Day 03
unknown
php
5 months ago
1.2 kB
32
Indexable
<body style="margin-left: 10px; font-family: consolas; font-size: 18px"> <?php $day = 3; $file = "advent$day.txt"; echo "-- Start processing $file --<br><br>"; $input = file_get_contents($file); // $inputArray = explode("\r\n", $input); $count = 0; $donts = explode("don't()", $input); $dos = array(); // start instructions as do() array_push($dos, $donts[0]); $dontsCount = count($donts); // first dont is [1] // get substring of donts[1-n] after "do()" if it exists. for ($i = 1; $i < $dontsCount; $i ++) { $do = strstr($donts[$i], "do()"); if ($do != false) array_push($dos, $do); } foreach ($dos as $line) { $mulPattern = "/mul\(\d{1,3},\d{1,3}\)/"; preg_match_all($mulPattern, $line, $mulResults); for ($i = 0; $i < count($mulResults[0]); $i ++) { $mulResult = $mulResults[0][$i]; echo "Matched text = $mulResult<br>"; $numPattern = "/\d{1,3}/"; preg_match_all($numPattern, $mulResult, $nums); $num1 = $nums[0][0]; $num2 = $nums[0][1]; $prod = $num1 * $num2; $count = $count + $prod; } } echo "<br>Sum: $count"; echo "<br><br>-- Finished processing $file --<br>";
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