15th day and 16th day WIP :(

15/part2.php

@@ -0,0 +1,55 @@
+<?php
+$input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+$input = array_map('str_split', $input);
+$newInput = [];
+for ($i = 0; $i < 5; $i++) {
+    for ($j = 0; $j < 5; $j++) {
+        foreach ($input as $row => $line) {
+            foreach ($line as $column => $number) {
+//                echo ($row + 1) * $i . '-' . ($column + 1) * $j . ' ';
+                $newNumber = ($number + $i + $j);
+                if ($newNumber > 9) {
+                    $newNumber++;
+                }
+
+                $newInput[count($input) * $i + $row][count($input[0]) * $j + $column] = $newNumber%10;
+            }
+
+        }
+//        echo "\n";
+    }
+}
+$input = $newInput;
+//foreach ($newInput as $line) {
+//    foreach ($line as $number) {
+//        echo $number . '';
+//    }
+////    die();
+//    echo "\n";
+//}
+//die();
+
+$visited = array_fill(0, count($input), array_fill(0, count($input[0]), PHP_INT_MAX));
+
+$queue = [[0, 0]];
+$visited[0][0] = 0;
+
+while (count($queue) > 0) {
+    [$x, $y] = array_shift($queue);
+    //down
+    if (isset($input[$x + 1][$y]) &&
+        $visited[$x + 1][$y] > $visited[$x][$y] + $input[$x + 1][$y]
+    ) {
+        $queue[] = [$x + 1, $y];
+        $visited[$x + 1][$y] = $visited[$x][$y] + $input[$x + 1][$y];
+    }
+    //right
+    if (isset($input[$x][$y + 1]) &&
+        $visited[$x][$y + 1] > $visited[$x][$y] + $input[$x][$y + 1]
+    ) {
+        $queue[] = [$x, $y + 1];
+        $visited[$x][$y + 1] = $visited[$x][$y] + $input[$x][$y + 1];
+    }
+}
+
+echo $visited[count($visited) - 1][count($visited[0]) - 1]; //553