Created
May 31, 2013 04:46
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//http://euler.synap.co.kr/prob_detail.php?id=8 | |
//여기서 붉게 표시된 71112의 경우 7, 1, 1, 1, 2 각 숫자를 모두 곱하면 14가 됩니다. | |
//이런 식으로 맨 처음 (7 × 3 × 1 × 6 × 7 = 882) 부터 맨 끝 (6 × 3 × 4 × 5 × 0 = 0) 까지 5자리 숫자들의 곱을 구할 수 있습니다. | |
//이렇게 구할 수 있는 5자리 숫자의 곱 중에서 가장 큰 값은 얼마입니까? | |
object Euler_008 extends App { | |
val RAW_STR = """ | |
73167176531330624919225119674426574742355349194934 | |
96983520312774506326239578318016984801869478851843 | |
85861560789112949495459501737958331952853208805511 | |
12540698747158523863050715693290963295227443043557 | |
66896648950445244523161731856403098711121722383113 | |
62229893423380308135336276614282806444486645238749 | |
30358907296290491560440772390713810515859307960866 | |
70172427121883998797908792274921901699720888093776 | |
65727333001053367881220235421809751254540594752243 | |
52584907711670556013604839586446706324415722155397 | |
53697817977846174064955149290862569321978468622482 | |
83972241375657056057490261407972968652414535100474 | |
82166370484403199890008895243450658541227588666881 | |
16427171479924442928230863465674813919123162824586 | |
17866458359124566529476545682848912883142607690042 | |
24219022671055626321111109370544217506941658960408 | |
07198403850962455444362981230987879927244284909188 | |
84580156166097919133875499200524063689912560717606 | |
05886116467109405077541002256983155200055935729725 | |
71636269561882670428252483600823257530420752963450 | |
""" | |
def getArrayFromStr(rawStr:String, tempArray:Array[String] = Array[String](), wSize:Int = 5) : Array[String] = { | |
if(rawStr.length() < wSize) return tempArray | |
val tStr = rawStr.subSequence(0, 5).toString() | |
if(tStr.contains("0")) getArrayFromStr(rawStr.substring(1), tempArray, wSize) | |
else getArrayFromStr(rawStr.substring(1), tempArray:+tStr, wSize) | |
} | |
def getMulStrEles(inStr:String):Int = { | |
var tNum = 1 | |
inStr.foreach(tNum *= _.toString.toInt) | |
return tNum | |
} | |
def getMaxNumInArray(rawStr:String) : Int = { | |
var maxNum = 0 | |
val rawArray = getArrayFromStr(rawStr.replace("\n", "").trim()) | |
rawArray.foreach( x => { | |
val tempNum = getMulStrEles(x) | |
if(tempNum > maxNum) maxNum = tempNum | |
} | |
) | |
return maxNum | |
} | |
println(getMaxNumInArray(RAW_STR)) | |
} |
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