kazua

<?php
//write kazua

//素数チェック
//$value 素数かどうかをチェックする値
function pc($value) {
    static $p = array();
    if (is_int($value) === false || $value <= 1) return false;
    else if (array_key_exists($value, $p) === true) return $p[$value];
    $a = range(1, (int) round($value / 2));

kazua

<?php
//http://odz.sakura.ne.jp/projecteuler/index.php?cmd=read&page=Problem%2021
//write kazua
$y = array();

$f = function($num) {
    global $y;
    $d = array();
    for ($i = 1; $i <= $num / 2; $i++) if ($num % $i == 0) $d[] = $i;
    $y[$num] = array_sum($d);

kazua

<?php
//http://odz.sakura.ne.jp/projecteuler/index.php?cmd=read&page=Problem%2020
//write kazua
function array_bcproduct($a) {
    $r = "1";
    foreach ($a as $v)
        $r = bcmul($r, $v);
    return $r;
}
echo array_sum(str_split(array_bcproduct(range(1, 100))));

kazua

<?php
//array_bcproduct
//write kazua

//$a array
function array_bcproduct($a) {
    $r = "1";
    foreach ($a as $v)
        $r = bcmul($r, $v);
    return $r;

kazua

<?php
//array_scanLeftとarray_scanRight
//write kazua

//$a array
//$f callback
//$i initial

function array_scanLeft($a, $f, $i) {
    $r = array($i);

kazua

<?php
//http://odz.sakura.ne.jp/projecteuler/index.php?cmd=read&page=Problem%2080
//write kazua
echo
    array_sum(
        array_map(
            function ($value) {
                return
                    array_sum(
                        str_split(

kazua

//http://projecteuler.net/index.php?section=problems&id=80(英語)
//http://odz.sakura.ne.jp/projecteuler/index.php?cmd=read&page=Problem%2080

//Kazua

import java.math.BigDecimal
import java.math.RoundingMode

object problem80 {
    def sqrt(n : Int, s : Int, sr : BigDecimal = BigDecimal.valueOf(-1)) : BigDecimal = n match {

kazua

<?php
//http://odz.sakura.ne.jp/projecteuler/index.php?cmd=read&page=Problem%2016
//write kazua
echo array_sum(str_split(bcpow(2, 1000)));

kazua

<?php
//write kazua
$n = 20;
echo array_product(range(1, 2 * $n)) / pow(array_product(range(1, $n)), 2);

kazua

<?php
//write kazua
echo pow(array_sum(range(1, 100)), 2)
        - array_sum(array_map(function ($value) {
                            return pow($value, 2);
                        },
                        range(1, 100)));