64 lines
1.4 KiB
PHP
64 lines
1.4 KiB
PHP
<?php
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// Problem: https://adventofcode.com/2015/day/1
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/*
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* Solution 1
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*
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* Runtime: ~0.158ms
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*/
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function solution1() {
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$start_time = microtime(true);
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$instructions = file_get_contents('./inputs/day1.txt');
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$up_floors = substr_count($instructions, "(");
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$down_floors = substr_count($instructions, ")");
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$total = $up_floors - $down_floors;
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echo "The answer is $total\n";
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$end_time = microtime(true);
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$execution_time = ($end_time - $start_time);
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echo $execution_time * 1000 . "\n";
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}
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solution1();
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/*
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* Solution 2
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*
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* Runtime: ~0.622ms
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*/
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function solution2() {
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$start_time = microtime(true);
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$instructions = file_get_contents('./inputs/day1.txt');
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$chars = str_split($instructions);
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$floor = 0;
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foreach ($chars as $char) {
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match ($char) {
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"(" => $floor++,
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")" => $floor--,
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default => 0,
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};
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}
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echo "The answer is $floor\n";
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$end_time = microtime(true);
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$execution_time = ($end_time - $start_time);
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echo $execution_time * 1000 . "\n";
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}
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solution2();
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/*
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* Solution 3
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*
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* Runtime: ~0
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*/
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function solution3() {
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$start_time = microtime(true);
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$instructions = file_get_contents('./inputs/day1.txt');
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$chars = str_split($instructions);
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$values = array_count_values($chars);
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$floor = $values['('] - $values[')'];
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echo "The answer is $floor\n";
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$end_time = microtime(true);
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$execution_time = ($end_time - $start_time);
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echo $execution_time * 1000 . "\n";
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}
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solution3();
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