Private Function Problem8() As Integer
Dim chars As Char() = "73167176531330624919225119674426574742355349194934" & _
"96983520312774506326239578318016984801869478851843" & _
"85861560789112949495459501737958331952853208805511" & _
"12540698747158523863050715693290963295227443043557" & _
"66896648950445244523161731856403098711121722383113" & _
"62229893423380308135336276614282806444486645238749" & _
"30358907296290491560440772390713810515859307960866" & _
"70172427121883998797908792274921901699720888093776" & _
"65727333001053367881220235421809751254540594752243" & _
"52584907711670556013604839586446706324415722155397" & _
"53697817977846174064955149290862569321978468622482" & _
"83972241375657056057490261407972968652414535100474" & _
"82166370484403199890008895243450658541227588666881" & _
"16427171479924442928230863465674813919123162824586" & _
"17866458359124566529476545682848912883142607690042" & _
"24219022671055626321111109370544217506941658960408" & _
"07198403850962455444362981230987879927244284909188" & _
"84580156166097919133875499200524063689912560717606" & _
"05886116467109405077541002256983155200055935729725" & _
"71636269561882670428252483600823257530420752963450"
Dim digits = Array.ConvertAll(chars, Function(c) CInt(c.ToString()))
Dim maxProduct = 0
'Dim theDigits As String = String.Empty
For i = 0 To digits.Length - 5
Dim product = digits(i)
For j = i + 1 To i + 4
product *= digits(j)
Next
If product > maxProduct Then
maxProduct = product
'theDigits = String.Join("", chars(i), chars(i + 1), chars(i + 2), chars(i + 3), chars(i + 4))
End If
Next
Return maxProduct
End Function