Project Euler: Problem 8

The next problem in our collection of maxscript experiments in Project Euler is problem No. 8:

Find the greatest product of five consecutive digits in the 1000-digit number.

    73167176531330624919225119674426574742355349194934     96983520312774506326239578318016984801869478851843     85861560789112949495459501737958331952853208805511     12540698747158523863050715693290963295227443043557     66896648950445244523161731856403098711121722383113     62229893423380308135336276614282806444486645238749     30358907296290491560440772390713810515859307960866     70172427121883998797908792274921901699720888093776     65727333001053367881220235421809751254540594752243     52584907711670556013604839586446706324415722155397     53697817977846174064955149290862569321978468622482     83972241375657056057490261407972968652414535100474     82166370484403199890008895243450658541227588666881     16427171479924442928230863465674813919123162824586     17866458359124566529476545682848912883142607690042     24219022671055626321111109370544217506941658960408     07198403850962455444362981230987879927244284909188     84580156166097919133875499200524063689912560717606     05886116467109405077541002256983155200055935729725     71636269561882670428252483600823257530420752963450

For a change, this is quite a no-brainer. I saved the number in the original format of individual lines as a txt file and used a memStream to read it. Although I could have just as well used fileStream, this is supposed to be a little faster. The sole purpose of the _int function is to shorten the code later on. All the lines are appended to a string (using stringStream didn't result in any benefit), which is then iterated over and for each five numbers a product is calculated and assigned to a midResult variable. If it is bigger than a previously saved value, we replace it with it:

    fn _int str =
        nr = str as integer

    fn getNum filePath =
        local result = ""
        local fileStream = memStreamMgr.openFile filePath

        while NOT fileStream.eos() do
            append result (fileStream.readLine())

        memStreamMgr.close fileStream

    local nr = getNum "Z:\Euler\prob8.txt"
    local length = nr.count - 4
    local midResult, result = 0

    for i = 1 to length
        where (midResult = _int(nr[i])*_int(nr[i+1])*_int(nr[i+2])*_int(nr[i+3])*_int(nr[i+4])) > result do
            result = midResult

DISCLAIMER: All scripts and snippets are provided as is under Creative Commons Zero (public domain, no restrictions) license. The author and this blog cannot be held liable for any loss caused as a result of inaccuracy or error within these web pages. Use at your own risk.

This Post needs Your Comment!

Return to top