project euler / Tags / Martin Caine

I'm a professional game developer from Wakefield, England, working as a senior programmer for Rebellion North.

I'm a married father of five and I a also sometimes do Retroburn stuff.

Martin 'Bytrix' Caine

Father. C++ Games Programmer. Cyclist. Guitarist.

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Project Euler - Problem 8



<?
/******************************************************************
*  ProjectEuler.net  *  Problem 8  *  2010-05-31  *  Martin Caine *
******************************************************************/

$string  = '73167176531330624919225119674426574742355349194934';
$string .= '96983520312774506326239578318016984801869478851843';
$string .= '85861560789112949495459501737958331952853208805511';
$string .= '12540698747158523863050715693290963295227443043557';
$string .= '66896648950445244523161731856403098711121722383113';
$string .= '62229893423380308135336276614282806444486645238749';
$string .= '30358907296290491560440772390713810515859307960866';
$string .= '70172427121883998797908792274921901699720888093776';
$string .= '65727333001053367881220235421809751254540594752243';
$string .= '52584907711670556013604839586446706324415722155397';
$string .= '53697817977846174064955149290862569321978468622482';
$string .= '83972241375657056057490261407972968652414535100474';
$string .= '82166370484403199890008895243450658541227588666881';
$string .= '16427171479924442928230863465674813919123162824586';
$string .= '17866458359124566529476545682848912883142607690042';
$string .= '24219022671055626321111109370544217506941658960408';
$string .= '07198403850962455444362981230987879927244284909188';
$string .= '84580156166097919133875499200524063689912560717606';
$string .= '05886116467109405077541002256983155200055935729725';
$string .= '71636269561882670428252483600823257530420752963450';

$max = 0;

for( $i=0; $i<996; $i++ )
{
    $sum = intval( substr( $string, $i, 1 ) ) *
                 intval( substr( $string, $i+1, 1 ) ) *
                 intval( substr( $string, $i+2, 1 ) ) *
                 intval( substr( $string, $i+3, 1 ) ) *
                 intval( substr( $string, $i+4, 1 ) );
    if( $sum > $max )
    {
        $max = $sum;
    }    
}

echo $max;
?>

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - Problem 7



<?
/******************************************************************
*  ProjectEuler.net  *  Problem 7  *  2010-05-31  *  Martin Caine *
******************************************************************/

// create an array to store the primes
$primes = array();
$primes[] = 2;
// count the primes
$i = 1;

$n = 2;

// break when we get to 10001
while( $i < 10001 )
{
    $n++;
    $isPrime = true;
    foreach( $primes as $prime )
    {
        if( ($n/$prime) == (int)($n/$prime) )
        {
            $isPrime = false;
            break;
        }
    }
    
    if( $isPrime )
    {
        $primes[] = $n;
        $i++;
    }
}

echo $primes[10000];

?>

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Tags: php project euler web

Monday, May 31st 2010 / Web

Project Euler - Problem 6

It took less than a minute to complete puzzle number 6 from Project Euler:

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Monday, May 31st 2010 / Web

Project Euler - problem 5

Problem 5 (yes these are pretty quick ones) from Project Euler is a really easy one again:

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Monday, May 31st 2010 / Web

Project Euler - problem 4

Another pretty easy one from Project Euler, puzzle 4 simply required building an array of values based on calculations and sorting them to find the highest values:

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Monday, May 31st 2010 / Web

Project Euler - problem 3

The third problem from Project Euler was a little more complex:

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Monday, May 31st 2010 / Web

Project Euler - problem 2

The second Project Euler problem was another simple one:

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Monday, May 31st 2010 / Web

Someone I'm following on Twitter posted a link to an interesting site called Project Euler. It's full of interesting maths puzzles which are designed in such a way that you should create a program to calculate the result for you.

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Tags: php project euler web