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2024/20
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6 files changed

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‎2024/Day20/README.md‎

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## --- Day 20: Race Condition ---
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The Historians are quite pixelated again. This time, a massive, black building looms over you - you're [right outside](/2017/day/24) the CPU!
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While The Historians get to work, a nearby program sees that you're idle and challenges you to a <em>race</em>. Apparently, you've arrived just in time for the frequently-held <em>race condition</em> festival!
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_Visit the website for the full story and [full puzzle](https://adventofcode.com/2024/day/20) description._

‎2024/Day20/Solution.cs‎

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namespace AdventOfCode.Y2024.Day20;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Numerics;
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[ProblemName("Race Condition")]
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class Solution : Solver {
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public object PartOne(string input) => Solve(input, 2);
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public object PartTwo(string input) => Solve(input, 20);
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int Solve(string input, int cheat) {
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var path = GetPath(input);
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// this nested loop is 6x times faster then the same thing with LINQ ¯\_(ツ)_/¯
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var res = 0;
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for (var i = 0; i < path.Length; i++) {
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for (var j = i + 1; j < path.Length; j++) {
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var dist = Manhattan(path[i], path[j]);
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// the index of an element in the path equals to its distance
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// from the finish line
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var saving = j - (i + dist);
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if (dist <= cheat && saving >= 100) {
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res++;
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}
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}
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}
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return res;
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}
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int Manhattan(Complex a, Complex b) =>
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(int)(Math.Abs(a.Imaginary - b.Imaginary) + Math.Abs(a.Real - b.Real));
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// follow the path from start to finish, supposed that there is a single track in the input
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Complex[] GetPath(string input) {
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var lines = input.Split("\n");
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var map = (
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from y in Enumerable.Range(0, lines.Length)
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from x in Enumerable.Range(0, lines[0].Length)
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select new KeyValuePair<Complex, char>(x + y * Complex.ImaginaryOne, lines[y][x])
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).ToDictionary();
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var start = map.Keys.Single(k => map[k] == 'S');
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var goal = map.Keys.Single(k => map[k] == 'E');
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var (prev, cur, dir) = ((Complex?)null, start, Complex.ImaginaryOne);
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var res = new List<Complex> { start };
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while (cur != goal) {
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if (map[cur + dir] == '#' || cur + dir == prev) {
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dir *= Complex.ImaginaryOne;
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} else {
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(prev, cur) = (cur, cur + dir);
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res.Add(cur);
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}
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}
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return res.ToArray();
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}
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}

‎2024/Day20/input.in‎

19.6 KB
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‎2024/Day20/input.refout‎

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‎2024/SplashScreen.cs‎

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Original file line numberDiff line numberDiff line change
@@ -8,8 +8,8 @@ public void Show() {
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var color = Console.ForegroundColor;
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Write(0xcc00, false, " ▄█▄ ▄▄█ ▄ ▄ ▄▄▄ ▄▄ ▄█▄ ▄▄▄ ▄█ ▄▄ ▄▄▄ ▄▄█ ▄▄▄\n █▄█ █ █ █ █ █▄█ █ █ █ █ █ █▄ ");
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Write(0xcc00, false, " █ █ █ █ █ █▄█\n █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ /^2024$/\n \n ");
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Write(0xcc00, false, " ");
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Write(0xcc00, false, " █ █ █ █ █ █▄█\n █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ /* 2024 */\n \n ");
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Write(0xcc00, false, " ");
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Write(0x888888, false, " .-----. .------------------. \n ");
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Write(0xcccccc, false, ".--'");
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Write(0xe3b585, false, "~ ~ ~");
@@ -49,9 +49,9 @@ public void Show() {
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Write(0xcccccc, false, "| 3 ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "|");
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Write(0x4d8b03, false, "@");
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Write(0x7fbd39, false, "#");
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Write(0x5eabb4, false, "..");
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Write(0x488813, false, "@");
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Write(0x7fbd39, false, "#");
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Write(0xe3b585, false, "'. ~ ");
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Write(0xcc00, false, "\" ' ");
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Write(0xe3b585, false, "~ ");
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Write(0xcccccc, false, "| 4 ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "|");
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Write(0x7fbd39, false, "_");
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Write(0x1461f, false, "_");
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Write(0x5eabb4, false, ".~.");
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Write(0x4d8b03, false, "_");
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Write(0x488813, false, "#");
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Write(0x488813, false, "_@");
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Write(0xe3b585, false, "'.. ~ ~ ");
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Write(0xffff66, true, "*");
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Write(0xcccccc, false, "| | ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "| ");
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Write(0xffffff, false, "||| ");
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Write(0x488813, false, "#");
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Write(0x4d8b03, false, "@");
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Write(0x427322, false, "#");
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Write(0x4d8b03, false, "#");
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Write(0x7fbd39, false, "@");
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Write(0x488813, false, "@");
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Write(0x427322, false, "@");
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Write(0xe3b585, false, "'''...");
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Write(0xcccccc, false, "| |");
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Write(0xa25151, false, "... ");
@@ -98,11 +97,11 @@ public void Show() {
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Write(0xcccccc, false, "| 6 ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "|");
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Write(0x7fbd39, false, "@");
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Write(0x427322, false, "@");
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Write(0xffffff, false, "~~~");
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Write(0x488813, false, "@# ");
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Write(0x4d8b03, false, "# ");
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Write(0x488813, false, "# @ ");
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Write(0x1461f, false, "@");
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Write(0x488813, false, "#@#");
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Write(0x4d8b03, false, "# ");
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Write(0xcccccc, false, "| |");
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Write(0xa5a8af, false, "/\\ ");
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Write(0xa25151, false, "''. ");
@@ -169,18 +168,16 @@ public void Show() {
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Write(0xffff66, true, ":");
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Write(0x333333, false, "::");
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Write(0xcccccc, false, "| | ");
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Write(0xffffff, false, ". ");
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Write(0xa2db, false, ". ");
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Write(0xffffff, false, ". ");
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Write(0xcccccc, false, "| 12 ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "|");
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Write(0xffffff, false, "'. - -");
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Write(0xcccccc, false, "| | ");
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Write(0x333333, false, "::");
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Write(0xcccccc, false, "| | ");
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Write(0x333333, false, ".::");
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Write(0x9900, true, ":");
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Write(0x333333, false, "::");
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Write(0xcccccc, false, "| |");
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Write(0x91cc, false, "' ");
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Write(0xcccccc, false, "| | ");
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Write(0xffffff, false, ".' ");
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Write(0xcccccc, false, "| 13 ");
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Write(0xffff66, false, "**\n ");
@@ -215,7 +212,8 @@ public void Show() {
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Write(0x5555bb, false, "~ ");
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Write(0xcc00, false, "'.");
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Write(0xcccccc, false, "| |");
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Write(0x666666, false, " : ");
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Write(0x333333, false, ".");
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Write(0x666666, false, ": ");
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Write(0x333333, false, "::");
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Write(0x553322, true, ":");
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Write(0x333333, false, "::");
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Write(0x5555bb, false, "~ ");
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Write(0xcc00, false, ":");
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Write(0xcccccc, false, "| |");
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Write(0x666666, false, " '. ");
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Write(0x666666, false, " '. ");
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Write(0x333333, false, ". .");
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Write(0xcccccc, false, "| |");
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Write(0x666666, false, "┬o┤ten├─");
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Write(0xcccccc, false, "| 17 ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "| ");
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Write(0xcc00, false, "'..' .'");
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Write(0xcccccc, false, "| |");
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Write(0x666666, false, " '");
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Write(0xcccccc, false, "| | ");
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Write(0x333333, false, ".");
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Write(0x666666, false, "'");
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Write(0x456efe, true, "o ");
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Write(0xcccccc, false, "| |");
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Write(0x666666, false, "┘");
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Write(0xcccccc, false, "| |");
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Write(0x666666, false, "─┘├┬┬┬┴─");
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Write(0xcccccc, false, "| 19 ");
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Write(0xffff66, false, "**\n ");
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Write(0xcccccc, false, "|");
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Write(0xcc00, false, "'''");
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Write(0xcccccc, false, ")) | | ");
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Write(0xbee4e7, true, "o ");
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Write(0xffff66, true, "*");
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Write(0x666666, false, " : ");
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Write(0xcccccc, false, "'. .'");
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Write(0x666666, false, "──┘");
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Write(0x9900, false, ">>");
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Write(0xff9900, true, "o");
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Write(0x9900, false, "<<");
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Write(0xcccccc, false, "| 20 ");
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Write(0xffff66, false, "**\n ");
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Write(0x333333, false, " | | | '. .' | ");
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Write(0x666666, false, "20\n 21\n ");
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Write(0x666666, false, " 22\n 23\n ");
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Write(0x666666, false, " 24\n ");
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Write(0x666666, false, " 25\n \n");
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Write(0x333333, false, ".------' '------. | '' | ");
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Write(0x666666, false, "21\n 22\n ");
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Write(0x666666, false, " 23\n 24\n ");
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Write(0x666666, false, " 25\n \n");
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Console.ForegroundColor = color;
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Console.WriteLine();

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