function nextValidPass($pass)
{
do {
$pass = nextPass($pass);
} while (!isValid($pass));
return $pass;
}
<?php
$input = file_get_contents('day11.txt');
$ans1 = nextPass($input);
printf('ans#11.1: %s' . PHP_EOL, $ans1);
$ans2 = nextPass($ans1);
printf('ans#11.2: %s' . PHP_EOL, $ans2);
function nextPass($input)
{
while (true) {
$input++;
$chars = str_split($input);
if (array_intersect(['i', 'o', 'l'], $chars)) {
continue;
}
$seq = false;
$pairs = 0;
$skip = 0;
for ($j = 1; $j < count($chars); $j++) {
if ($skip !== $j && $chars[$j] === $chars[$j - 1]) {
$pairs++;
$skip = $j + 1;
}
if (!$seq && $j >= 2) {
$one = $chars[$j - 2];
$two = $chars[$j - 1];
$three = $chars[$j];
if (ord($one) + 2 === ord($three) && ord($two) + 1 === ord($three)) {
$seq = true;
}
}
$len = count($chars) - 2;
for ($i = 0; $i < $len; $i++) {
if (ord($chars[$i]) == ord($chars[$i + 1]) - 1 && ord($chars[$i]) == ord($chars[$i + 2]) - 2) {
return true;
}
}
return false;
}
function hasPairs($chars)
{
$len = count($chars);
for ($i = 0; $i < $len - 3; $i++) {
if ($chars[$i] == $chars[$i + 1]) {
for ($j = $i + 2; $j < $len; $j++) {
if ($chars[$i] != $chars[$j] && $chars[$j] == $chars[$j + 1]) {
return true;
}
}
}
}
return false;
}
$pass = '******';
//part1
$pass = '******';
//part2
do {
$pass = nextPass($pass);
//print ("${pass}\n");
} while (!isValid($pass));
print "{$pass}\n";
