Day4

FailedCode · FailedCode · commit 7bad8750dd40 · 2022-12-09T20:44:18.000+01:00
diff --git a/src/Days/Day4.php b/src/Days/Day4.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Failedcode\Aoc2022\Days;
+
+class Day4 extends AbstractDay
+{
+    public function solve_part_1(): string
+    {
+        $ranges = $this->getInputRanges();
+        $containSum = 0;
+        foreach ($ranges as $range) {
+            list($r1s, $r1e, $r2s, $r2e) = $range;
+            if (($r2s >= $r1s && $r2e <= $r1e) || ($r1s >= $r2s && $r1e <= $r2e)) {
+                $containSum += 1;
+            }
+        }
+        return $containSum;
+    }
+
+    public function solve_part_2(): string
+    {
+        $ranges = $this->getInputRanges();
+        $containSum = 0;
+        foreach ($ranges as $range) {
+            list($r1s, $r1e, $r2s, $r2e) = $range;
+            if ($this->isInRange($r1s, $r2s, $r2e) ||
+                $this->isInRange($r1e, $r2s, $r2e) ||
+                $this->isInRange($r2s, $r1s, $r1e) ||
+                $this->isInRange($r2e, $r1s, $r1e)) {
+                $containSum += 1;
+            }
+        }
+        return $containSum;
+    }
+
+    protected function isInRange($x, $start, $end)
+    {
+        return $x >= $start && $x <= $end;
+    }
+
+    protected function getInputRanges()
+    {
+        $inputList = $this->util->loadInput(4);
+        $ranges = [];
+        foreach ($inputList as $row) {
+            if (preg_match('~(\d+)-(\d+),(\d+)-(\d+)~', $row, $matches)) {
+                $ranges[] = array_slice($matches, 1);
+            }
+        }
+        return $ranges;
+    }
+}
