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Implement day 19, in PHP.

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Bert Peters
2017-12-19 10:11:51 +01:00
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2017/README.md
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@@ -24,7 +24,7 @@ The current plan, in no particular order:
- [x] Node.js - [Day 12](./day-12/solution.js)
- [ ] Objective C
- [x] Perl - [Day 05](./day-05/solution.pl)
- [ ] PHP
- [x] PHP - [Day 19](./day-19/solution.php)
- [ ] Prolog
- [ ] Python
- [x] Ruby - [Day 08](./day-08/solution.rb)

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2017/day-19/input.txt Normal file
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| | +-|-------|---------|---------------------------|---|-------|-------------------|---------|-------------------------+ +---|-+ +---|-+ | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+-------|-------|---------|---------------------------------------|---------|-----|-------------------|-+ | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | +-------------------------------------------|-+ +-----+ | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | +-----------------------------+ | +-------+ +-|---+ | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
| +-------|---------|-----------|---------+ +---|---+ | | | | +-------+ | | +-------|---+ | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
+---------------|-------------------------|-------|---|---|---------------------|-|---+ +-----------|A------------------------------|-----------+ | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | |
| | | +-|-----------------------+ | +-----------------|---+ +---------------------------------------+ | | +-+ +-------------------------+ | | | |
| | | | | | | | | | | | | | | | |
+---+ +---+ | | | +-------------------|---------------------------------------------------------------------------+ | | | | | | |
| | | | | | | | | | | | | | | | |
+-----------+ | | | | | | | +-----------------------------------------+ | +-|-------------------------------------------+
| | | | | | | | | | | | | | | | |
+-+ | +---------|-------+ | | +---------------------------------------------------------------+ +-----------------------------------------------------------------+
| | | | | | | | | | |
Q-+ +---------------+ +-----------+ +---------------------------------------------------------------------------------------------------------------+ +-+ +---------------+

33
2017/day-19/solution.php Executable file
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#!/usr/bin/php
<?php
$maze = file('php://stdin');
$x = strpos($maze[0], '|');
$y = 0;
$dir = [0, 1];
$path = '';
$steps = 0;
while ($maze[$y][$x] != ' ') {
if (ctype_alpha($maze[$y][$x])) {
$path .= $maze[$y][$x];
} elseif ($maze[$y][$x] == '+') {
if ($dir[0] == 0) {
$dir[0] = ($x + 1 >= strlen($maze[$y]) || $maze[$y][$x + 1] == ' ') ? -1 : 1;
$dir[1] = 0;
} else {
$dir[0] = 0;
$dir[1] = ($y + 1 >= count($maze) || $maze[$y + 1][$x] == ' ') ? -1 : 1;
}
}
$x += $dir[0];
$y += $dir[1];
$steps++;
}
echo $path . PHP_EOL;
echo $steps . PHP_EOL;