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Advent of Code 2023 - day 2
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<?php | |
declare(strict_types=1); | |
$input = file('input.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); | |
$maxRed = 12; | |
$maxGreen = 13; | |
$maxBlue = 14; | |
$validCount = 0; | |
$sumOfGameIds = 0; | |
$sumOfGamePowers = 0; | |
foreach ($input as $line) { | |
$gameInfo = getGameInfo($line); | |
/*if (isGamePossible($gameInfo, $maxRed, $maxGreen, $maxBlue)) { | |
$sumOfGameIds += key($gameInfo); | |
$validCount++; | |
}*/ | |
$gamePower = getGamePower($gameInfo); | |
$sumOfGamePowers += $gamePower; | |
} | |
/*printf('Processed %d games, but only %d were possible with given restrictions, and the sum of game ids was %d.' . PHP_EOL, | |
count($input), | |
$validCount, | |
$sumOfGameIds | |
);*/ | |
printf('Processed %d games, by their powers combined we got %s' . PHP_EOL, count($input), $sumOfGamePowers); | |
function getGamePower(array $gameInfo): int | |
{ | |
$gamePower = 1; | |
$highestGreen = 0; | |
$highestBlue = 0; | |
$highestRed = 0; | |
foreach ($gameInfo as $id => $games) { | |
foreach ($games as $game) { | |
$highestGreen = max($highestGreen, $game['green'] ?? 0); | |
$highestBlue = max($highestBlue, $game['blue'] ?? 0); | |
$highestRed = max($highestRed, $game['red'] ?? 0); | |
} | |
} | |
return $highestRed * $highestBlue * $highestGreen; | |
} | |
function getGameInfo(string $line): array | |
{ | |
$gameInfo = []; | |
$gameId = intval(str_replace('Game ', '', $line)); | |
$games = explode(';', substr($line, strpos($line, ':') + 1)); | |
foreach ($games as $game) { | |
$grabs = explode(',', $game); | |
$singleGameInfo = []; | |
foreach ($grabs as $grab) { | |
$numAndColour = explode(' ', trim($grab)); | |
$singleGameInfo[$numAndColour[1]] = $numAndColour[0]; | |
} | |
$gameInfo[$gameId][] = $singleGameInfo; | |
} | |
return $gameInfo; | |
} | |
function isGamePossible(array $gamesInfo, int $maxRed, int $maxGreen, int $maxBlue): bool | |
{ | |
foreach ($gamesInfo as $id => $games) { | |
foreach ($games as $game) { | |
if (($game['green'] ?? 0) > $maxGreen || | |
($game['red'] ?? 0) > $maxRed || | |
($game['blue'] ?? 0) > $maxBlue | |
) { | |
return false; | |
} | |
} | |
} | |
return true; | |
} | |
function dd($a, $b = null, $c = null, $d = null) { | |
die(var_dump($a, $b, $c, $d)); | |
} |
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