Sha256: c9396d89dd9bb4579a8cfb8fdd721f0fa8658fc5dc1ce3affc7a4cf59030366c
Contents?: true
Size: 749 Bytes
Versions: 396
Compression:
Stored size: 749 Bytes
Contents
class Series
@series : Array(Int64)
def initialize(series : String)
raise ArgumentError.new("Series contains non-digit characters") if series =~ /\D/
@series = series.chars.map(&.to_i).map(&.to_i64)
end
def largest_product(span : Int32) : Int64
raise ArgumentError.new("Invalid span") if span > @series.size || span < 0
return 1i64 if span == 0
product_from_sequence(create_sequences(span))
end
private def create_sequences(span : Int32) : Array(Array(Int64))
seq = @series.map_with_index do |n, i|
@series[i, span]
end
seq.select { |s| s.size == span }
end
private def product_from_sequence(seq : Array(Array(Int64))) : Int64
seq.map(&.product).sort { |a, b| b <=> a }.first
end
end
Version data entries
396 entries across 396 versions & 1 rubygems