From 625de67c40b3680b1d8309cdfe45773b4b3abea0 Mon Sep 17 00:00:00 2001
From: sprak <sprak3000+github@gmail.com>
Date: Mon, 2 Dec 2024 21:14:48 -0500
Subject: [PATCH 1/2] 2024 Day 01 part 1

---
 2024/day-02.php                        |   89 +++
 2024/inputs/day-02-sample.input        |    6 +
 2024/inputs/day-02.input               | 1000 ++++++++++++++++++++++++
 2024/src/ReactorReportParser.php       |   80 ++
 2024/tests/ReactorReportParserTest.php |   45 ++
 README.md                              |    2 +-
 6 files changed, 1221 insertions(+), 1 deletion(-)
 create mode 100644 2024/day-02.php
 create mode 100644 2024/inputs/day-02-sample.input
 create mode 100644 2024/inputs/day-02.input
 create mode 100644 2024/src/ReactorReportParser.php
 create mode 100644 2024/tests/ReactorReportParserTest.php

diff --git a/2024/day-02.php b/2024/day-02.php
new file mode 100644
index 0000000..36fa5eb
--- /dev/null
+++ b/2024/day-02.php
@@ -0,0 +1,89 @@
+<?php
+
+require __DIR__ . '/../vendor/autoload.php';
+
+use adventofcode\Year2024\ReactorReportParser;
+
+/**
+ * --- 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?
+ */
+
+$reactorReportParser = new ReactorReportParser();
+
+$reports = file(__DIR__ . '/inputs/day-02.input', FILE_IGNORE_NEW_LINES);
+
+$count = $reactorReportParser->findSafeReportsCount($reports);
+print('There are ' . $count . " safe reports.\n");
+
+/**
+ * --- Part Two ---
+ *
+ * The engineers are surprised by the low number of safe reports until they realize they forgot to tell you about
+ * the Problem Dampener.
+ *
+ * The Problem Dampener is a reactor-mounted module that lets the reactor safety systems tolerate a single bad level
+ * in what would otherwise be a safe report. It's like the bad level never happened!
+ *
+ * Now, the same rules apply as before, except if removing a single level from an unsafe report would make it safe,
+ * the report instead counts as safe.
+ *
+ * More of the above example's reports are now safe:
+ *
+ *   - 7 6 4 2 1: Safe without removing any level.
+ *   - 1 2 7 8 9: Unsafe regardless of which level is removed.
+ *   - 9 7 6 2 1: Unsafe regardless of which level is removed.
+ *   - 1 3 2 4 5: Safe by removing the second level, 3.
+ *   - 8 6 4 4 1: Safe by removing the third level, 4.
+ *   - 1 3 6 7 9: Safe without removing any level.
+ *
+ * Thanks to the Problem Dampener, 4 reports are actually safe!
+ *
+ * Update your analysis by handling situations where the Problem Dampener can remove a single level from unsafe reports.
+ * How many reports are now safe?
+ */
+
+//$count = $reactorReportParser->findSafeReportsCount($reports, true);
+//print('There are ' . $count . " safe reports after applying the Problem Dampener.\n");
diff --git a/2024/inputs/day-02-sample.input b/2024/inputs/day-02-sample.input
new file mode 100644
index 0000000..b49c10d
--- /dev/null
+++ b/2024/inputs/day-02-sample.input
@@ -0,0 +1,6 @@
+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
diff --git a/2024/inputs/day-02.input b/2024/inputs/day-02.input
new file mode 100644
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--- /dev/null
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diff --git a/2024/src/ReactorReportParser.php b/2024/src/ReactorReportParser.php
new file mode 100644
index 0000000..1e26e92
--- /dev/null
+++ b/2024/src/ReactorReportParser.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace adventofcode\Year2024;
+
+class ReactorReportParser
+{
+    protected int $safeReportsCount = 0;
+
+    /**
+     * Finds the total number of the safe reports.
+     *
+     * @param array $reports
+     * @param bool $applyProblemDampener Apply problem dampener to remove a single problem level; defaults to false
+     * @return int
+     */
+    public function findSafeReportsCount(array $reports, bool $applyProblemDampener = false): int
+    {
+        $this->safeReportsCount = 0;
+
+        foreach ($reports as $report) {
+            $levels = explode(' ', $report);
+
+            $previousChange = '';
+            $isSafeChange = true;
+            $dampenerUsed = false;
+
+            for ($i = 1; $i < count($levels); $i++) {
+                $previousLevel = $levels[$i - 1];
+                $currentLevel = $levels[$i];
+                $currentChange = $previousLevel < $currentLevel ? 'increase' : 'decrease';
+
+                $isSafeChange = $this->isSafeChange($previousLevel, $currentLevel, $previousChange, $currentChange);
+
+                if (!$isSafeChange) {
+                    break;
+                }
+
+                $previousChange = $currentChange;
+            }
+
+            if ($isSafeChange) {
+                $this->safeReportsCount++;
+            }
+        }
+
+        return $this->safeReportsCount;
+    }
+
+    /**
+     * @param int $previousLevel
+     * @param int $currentLevel
+     * @param string $previousChange
+     * @param string $currentChange
+     * @return bool
+     */
+    private function isSafeChange(
+        int $previousLevel,
+        int $currentLevel,
+        string $previousChange,
+        string $currentChange
+    ): bool {
+        if ($previousLevel === $currentLevel) {
+            return false;
+        }
+
+        $diff = abs($currentLevel - $previousLevel);
+        if ($diff > 3) {
+            return false;
+        }
+
+        if (
+            ($currentChange === 'increase' && $previousChange === 'decrease') ||
+            ($currentChange === 'decrease' && $previousChange === 'increase')
+        ) {
+            return false;
+        }
+
+        return true;
+    }
+}
diff --git a/2024/tests/ReactorReportParserTest.php b/2024/tests/ReactorReportParserTest.php
new file mode 100644
index 0000000..53838f1
--- /dev/null
+++ b/2024/tests/ReactorReportParserTest.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace adventofcode\Year2024\Test;
+
+use adventofcode\Year2024\ReactorReportParser;
+use PHPUnit\Framework\TestCase;
+
+class ReactorReportParserTest extends TestCase
+{
+    protected ReactorReportParser $reactorReportParser;
+    protected array|false $sampleReports;
+    protected array|false $reports;
+
+    protected function setup(): void
+    {
+        $this->reactorReportParser = new ReactorReportParser();
+        $this->sampleReports = file(__DIR__ . '/../inputs/day-02-sample.input', FILE_IGNORE_NEW_LINES);
+        $this->reports = file(__DIR__ . '/../inputs/day-02.input', FILE_IGNORE_NEW_LINES);
+    }
+
+    public function testFindSafeReportsCount()
+    {
+        // Day 2 Part 1 example inputs
+        $result = $this->reactorReportParser->findSafeReportsCount($this->sampleReports);
+        $this->assertEquals(2, $result);
+
+        // Day 2 Part 1 puzzle inputs
+        $result = $this->reactorReportParser->findSafeReportsCount($this->reports);
+        $this->assertEquals(660, $result);
+    }
+
+    public function testFindSafeReportsCountUsingProblemDampener()
+    {
+        $this->markTestSkipped('TODO...');
+
+        // Day 2 Part 2 example inputs
+        $result = $this->reactorReportParser->findSafeReportsCount($this->sampleReports, true);
+        $this->assertEquals(4, $result);
+
+        // Day 2 Part 2 puzzle inputs
+        // 685 is too low
+        $result = $this->reactorReportParser->findSafeReportsCount($this->reports, true);
+        $this->assertEquals(660, $result);
+    }
+}
diff --git a/README.md b/README.md
index 16c8bc4..8255c2a 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ of changes and trends in that community.
 |        | 2024          |     2023      |     2022      |     2021      |     2020      |     2019      |     2018      |     2017      | 2016 |     2015      |
 |-------:|---------------|:-------------:|:-------------:|:-------------:|:-------------:|:-------------:|:-------------:|:-------------:|:----:|:-------------:|
 | Day 01 | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: |      | :star: :star: |
-| Day 02 |               | :star: :star: | :star: :star: | :star: :star: | :star: :star: |    :star:     | :star: :star: | :star: :star: |      | :star: :star: |
+| Day 02 | :star:        | :star: :star: | :star: :star: | :star: :star: | :star: :star: |    :star:     | :star: :star: | :star: :star: |      | :star: :star: |
 | Day 03 |               |               | :star: :star: | :star: :star: | :star: :star: |               | :star: :star: |               |      | :star: :star: |
 | Day 04 |               |               | :star: :star: |               | :star: :star: |               | :star: :star: | :star: :star: |      | :star: :star: |
 | Day 05 |               |               | :star: :star: |               | :star: :star: |               |               | :star: :star: |      | :star: :star: |

From 27d3257b49ddccaefdd647b0a8db57fa621ab513 Mon Sep 17 00:00:00 2001
From: sprak <sprak3000+github@gmail.com>
Date: Tue, 3 Dec 2024 16:08:08 -0500
Subject: [PATCH 2/2] 2024 Day 02 part 2

---
 2024/day-02.php                        |  4 +--
 2024/src/ReactorReportParser.php       | 50 ++++++++++++++++++--------
 2024/tests/ReactorReportParserTest.php |  5 +--
 README.md                              |  2 +-
 4 files changed, 39 insertions(+), 22 deletions(-)

diff --git a/2024/day-02.php b/2024/day-02.php
index 36fa5eb..4b4f8aa 100644
--- a/2024/day-02.php
+++ b/2024/day-02.php
@@ -85,5 +85,5 @@
  * How many reports are now safe?
  */
 
-//$count = $reactorReportParser->findSafeReportsCount($reports, true);
-//print('There are ' . $count . " safe reports after applying the Problem Dampener.\n");
+$count = $reactorReportParser->findSafeReportsCount($reports, true);
+print('There are ' . $count . " safe reports after applying the Problem Dampener.\n");
diff --git a/2024/src/ReactorReportParser.php b/2024/src/ReactorReportParser.php
index 1e26e92..5359625 100644
--- a/2024/src/ReactorReportParser.php
+++ b/2024/src/ReactorReportParser.php
@@ -20,30 +20,50 @@ public function findSafeReportsCount(array $reports, bool $applyProblemDampener
         foreach ($reports as $report) {
             $levels = explode(' ', $report);
 
-            $previousChange = '';
-            $isSafeChange = true;
-            $dampenerUsed = false;
+            if ($this->isSafeReport($levels, $applyProblemDampener)) {
+                $this->safeReportsCount++;
+            }
+        }
 
-            for ($i = 1; $i < count($levels); $i++) {
-                $previousLevel = $levels[$i - 1];
-                $currentLevel = $levels[$i];
-                $currentChange = $previousLevel < $currentLevel ? 'increase' : 'decrease';
+        return $this->safeReportsCount;
+    }
 
-                $isSafeChange = $this->isSafeChange($previousLevel, $currentLevel, $previousChange, $currentChange);
+    /**
+     * @param array $levels
+     * @param bool $applyProblemDampener
+     * @return bool
+     */
+    private function isSafeReport(array $levels, bool $applyProblemDampener = false): bool
+    {
+        $previousChange = '';
 
-                if (!$isSafeChange) {
-                    break;
-                }
+        for ($i = 1; $i < count($levels); $i++) {
+            $previousLevel = $levels[$i - 1];
+            $currentLevel = $levels[$i];
+            $currentChange = $previousLevel < $currentLevel ? 'increase' : 'decrease';
+
+            $isSafeChange = $this->isSafeChange($previousLevel, $currentLevel, $previousChange, $currentChange);
 
-                $previousChange = $currentChange;
+            if (!$isSafeChange && !$applyProblemDampener) {
+                return false;
             }
 
-            if ($isSafeChange) {
-                $this->safeReportsCount++;
+            if (!$isSafeChange && $applyProblemDampener) {
+                for ($j = 0; $j < count($levels); $j++) {
+                    $levelsWithoutOneLevel = $levels;
+                    array_splice($levelsWithoutOneLevel, $j, 1, []);
+                    if ($this->isSafeReport($levelsWithoutOneLevel)) {
+                        return true;
+                    }
+                }
+
+                return false;
             }
+
+            $previousChange = $currentChange;
         }
 
-        return $this->safeReportsCount;
+        return true;
     }
 
     /**
diff --git a/2024/tests/ReactorReportParserTest.php b/2024/tests/ReactorReportParserTest.php
index 53838f1..b247da6 100644
--- a/2024/tests/ReactorReportParserTest.php
+++ b/2024/tests/ReactorReportParserTest.php
@@ -31,15 +31,12 @@ public function testFindSafeReportsCount()
 
     public function testFindSafeReportsCountUsingProblemDampener()
     {
-        $this->markTestSkipped('TODO...');
-
         // Day 2 Part 2 example inputs
         $result = $this->reactorReportParser->findSafeReportsCount($this->sampleReports, true);
         $this->assertEquals(4, $result);
 
         // Day 2 Part 2 puzzle inputs
-        // 685 is too low
         $result = $this->reactorReportParser->findSafeReportsCount($this->reports, true);
-        $this->assertEquals(660, $result);
+        $this->assertEquals(689, $result);
     }
 }
diff --git a/README.md b/README.md
index 8255c2a..a776cfb 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ of changes and trends in that community.
 |        | 2024          |     2023      |     2022      |     2021      |     2020      |     2019      |     2018      |     2017      | 2016 |     2015      |
 |-------:|---------------|:-------------:|:-------------:|:-------------:|:-------------:|:-------------:|:-------------:|:-------------:|:----:|:-------------:|
 | Day 01 | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: |      | :star: :star: |
-| Day 02 | :star:        | :star: :star: | :star: :star: | :star: :star: | :star: :star: |    :star:     | :star: :star: | :star: :star: |      | :star: :star: |
+| Day 02 | :star: :star: | :star: :star: | :star: :star: | :star: :star: | :star: :star: |    :star:     | :star: :star: | :star: :star: |      | :star: :star: |
 | Day 03 |               |               | :star: :star: | :star: :star: | :star: :star: |               | :star: :star: |               |      | :star: :star: |
 | Day 04 |               |               | :star: :star: |               | :star: :star: |               | :star: :star: | :star: :star: |      | :star: :star: |
 | Day 05 |               |               | :star: :star: |               | :star: :star: |               |               | :star: :star: |      | :star: :star: |