From a5173f623ded0f9db80b5d92880b6f3191158550 Mon Sep 17 00:00:00 2001 From: "Valeriano A.R." Date: Mon, 2 Dec 2024 08:21:07 +0100 Subject: [PATCH] AdventOfCode2024 Day02 --- AdventOfCode2024.Tests/Day02_Tests.cs | 38 + AdventOfCode2024/Day02.cs | 125 ++++ AdventOfCode2024/inputs/Day02.txt | 1000 +++++++++++++++++++++++++ 3 files changed, 1163 insertions(+) create mode 100644 AdventOfCode2024.Tests/Day02_Tests.cs create mode 100644 AdventOfCode2024/Day02.cs create mode 100644 AdventOfCode2024/inputs/Day02.txt diff --git a/AdventOfCode2024.Tests/Day02_Tests.cs b/AdventOfCode2024.Tests/Day02_Tests.cs new file mode 100644 index 0000000..865b999 --- /dev/null +++ b/AdventOfCode2024.Tests/Day02_Tests.cs @@ -0,0 +1,38 @@ +namespace AdventOfCode2024.Tests; + +public class Day02_Tests +{ + [Fact] + public void ResolvePart1__Example() + { + Day02 day = new(); + + string result = day.ResolvePart1([ + "7 6 4 2 1", + "1 2 7 8 9", + "9 7 6 2 1", + "1 3 2 4 5", + "8 6 4 4 1", + "1 3 6 7 9", + ]); + + Assert.Equal("2", result); + } + + [Fact] + public void ResolvePart2__Example() + { + Day02 day = new(); + + string result = day.ResolvePart2([ + "7 6 4 2 1", + "1 2 7 8 9", + "9 7 6 2 1", + "1 3 2 4 5", + "8 6 4 4 1", + "1 3 6 7 9", + ]); + + Assert.Equal("4", result); + } +} \ No newline at end of file diff --git a/AdventOfCode2024/Day02.cs b/AdventOfCode2024/Day02.cs new file mode 100644 index 0000000..5913f53 --- /dev/null +++ b/AdventOfCode2024/Day02.cs @@ -0,0 +1,125 @@ +namespace AdventOfCode2024; + +/* +--- Day 2: Red-Nosed Reports --- + +Fortunately, the first location The Historians want to search isn't a long walk from the Chief Historian's office. + +While the Red-Nosed Reindeer nuclear fusion/fission plant appears to contain no sign of the Chief Historian, the engineers there run up to you as soon as they see you. Apparently, they still talk about the time Rudolph was saved through molecular synthesis from a single electron. + +They're quick to add that - since you're already here - they'd really appreciate your help analyzing some unusual data from the Red-Nosed reactor. You turn to check if The Historians are waiting for you, but they seem to have already divided into groups that are currently searching every corner of the facility. You offer to help with the unusual data. + +The unusual data (your puzzle input) consists of many reports, one report per line. Each report is a list of numbers called levels that are separated by spaces. For example: + +7 6 4 2 1 +1 2 7 8 9 +9 7 6 2 1 +1 3 2 4 5 +8 6 4 4 1 +1 3 6 7 9 + +This example data contains six reports each containing five levels. + +The engineers are trying to figure out which reports are safe. The Red-Nosed reactor safety systems can only tolerate levels that are either gradually increasing or gradually decreasing. So, a report only counts as safe if both of the following are true: + + The levels are either all increasing or all decreasing. + Any two adjacent levels differ by at least one and at most three. + +In the example above, the reports can be found safe or unsafe by checking those rules: + + 7 6 4 2 1: Safe because the levels are all decreasing by 1 or 2. + 1 2 7 8 9: Unsafe because 2 7 is an increase of 5. + 9 7 6 2 1: Unsafe because 6 2 is a decrease of 4. + 1 3 2 4 5: Unsafe because 1 3 is increasing but 3 2 is decreasing. + 8 6 4 4 1: Unsafe because 4 4 is neither an increase or a decrease. + 1 3 6 7 9: Safe because the levels are all increasing by 1, 2, or 3. + +So, in this example, 2 reports are safe. + +Analyze the unusual data from the engineers. How many reports are safe? + +--- Part Two --- + +The engineers are surprised by the low number of safe reports until they realize they forgot to tell you about the Problem Dampener. + +The Problem Dampener is a reactor-mounted module that lets the reactor safety systems tolerate a single bad level in what would otherwise be a safe report. It's like the bad level never happened! + +Now, the same rules apply as before, except if removing a single level from an unsafe report would make it safe, the report instead counts as safe. + +More of the above example's reports are now safe: + + 7 6 4 2 1: Safe without removing any level. + 1 2 7 8 9: Unsafe regardless of which level is removed. + 9 7 6 2 1: Unsafe regardless of which level is removed. + 1 3 2 4 5: Safe by removing the second level, 3. + 8 6 4 4 1: Safe by removing the third level, 4. + 1 3 6 7 9: Safe without removing any level. + +Thanks to the Problem Dampener, 4 reports are actually safe! + +Update your analysis by handling situations where the Problem Dampener can remove a single level from unsafe reports. How many reports are now safe? + + +*/ + +public class Day02 : IDay +{ + public string ResolvePart1(string[] inputs) + { + int countSafe = 0; + foreach (string input in inputs) + { + List numbers = input.Split(" ").Select(int.Parse).ToList(); + if (SearchProblem(numbers) == -1) { countSafe++; } + } + return countSafe.ToString(); + } + + private int SearchProblem(List numbers) + { + int? previousSign = null; + for (int i = 1; i < numbers.Count; i++) + { + int delta = numbers[i] - numbers[i - 1]; + if (delta == 0 || delta > 3 || delta < -3) { return i; } + if (previousSign != null) + { + if (previousSign > 0 && delta < 0) { return i; } + if (previousSign < 0 && delta > 0) { return i; } + } + previousSign = delta; + } + return -1; + } + + public string ResolvePart2(string[] inputs) + { + int countSafe = 0; + foreach (string input in inputs) + { + List numbers = input.Split(" ").Select(int.Parse).ToList(); + int problemIdx = SearchProblem(numbers); + if (problemIdx == -1) + { + countSafe++; + continue; + } + + List numbersAlt0 = [..numbers]; + numbersAlt0.RemoveAt(problemIdx - 1); + if (SearchProblem(numbersAlt0) == -1) + { + countSafe++; + continue; + } + + List numbersAlt1 = [..numbers]; + numbersAlt1.RemoveAt(problemIdx); + if (SearchProblem(numbersAlt1) == -1) + { + countSafe++; + } + } + return countSafe.ToString(); + } +} \ No newline at end of file diff --git a/AdventOfCode2024/inputs/Day02.txt b/AdventOfCode2024/inputs/Day02.txt new file mode 100644 index 0000000..4d485d2 --- /dev/null +++ b/AdventOfCode2024/inputs/Day02.txt @@ -0,0 +1,1000 @@ +22 25 27 28 30 31 32 29 +72 74 75 77 80 81 81 +52 53 55 58 59 63 +14 17 19 22 27 +65 68 67 68 71 73 76 77 +53 56 53 55 54 +60 62 59 62 62 +27 30 28 31 32 35 39 +64 67 68 71 74 71 74 81 +29 32 32 33 36 39 40 +72 74 74 75 74 +11 14 14 17 17 +64 65 67 70 72 72 76 +77 79 80 80 82 89 +45 47 49 53 54 +13 16 18 22 23 25 27 24 +16 17 18 19 20 21 25 25 +25 26 30 32 34 35 36 40 +45 48 52 54 56 62 +51 52 54 56 59 64 66 68 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