<?php
$input = \file_get_contents("inputs/11.txt");
function isValidPassword($password)
{
if (\strpos($password, "i") !== false || \strpos($password, "o") !== false || \strpos($password, "l") !== false || !\preg_match("/([a-z])\\1[a-z]*([a-z])\\2/", $password)) {
return false;
}
for ($i = 0; $i < \strlen($password) - 2; $i++) {
$a = $password[$i];
$b = $password[$i + 1];
$c = $password[$i + 2];
// We could do this with ord() and less variables, but PHP is neat, isnt it? :)
if (++$a === $b && ++$a === $c) {
return true;
}
}
return false;
}
function getNextPassword($password)
{
while (!\isValidPassword(++$password)) {
}
return $password;
}
$nextPassword = \getNextPassword($input);
$nextNextPassword = \getNextPassword($nextPassword);
echo "The next password is `{$nextPassword}`, and after that its `{$nextNextPassword}`.";
// Check for forbidden characters
if (preg_match('/[iol]/', $password)) {
continue;
}
$sequence = false;
$pairs = ['count' => 0, 'chars' => []];
for ($i = 1, $j = strlen($password); $i < $j; $i++) {
if (!in_array($password[$i], $pairs['chars']) && $password[$i] === $password[$i - 1]) {
// Matching pair
$pairs['count']++;
$pairs['chars'][] = $password[$i];
}
if ($sequence === false && $i > 2) {
$ordChar = ord($password[$i]);
if (ord($password[$i - 2]) + 2 === $ordChar && ord($password[$i - 1]) + 1 === $ordChar) {
$sequence = true;
}
}
}
// Found a password match?
if (!$sequence || 2 !== $pairs['count']) {
continue;
}
break;
}
return $password;
}
$input = 'cqjxjnds';
$newPassword = getNextPassword($input);
echo 'New password is: ' . getNextPassword($newPassword) . PHP_EOL;
$password++;
// Check for forbidden characters
if (preg_match('/[iol]/', $password)) {
continue;
}
$sequence = false;
$pairs = ['count' => 0, 'chars' => []];
for ($i = 1, $j = strlen($password); $i < $j; $i++) {
if (!in_array($password[$i], $pairs['chars']) && $password[$i] === $password[$i - 1]) {
// Matching pair
$pairs['count']++;
$pairs['chars'][] = $password[$i];
}
if ($sequence === false && $i > 2) {
$ordChar = ord($password[$i]);
if (ord($password[$i - 2]) + 2 === $ordChar && ord($password[$i - 1]) + 1 === $ordChar) {
$sequence = true;
}
}
}
// Found a password match?
if (!$sequence || 2 !== $pairs['count']) {
continue;
}
break;
}
return $password;
}
$input = 'cqjxjnds';
echo 'New password is: ' . getNextPassword($input) . PHP_EOL;
