", \"PERFORM\", \"PRISON\", \"PRIVATE\", \"PROBABLY\", \"PROCEDURE\", \"QUALITY\", \"QUESTION\", \"RANGE\", \"READ\", \"REAL\", \"RELIEF\", \"REMOVE\", \"REPRESENT\", \"REQUEST\", \"RESPOND\", \"RIDE\", \"SAMPLE\", \"SAY\", \"SEAT\", \"SECURITY\", \"SINGLE\", \"SKY\", \"SOIL\", \"SOLICITOR\", \"SONG\", \"SOUTHERN\", \"SPIRIT\", \"START\", \"SUGGESTION\", \"TALL\", \"TAX\", \"THEORY\", \"THREATEN\", \"THROUGHOUT\", \"TITLE\", \"TOOTH\", \"TOTALLY\", \"TRAVEL\", \"TYPE\", \"UNABLE\", \"UNDERSTAND\", \"UPON\", \"USE\", \"VARIOUS\", \"VARY\", \"VIDEO\", \"WAGE\", \"WARM\", \"WATCH\", \"WE\", \"WHILST\", \"WIDELY\", \"WOMAN\"]"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "words.select {|w| w.triangle_sum?}"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "\"#<TriangleN:0x00563e39321180 @tns=[1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210]>\""
+      ]
+     },
+     "execution_count": 13,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "trins.inspect"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Ruby 2.4.0",
+   "language": "ruby",
+   "name": "ruby"
+  },
+  "language_info": {
+   "file_extension": ".rb",
+   "mimetype": "application/x-ruby",
+   "name": "ruby",
+   "version": "2.4.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}

diff --git a/p042_words.txt b/p042_words.txt
new file mode 100644 (file)
index 0000000..7177624
--- /dev/null
+++ b/p042_words.txt
@@ -0,0 +1 @@
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