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2025/06
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‎2025/Day06/README.md‎

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## --- Day 6: Trash Compactor ---
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After helping the Elves in the kitchen, you were taking a break and helping them re-enact a movie scene when you over-enthusiastically jumped into the garbage chute!
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A brief fall later, you find yourself in a garbage smasher. Unfortunately, the door's been magnetically sealed.
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_Visit the website for the full story and [full puzzle](https://adventofcode.com/2025/day/6) description._

‎2025/Day06/Solution.cs‎

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namespace AdventOfCode.Y2025.Day06;
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using System.Collections.Generic;
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using System.Linq;
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record Problem(char op, IEnumerable<long> nums);
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[ProblemName("Trash Compactor")]
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class Solution : Solver {
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// Split the input to separate blocks first, then parse them row by row
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// in part one. We can deal with part two by applying Transpose to the blocks
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// first. The operator moves from the bottom-left corner to the top-right:
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// "15" "1 +"
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// " 5" becomes "55 "
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// "+ "
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public object PartOne(string input) => Solve(
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from rows in ParseBlocks(input)
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select new Problem(
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rows.Last()[0],
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rows[..^1].Select(long.Parse)
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)
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);
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public object PartTwo(string input) => Solve(
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from cols in ParseBlocks(input).Select(Transpose)
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select new Problem(
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cols.First()[^1],
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cols.Select(col => long.Parse(col[..^1]))
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)
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);
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long Solve(IEnumerable<Problem> problems) {
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var res = 0L;
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foreach (var problem in problems) {
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if (problem.op == '+') {
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res += problem.nums.Sum();
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} else {
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res += problem.nums.Aggregate(1L, (a, b) => a * b);
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}
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}
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return res;
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}
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IEnumerable<string[]> ParseBlocks(string input) {
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var lines = input.Split("\n");
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int ccol = lines[0].Length;
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var blockStart = 0;
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for (int icol = 0; icol < ccol; icol++) {
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if (GetColumn(lines, icol).Trim() == "") {
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yield return GetBlock(lines, blockStart, icol);
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blockStart = icol+1;
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}
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}
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yield return GetBlock(lines, blockStart, ccol);
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}
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string[] GetBlock(string[] lines, int icolFrom, int icolTo) => (
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from line in lines
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select line[icolFrom..icolTo]
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).ToArray();
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string[] Transpose(string[] lines) => (
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from icol in Enumerable.Range(0, lines[0].Length)
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select GetColumn(lines, icol)
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).ToArray();
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string GetColumn(string[] lines, int icol) =>
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string.Join("", from line in lines select line[icol]);
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}

‎2025/Day06/input.in‎

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‎2025/Day06/input.refout‎

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4693159084994
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11643736116335

‎2025/SplashScreen.cs‎

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@@ -8,24 +8,24 @@ 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 █ █ █▄█ ▀▄▀ █▄▄ █ █ █▄ █▄█ █ █▄ █▄█ █▄█ █▄▄ λy.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(0x32211a, false, ". ");
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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, "_________ ");
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Write(0x32211a, 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(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(0x32211a, false, "' ' ");
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Write(0x999999, 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, "__");
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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(0x32211a, false, ". . ' . ' ");
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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(0xaa7744, false, "...' ");
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Write(0xcccccc, false, " 5 ");
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Write(0xffff66, false, "**\n ");
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Write(0x9900, false, "|| ");
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Write(0x32211a, false, "'");
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Write(0x666666, false, " ____________ \n ");
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Write(0x999999, false, "_");
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Write(0x9900, false, "||");
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Write(0x999999, false, "__");
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Write(0x666666, false, "/ \\_ ");
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Write(0xcccccc, false, " 6 ");
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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, " 6\n ");
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Write(0x333333, false, "| | \n |___] ");
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Write(0x333333, false, " ");
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Write(0x999999, false, "|");
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Write(0xff00, false, "^");
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Write(0xbb66ff, false, "@ ");
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Write(0x999999, false, "|");
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Write(0x333333, false, " 1 2 3 | \n ");
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Write(0x999999, false, "|");
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Write(0xff0000, false, "&");
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Write(0xffff66, false, "%");
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Write(0xaaaa, false, ";");
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Write(0xaabbcc, false, "]");
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Write(0x333333, false, "__[]_[]_[]__<>| ");
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Write(0x666666, false, " 7\n \n ");
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Write(0x666666, false, " 8\n ");
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Write(0x666666, false, " \n 9\n ");

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