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exercism-80 Largest Series Prodcut

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`@@ -305,6 +305,7 @@ solution of many challenges of [Leetcode](https://leetcode.com/), [Exercism](htt`
`305`	`305`	`77. [Simple Linked List](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/simple_linked_list.rb)`
`306`	`306`	`78. [Binary Search Tree](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/binary_search_tree.rb)`
`307`	`307`	`79. [Rotational Cipher](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/rotational_cipher.rb)`
	`308`	`+80. [Largest Series Product](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/largest_series_product.rb)`
`308`	`309`
`309`	`310`	`<a name="leetcode"/>`
`310`	`311`

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	`1`	`+# problem: https://exercism.org/tracks/ruby/exercises/largest-series-product`
	`2`	`+`
	`3`	`+# Solution(idiomatic ruby- using each_cons)`
	`4`	`+class Series`
	`5`	`+ def initialize(series)`
	`6`	`+ @series = series`
	`7`	`+ end`
	`8`	`+ def largest_product(span)`
	`9`	`+ raise ArgumentError if span<=0 or span>@series.length or !@series.scan(/\D/).empty?`
	`10`	`+ max_product =0`
	`11`	`+ @series.chars.each_cons(span) do \|number\|`
	`12`	`+ curr_product = 1`
	`13`	`+ number.each do \|digit\|`
	`14`	`+ curr_product*=digit.to_i`
	`15`	`+ end`
	`16`	`+ max_product = max_product >curr_product ? max_product : curr_product`
	`17`	`+ end`
	`18`	`+ max_product`
	`19`	`+ end`
	`20`	`+end`
	`21`	`+`
	`22`	`+# Solution`
	`23`	`+class Series`
	`24`	`+ def initialize(series)`
	`25`	`+ @series = series`
	`26`	`+ end`
	`27`	`+`
	`28`	`+ def largest_product(span)`
	`29`	`+ raise ArgumentError if span<=0 or span>@series.length or !@series.scan(/\D/).empty?`
	`30`	`+ max_product =0`
	`31`	`+ curr_product = 1`
	`32`	`+ for i in 0..(@series.length-span)`
	`33`	`+ @series[i...(span+i)].chars.each do \|digit\|`
	`34`	`+ curr_product*= digit.to_i`
	`35`	`+ end`
	`36`	`+ max_product = max_product>curr_product ? max_product: curr_product`
	`37`	`+ curr_product = 1`
	`38`	`+ end`
	`39`	`+ max_product`
	`40`	`+ end`
	`41`	`+end`
	`42`	`+`

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