You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.4 KiB
PHP
39 lines
1.4 KiB
PHP
<?php
|
|
/*
|
|
* Gnieark's anwser to euler problem 8
|
|
* https://projecteuler.net/problem=8
|
|
*/
|
|
$string='73167176531330624919225119674426574742355349194934
|
|
96983520312774506326239578318016984801869478851843
|
|
85861560789112949495459501737958331952853208805511
|
|
12540698747158523863050715693290963295227443043557
|
|
66896648950445244523161731856403098711121722383113
|
|
62229893423380308135336276614282806444486645238749
|
|
30358907296290491560440772390713810515859307960866
|
|
70172427121883998797908792274921901699720888093776
|
|
65727333001053367881220235421809751254540594752243
|
|
52584907711670556013604839586446706324415722155397
|
|
53697817977846174064955149290862569321978468622482
|
|
83972241375657056057490261407972968652414535100474
|
|
82166370484403199890008895243450658541227588666881
|
|
16427171479924442928230863465674813919123162824586
|
|
17866458359124566529476545682848912883142607690042
|
|
24219022671055626321111109370544217506941658960408
|
|
07198403850962455444362981230987879927244284909188
|
|
84580156166097919133875499200524063689912560717606
|
|
05886116467109405077541002256983155200055935729725
|
|
71636269561882670428252483600823257530420752963450';
|
|
|
|
$string=str_replace("\n","",$string);
|
|
$digits=str_split($string);
|
|
$value=0;
|
|
for($pos=0;$pos<strlen($string)-13;$pos++){
|
|
$product=1;
|
|
for($i=$pos;$i<$pos+13;$i++){
|
|
$product=$digits[$i]*$product;
|
|
}
|
|
if($product > $value){
|
|
$value=$product;
|
|
}
|
|
}
|
|
echo $value; |