{"id":1109,"date":"2022-12-02T21:38:34","date_gmt":"2022-12-02T21:38:34","guid":{"rendered":"https:\/\/galaxyinferno.com\/?p=1109"},"modified":"2022-12-12T23:42:40","modified_gmt":"2022-12-12T23:42:40","slug":"how-to-solve-advent-of-code-2022-day-2-with-python","status":"publish","type":"post","link":"https:\/\/galaxyinferno.com\/how-to-solve-advent-of-code-2022-day-2-with-python\/","title":{"rendered":"How to solve Advent of Code 2022 &#8211; Day 2 with Python"},"content":{"rendered":"\n<p>If you missed Day 1 click here: <a href=\"https:\/\/galaxyinferno.com\/how-to-solve-advent-of-code-2022-day-1-with-python\/\">How to solve Advent of Code 2022 \u2013 Day 1 with Python<\/a>, if you want to know why you should participate and try to code the solution for yourself, click here: <a href=\"https:\/\/galaxyinferno.com\/advent-of-code-2022-7-reasons-why-you-should-participate\/\">Advent Of Code 2022 \u2013 7 Reasons why you should participate<\/a>. If you&#8217;re here to see the solution of Day 2, continue reading \ud83d\ude09 <\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"github-repository\">GitHub Repository<\/h2>\n\n\n<p><a href=\"https:\/\/github.com\/GalaxyInfernoCodes\/Advent_Of_Code_2022\">https:\/\/github.com\/GalaxyInfernoCodes\/Advent_Of_Code_2022<\/a><\/p>\n\n\n\n<p>I will upload all of my solutions there &#8211; in the form of Python (or Scala alternatives) notebooks. You have to use your own input for the &#8220;input.txt&#8221; since everyone gets their own and everyone needs to provide a different solution based on their input. <\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"day-2-puzzle\">Day 2 Puzzle<\/h2>\n\n\n<p>On <a href=\"https:\/\/adventofcode.com\/2022\/day\/2\" target=\"_blank\" rel=\"noreferrer noopener\">day 2 of Advent of Code<\/a>, the Christmas elves play rock paper scissor to determine their tent positions. They give us a strategy guide to makes us win, which is our puzzle input and looks like this in the example: <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">A Y \nB X \nC Z <\/code><\/pre>\n\n\n\n<p>First column is what our opponent plays with A=rock, Y=paper, Z=scissors, second column is what we should play, so X=rock, Y=paper, Z=scissors. Our task is to compute the score of the given &#8220;strategy guide&#8221;. <\/p>\n\n\n\n<p>The total score is sum of each row, with the following rules for each row:<\/p>\n\n\n\n<ul>\n<li>points for our chosen shape (1=Rock, 2=Paper, 3=Scissors)<\/li>\n\n\n\n<li>points depending on if we won (0=Loss, 3=Draw, 6=Win)<\/li>\n<\/ul>\n\n\n\n<p>I decided to go for a <strong>mapping using dictionaries to make the code easier to debug<\/strong> and have all these given definitions in one place:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">map_input = {'A': 'Rock', 'B': 'Paper', 'C': 'Scissors', 'X': 'Rock', 'Y': 'Paper', 'Z': 'Scissors'}\npoints_per_shape = {'Rock': 1, 'Paper': 2, 'Scissors': 3}\npoints_per_outcome = {'Lose': 0, 'Draw': 3, 'Win': 6}<\/code><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id=\"part-1\">Part 1<\/h3>\n\n\n<p>First, <strong>read in the input lines<\/strong> from a text file (save the input without any empty lines at the end):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">with open('example.txt', 'r') as f:\n    lines = f.readlines()\n    rounds = [entry.strip() for entry in lines]<\/code><\/pre>\n\n\n\n<p>After that, you have multiple options. You should probably <strong>write a function for checking each round<\/strong>, though you could also just write a loop. I went for a function and also bundled the 9 combinations into the <strong>3 possible outcomes (Draw, Lose or Win)<\/strong>:<\/p>\n\n\n\n<p>Then this is my function to calculate the points based on each text line: <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">def points_per_round(round_string):\n    opponent_shape = map_input[round_string[0]]\n    our_shape = map_input[round_string[2]]\n\n    if opponent_shape == our_shape:\n        return points_per_outcome['Draw'] + points_per_shape[our_shape]\n    elif (opponent_shape, our_shape) in [('Paper', 'Rock'), ('Rock', 'Scissors'), ('Scissors', 'Paper')]:\n        return points_per_outcome['Lose'] + points_per_shape[our_shape]\n    else:\n        return points_per_outcome['Win'] + points_per_shape[our_shape]\n    <\/code><\/pre>\n\n\n\n<ul>\n<li>I &#8220;translate&#8221; the shapes of both players by using the first and third character of the string, <\/li>\n\n\n\n<li>then check if they are the same, which ends in a draw, <\/li>\n\n\n\n<li>a loss for us (determined by all 3 losing combinations) <\/li>\n\n\n\n<li>or a win for us (the other 3 remaining cases), <\/li>\n<\/ul>\n\n\n\n<p>which nets us the appropriate points for the outcome + the points we get for our shape regardless.<\/p>\n\n\n\n<p>The result is then the <strong>sum of all rounds<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">sum([points_per_round(round_string) for round_string in rounds])<\/code><\/pre>\n\n\n<h3 class=\"wp-block-heading\" id=\"part-2\">Part 2<\/h3>\n\n\n<p>Turns out we were wrong and the <strong>second column tells us if we should aim to lose, win or draw<\/strong> in that round. Communication is key, guys. If only we had listened fully to that elf before doing all that work. <\/p>\n\n\n\n<p>I changed my mappings accordingly. <code>map_input<\/code> still decodes the cryptic letters into actual words. <code>points_per_shape<\/code> and <code>points_per_outcome<\/code> stayed the same. The <strong>3 resulting decisions<\/strong> are now:<\/p>\n\n\n\n<ul>\n<li>we choose &#8216;Rock&#8217;\n<ul>\n<li>if the opponent chooses &#8216;Rock&#8217; and we should &#8216;Draw&#8217;<\/li>\n\n\n\n<li>or if they do &#8216;Paper&#8217; and we should &#8216;Lose&#8217;<\/li>\n\n\n\n<li>or they do &#8216;Scissors&#8217; and we should &#8216;Win&#8217;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>similar for when we choose &#8216;Paper&#8217;<\/li>\n\n\n\n<li>the remaining 3 possible combinations then point us to &#8216;Scissors&#8217;<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">map_input = {'A': 'Rock', 'B': 'Paper', 'C': 'Scissors', 'X': 'Lose', 'Y': 'Draw', 'Z': 'Win'}\npoints_per_shape = {'Rock': 1, 'Paper': 2, 'Scissors': 3}\npoints_per_outcome = {'Lose': 0, 'Draw': 3, 'Win': 6}\n\ndef points_per_round2(round_string):\n    opponent_shape = map_input[round_string[0]]\n    our_goal = map_input[round_string[2]]\n\n    if (opponent_shape, our_goal) in [('Rock', 'Draw'), ('Paper', 'Lose'), ('Scissors', 'Win')]:\n        return points_per_outcome[our_goal] + points_per_shape['Rock']\n    elif (opponent_shape, our_goal) in [('Rock', 'Win'), ('Paper', 'Draw'), ('Scissors', 'Lose')]:\n        return points_per_outcome[our_goal] + points_per_shape['Paper']\n    else:\n        return points_per_outcome[our_goal] + points_per_shape['Scissors']\n    <\/code><\/pre>\n\n\n\n<p>The end result is still the sum over all rounds:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">sum([points_per_round2(round_string) for round_string in rounds])<\/code><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Conclusion<\/h2>\n\n\n<p>I think this puzzle will be solved very <strong>differently based on taste<\/strong>. Surely there are some fancy one-liners, but I went for a mapping strategy using dictionaries because I like working with words in my code that I can understand immediately when looking at them (&#8216;Rock&#8217;, &#8216;Paper&#8217; instead of &#8216;A&#8217;, &#8216;B&#8217; etc.). So I got all the translating out of the way first. <\/p>\n\n\n\n<p>You could even go a step further and define loss conditions (for part 1) in a separate array like so:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">loss_conditions = [('Paper', 'Rock'), ('Rock', 'Scissors'), ('Scissors', 'Paper')]<\/code><\/pre>\n\n\n\n<p>This would further <strong>separate the game logic from the coding logic<\/strong> and result in cleaner, shorter if-else conditions. <\/p>\n\n\n\n<p>This is a good exercise for thinking about <strong>how to write easy-to-read code<\/strong> and <strong>how to represent rule-systems<\/strong> in your code. The puzzle in itself was rather boring though after you wrote down all the rules in code, but hey, hopefully I could help someone out \ud83d\ude42 <\/p>\n\n\n\n<p>If you made it this far, feel free to link your solution in the comments or let me know what you think about my approach! <\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you missed Day 1 click here: How to solve Advent of Code 2022 \u2013 Day 1 with Python, if you want to know why you should participate and try to code the solution for yourself, click here: Advent Of Code 2022 \u2013 7 Reasons why you should participate. If you&#8217;re here to see the&hellip; <a class=\"more-link\" href=\"https:\/\/galaxyinferno.com\/how-to-solve-advent-of-code-2022-day-2-with-python\/\">Continue reading <span class=\"screen-reader-text\">How to solve Advent of Code 2022 &#8211; Day 2 with Python<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1111,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[106],"tags":[104,105],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to solve Advent of Code 2022 - Day 2 with Python - Galaxy Inferno<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/galaxyinferno.com\/how-to-solve-advent-of-code-2022-day-2-with-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to solve Advent of Code 2022 - Day 2 with Python - Galaxy Inferno\" \/>\n<meta property=\"og:description\" content=\"If you missed Day 1 click here: How to solve Advent of Code 2022 \u2013 Day 1 with Python, if you want to know why you should participate and try to code the solution for yourself, click here: Advent Of Code 2022 \u2013 7 Reasons why you should participate. 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