solved part 1

day10/input.small

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+16
+10
+15
+5
+1
+11
+7
+19
+6
+12
+4

day10/solution1.rb

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+#!/bin/env ruby
+require 'pry'
+numbers = File.read('./input').split("\n").map(&:to_i).sort
+
+solution = numbers.map.with_index do |num, i|
+    next if i == 0
+    num - numbers[i-1]
+end
+#binding.pry
+final = [solution.count(1)+1, solution.count(3)+1]
+pp final, final.reduce(&:*)