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2025/03
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Lines changed: 104 additions & 34 deletions

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‎2025/Day03/README.md‎

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## --- Day 3: Lobby ---
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You descend a short staircase, enter the surprisingly vast lobby, and are quickly cleared by the security checkpoint. When you get to the main elevators, however, you discover that each one has a red light above it: they're all <em>offline</em>.
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"Sorry about that," an Elf apologizes as she tinkers with a nearby control panel. "Some kind of electrical surge seems to have fried them. I'll try to get them online soon."
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_Visit the website for the full story and [full puzzle](https://adventofcode.com/2025/day/3) description._

‎2025/Day03/Solution.cs‎

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namespace AdventOfCode.Y2025.Day03;
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using System;
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using System.Linq;
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[ProblemName("Lobby")]
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class Solution : Solver {
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public object PartOne(string input) => MaxJoltSum(input, 2);
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public object PartTwo(string input) => MaxJoltSum(input, 12);
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public long MaxJoltSum(string input, int batteryCount) =>
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input.Split("\n").Select(bank => MaxJolt(bank, batteryCount)).Sum();
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long MaxJolt(string bank, int batteryCount) {
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if (batteryCount == 0) {
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return 0;
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}
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if (bank.Length < batteryCount) {
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return -1;
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}
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for (int jolt = 9; jolt >= 0; jolt--) {
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var index = bank.IndexOf((char)(jolt + '0'));
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if (index >= 0) {
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var res = MaxJolt(bank[(index + 1)..], batteryCount - 1);
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if (res >= 0) {
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return jolt * (long)Math.Pow(10, batteryCount-1) + res;
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}
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}
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}
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throw new Exception();
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}
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}

‎2025/Day03/input.in‎

19.7 KB
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‎2025/Day03/input.refout‎

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173065202451341

‎2025/SplashScreen.cs‎

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Original file line numberDiff line numberDiff line change
@@ -8,22 +8,25 @@ 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 █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ sub y{2025}\n \n");
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Write(0xcc00, false, " ");
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Write(0xffffff, false, "' ____ ' . ");
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Write(0xffff66, true, "* ");
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Write(0xffffff, false, "'. .' . '. ");
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Write(0xcc00, false, " █ █ █ █ █ █▄█\n █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ {'year': 2025}\n ");
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Write(0xcc00, false, " \n ");
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Write(0xffffff, false, "' ' ____ ' ");
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Write(0xffff66, true, "* ");
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Write(0xffffff, false, ". ' '. . . ' ");
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Write(0xff9900, false, "<");
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Write(0xffffff, false, "o ' . \n ________/");
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Write(0xffffff, false, "o ' \n ________/");
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Write(0x999999, false, "O___");
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Write(0xffffff, false, "\\__________");
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Write(0xff0000, false, "|");
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Write(0xffffff, false, "_________________O______ ");
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Write(0xcccccc, false, " 1 ");
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Write(0xffff66, false, "**\n ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, "'' ");
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Write(0x999999, false, "_______");
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Write(0xaabbcc, false, "||");
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Write(0x999999, false, "_________ \n | ");
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Write(0x999999, false, "_________ ");
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Write(0x32211a, false, "' ' ' . . . ' . \n ' ");
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Write(0x999999, false, "| ");
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Write(0x9b715b, false, "_");
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Write(0xbb66ff, false, "@");
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Write(0x9b715b, false, "__ ");
@@ -32,10 +35,10 @@ public void Show() {
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Write(0x66ff, false, "o");
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Write(0x9b715b, false, "_ ");
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Write(0xff0000, false, "'.");
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Write(0x999999, false, "|");
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Write(0x666666, false, "_ _________________________ ");
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Write(0x999999, false, "|_ _________________________ ");
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Write(0xcccccc, false, " 2 ");
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Write(0xffff66, false, "**\n ");
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Write(0xffff66, false, "**\n ");
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Write(0x32211a, false, ". ");
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Write(0x999999, false, "|_");
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Write(0xff0000, false, "&");
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Write(0x999999, false, "_");
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Write(0xaabbcc, false, "^");
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Write(0x9b715b, false, "=");
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Write(0x999999, false, "_");
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Write(0x9b715b, false, "[");
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Write(0x333333, false, " \\| _ .. .. .. | \n \\_]__--|_|___[]_[]_[]__//_| ");
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Write(0x666666, false, " 3\n \n ");
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Write(0x666666, false, " 4\n ");
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Write(0x666666, false, " \n 5\n ");
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Write(0x9b715b, false, "[ ");
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Write(0x999999, false, "\\|");
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Write(0xff00, false, "..' ");
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Write(0xaabbcc, false, "_ ");
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Write(0xff0000, false, ".");
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Write(0x666666, false, ". ");
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Write(0xff0000, false, ".");
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Write(0x666666, false, ". ");
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Write(0xff0000, false, ".");
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Write(0x666666, false, ". ");
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Write(0x999999, false, "| \n \\_");
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Write(0xaabbcc, false, "]");
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Write(0x999999, false, "__");
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Write(0x9b715b, false, "--");
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Write(0xaabbcc, false, "|_|");
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Write(0x999999, false, "___");
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Write(0xaabbcc, false, "[]");
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Write(0x999999, false, "_");
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Write(0xaabbcc, false, "[]");
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Write(0x999999, false, "_");
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Write(0xaabbcc, false, "[]");
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Write(0x999999, false, "__");
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Write(0xaabbcc, false, "//");
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Write(0x999999, false, "_| ");
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Write(0xcccccc, false, " 3 ");
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Write(0xffff66, false, "**\n ");
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Write(0x333333, false, " ____________//___ \n |");
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Write(0x333333, false, " \\ // @@| ");
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Write(0x666666, false, " 4\n ");
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Write(0x333333, false, " |_[#]_@@__//_@@@| \n ");
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Write(0x333333, false, " ");
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Write(0x666666, false, " 5\n \n ");
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Write(0x666666, false, " 6\n ");
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Write(0x666666, false, " \n 7\n ");
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Write(0x666666, false, " \n ");
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Write(0x666666, false, "6\n \n ");
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Write(0x666666, false, " 7\n ");
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Write(0x666666, false, " \n 8\n ");
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Write(0x666666, false, " \n 9");
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Write(0x666666, false, "8\n \n ");
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Write(0x666666, false, " 9\n ");
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Write(0x666666, false, " \n 10\n ");
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Write(0x666666, false, " \n 11");
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Write(0x666666, false, "\n \n ");
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Write(0x666666, false, " 10\n ");
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Write(0x666666, false, " \n 11\n ");
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Write(0x666666, false, " \n 12\n");
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Write(0x666666, false, " \n");
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Write(0x666666, false, " 12\n \n");
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Console.ForegroundColor = color;
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Console.WriteLine();

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