hsegnitz
diff --git a/‎php/2023/05/01.php
Lines changed: 77 additions & 0 deletions b/‎php/2023/05/01.php
Lines changed: 77 additions & 0 deletions
diff --git a/‎php/2023/05/example.txt
361 Bytes b/‎php/2023/05/example.txt
361 Bytes
diff --git a/‎php/2023/05/input.txt
7.72 KB b/‎php/2023/05/input.txt
7.72 KB
@@ -0,0 +1,77 @@
+<?php
+
+namespace Year2023\Day05;
+
+#$input = file_get_contents('example.txt');
+$input = file_get_contents('input.txt');
+
+class Map
+{
+    /** @var Range[] */
+    private array $ranges = [];
+    public function __construct(string $input)
+    {
+        $lines = explode("\n", $input);
+        array_shift($lines);
+        foreach ($lines as $line) {
+            $this->ranges[] = new Range($line);
+        }
+    }
+
+    public function convert(int $in): int
+    {
+        foreach ($this->ranges as $range) {
+            if (null !== ($result = $range->convert($in))) {
+                return $result;
+            }
+        }
+        return $in;
+    }
+}
+
+class Range
+{
+    private int $destination;
+    private int $source;
+    private int $length;
+    public function __construct(string $input)
+    {
+        [$this->destination, $this->source, $this->length] = explode(" ", $input);
+    }
+
+    public function convert(int $in): ?int
+    {
+        if ($in >= $this->source && $in <= $this->source + $this->length) {
+            return $in - ($this->source - $this->destination);
+        }
+        return null;
+    }
+}
+
+
+
+$blocks = explode("\n\n", $input);
+$seeds = explode(" ", array_shift($blocks));
+array_shift($seeds);
+
+$maps = [];
+foreach ($blocks as $block) {
+    $maps[] = new Map($block);
+}
+
+$locations = [];
+foreach ($seeds as $seed) {
+    $location = $seed;
+    foreach ($maps as $map) {
+        $location = $map->convert($location);
+    }
+
+    $locations[] = $location;
+    echo $seed, " -> ", $location, "\n";
+}
+
+echo "lowest: ", min($locations);
+
+echo "\n";
+
+