<?php
/**
* Riddle: Bit Play #1
* -------------------
* This riddle may move, add, remove, compair, and evaluate bit values. It is
* suggested that you brush up on your binary and bitwise operators before
* starting.
*/
$answer = 1; // put your answer here and run to check if you are right
// The Setup
function luhn($number) {
settype($number, 'string');
$sumTable = array(
array(0,1,2,3,4,5,6,7,8,9),
array(0,2,4,6,8,1,3,5,7,9));
$sum = 0;
$flip = 0;
for ($i = strlen($number) - 1; $i >= 0; $i--) {
$sum += $sumTable[$flip++ & 0x1][$number[$i]];
}
return $sum % 10 === 0;
}
settype($answer, 'integer');
$s = (string) $a = &$answer;
$ns = (string) $n = (isset($s[1])) ? ($a >> 1)+$s[1] : ($a >> 1)+$s[0];
$f = ((int) $ns[0] ^ (int) $s[1]);
// The Riddle
function riddle($a, $n, $s, $f, $ns) {
if (
($a != 0 && luhn($a)) &&
(!$f) &&
(($n | $a) == 63) &&
(!isset($s[2]))
) {
return TRUE;
}
return FALSE;
}
// The Result
if (riddle($a, $n, $s, $f, $ns)) {
echo "You got the correct answer! ($a)";
} else {
echo "Sorry, wrong answer. ($a)";
}
- Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- Warning: Uninitialized string offset 1 in /in/c9Snn on line 29
Sorry, wrong answer. (1)
- Output for 5.2.10 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
- Notice: Uninitialized string offset: 1 in /in/c9Snn on line 29
Sorry, wrong answer. (1)
- Output for 7.3.32 - 7.3.33
- Sorry, wrong answer. (1)
- Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.9
- Notice: Uninitialized string offset: 1 in /in/c9Snn on line 29
Sorry, wrong answer. (1)
- Output for 4.3.0 - 4.3.2, 5.0.0 - 5.0.1
- Notice: Uninitialized string offset: 1 in /in/c9Snn on line 28
Notice: Uninitialized string offset: 1 in /in/c9Snn on line 29
Sorry, wrong answer. (1)
preferences:
375.89 ms | 402 KiB | 459 Q