MadelineProto/prime.php
2016-06-26 12:59:15 +02:00

217 lines
6.2 KiB
PHP

<?php
set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . DIRECTORY_SEPARATOR . 'libpy2php');
require_once ('libpy2php.php');
function everynth($array, $n) {
$result = array();
$i = -1;
foreach($array as $key => $value) {
if ($i++ == $n) {
$i = 0;
}
if($i == 0) {
$result[$key] = $value;
}
}
return $result;
}
function primesbelow($N) {
$correction = (($N % 6) > 1);
$N = [0 => $N, 1 => ($N - 1), 2 => ($N + 4), 3 => ($N + 3), 4 => ($N + 2), 5 => ($N + 1) ][($N % 6) ];
$sieve = array_fill(0, floor($N / 3), true);
$sieve[0] = false;
foreach (pyjslib_range((floor(pyjslib_int(pow($N, 0.5)) / 3) + 1)) as $i) {
if ($sieve[$i]) {
$k = ((3 * $i) + 1) | 1;
$sieve = array_merge($sieve, array_merge(everynth(array_splice($sieve, floor($k*$k / 3)), 2*$k), (array_fill(0, floor(((floor($N / 6) - floor(($k * $k) / 6)) - 1) / $k) + 1, false))));
$sieve = array_merge(
$sieve, array_merge(
everynth(
array_splice(
$sieve, floor(
(
$k*$k + 4*$k - 2*$k*($i%2)
) / 3
)
), 2*$k
),
(
array_fill(
0,
(
floor(
(
(
floor(
$N / 6
) - floor(
(
(
($k * $k) + (4 * $k)
) - (
(2 * $k) * ($i % 2)
)
) / 6
)
) - 1
) / $k
) + 1
),
false
)
)
)
);
}
}
return ([2, 3] + array_map(function ($i, $sieve) { if($sieve[$i]) return (3 * $i + 1) | 1; }, pyjslib_range(1, (($N / 3) - $correction)), $sieve));
}
$smallprimeset = array_unique(primesbelow(100000));
$_smallprimeset = 100000;
function isprime($n, $precision = 7) {
if (($n == 1) || (($n % 2) == 0)) {
return false;
} else if (($n < 1)) {
throw new $ValueError('Out of bounds, first argument must be > 0');
} else if (($n < $_smallprimeset)) {
return in_array($n, $smallprimeset);
}
$d = ($n - 1);
$s = 0;
while ((($d % 2) == 0)) {
$d = floor($d /2);
$s+= 1;
}
foreach (pyjslib_range($precision) as $repeat) {
$a = random::randrange(2, ($n - 2));
$x = pow($a, $d, $n);
if (($x == 1) || ($x == ($n - 1))) {
continue;
}
foreach (pyjslib_range(($s - 1)) as $r) {
$x = pow($x, 2, $n);
if (($x == 1)) {
return false;
}
if (($x == ($n - 1))) {
break;
}
}
}
return true;
}
function pollard_brent($n) {
if ((($n % 2) == 0)) {
return 2;
}
if ((($n % 3) == 0)) {
return 3;
}
list($y, $c, $m) = [random::randint(1, ($n - 1)), random::randint(1, ($n - 1)), random::randint(1, ($n - 1)) ];
list($g, $r, $q) = [1, 1, 1];
while (($g == 1)) {
$x = $y;
foreach (pyjslib_range($r) as $i) {
$y = ((pow($y, 2, $n) + $c) % $n);
}
$k = 0;
while (($k < $r) && ($g == 1)) {
$ys = $y;
foreach (pyjslib_range(min($m, ($r - $k))) as $i) {
$y = ((pow($y, 2, $n) + $c) % $n);
$q = (($q * abs(($x - $y))) % $n);
}
$g = gcd($q, $n);
$k+= $m;
}
$r*= 2;
}
if (($g == $n)) {
while (true) {
$ys = ((pow($ys, 2, $n) + $c) % $n);
$g = gcd(abs(($x - $ys)), $n);
if (($g > 1)) {
break;
}
}
}
return $g;
}
$smallprimes = primesbelow(10000);
function primefactors($n, $sort = false) {
$factors = [];
$limit = (pyjslib_int(pow($n, 0.5)) + 1);
foreach ($smallprimes as $checker) {
if (($checker > $limit)) {
break;
}
while ((($n % $checker) == 0)) {
$factors[] = $checker;
$n = floor($n / $checker);
$limit = (pyjslib_int(pow($n, 0.5)) + 1);
if (($checker > $limit)) {
break;
}
}
}
if (($n < 2)) {
return $factors;
}
while (($n > 1)) {
if (isprime($n)) {
$factors[] = $n;
break;
}
$factor = pollard_brent($n);
$factors->extend(primefactors($factor));
$n = floor($n / $factor);
}
if ($sort) {
$factors->sort();
}
return $factors;
}
function factorization($n) {
$factors = [];
foreach (primefactors($n) as $p1) {
try {
$factors[$p1]+= 1;
}
catch(KeyError $e) {
$factors[$p1] = 1;
}
}
return $factors;
}
$totients = [];
function totient($n) {
if (($n == 0)) {
return 1;
}
try {
return $totients[$n];
}
catch(KeyError $e) {
}
$tot = 1;
foreach (factorization($n)->items() as list($p, $exp)) {
$tot*= (($p - 1) * pow($p, ($exp - 1)));
}
$totients[$n] = $tot;
return $tot;
}
function gcd($a, $b) {
if (($a == $b)) {
return $a;
}
while (($b > 0)) {
list($a, $b) = [$b, ($a % $b) ];
}
return $a;
}
function lcm($a, $b) {
return floor(abs(($a * $b)) / gcd($a, $b));
}