From 68062715c020b364b86f84f97113f75eb7e3c074 Mon Sep 17 00:00:00 2001
From: Andrew Tomaka <atomaka@gmail.com>
Date: Thu, 5 Apr 2012 08:10:04 -0400
Subject: [PATCH] First five problems in Ruby and (mostly) simplified to
 one-liners.

---
 Ruby/1-a.rb      | 10 ++++++++++
 Ruby/1-b.rb      |  6 ++++++
 Ruby/1-c.rb      |  3 +++
 Ruby/2-a.rb      | 11 +++++++++++
 Ruby/2-conrad.rb |  3 +++
 Ruby/3-a.rb      |  4 ++++
 Ruby/4-a.rb      |  3 +++
 Ruby/5-a.rb      | 20 ++++++++++++++++++++
 Ruby/5-b.rb      |  3 +++
 9 files changed, 63 insertions(+)
 create mode 100755 Ruby/1-a.rb
 create mode 100755 Ruby/1-b.rb
 create mode 100755 Ruby/1-c.rb
 create mode 100755 Ruby/2-a.rb
 create mode 100755 Ruby/2-conrad.rb
 create mode 100755 Ruby/3-a.rb
 create mode 100755 Ruby/4-a.rb
 create mode 100755 Ruby/5-a.rb
 create mode 100755 Ruby/5-b.rb

diff --git a/Ruby/1-a.rb b/Ruby/1-a.rb
new file mode 100755
index 0000000..f0a59e9
--- /dev/null
+++ b/Ruby/1-a.rb
@@ -0,0 +1,10 @@
+#!/usr/bin/env ruby
+
+sum = 0;
+(1..999).each do |i|
+	if(i % 3 == 0 || i % 5 == 0) then
+		sum += i
+	end
+end
+
+puts sum
\ No newline at end of file
diff --git a/Ruby/1-b.rb b/Ruby/1-b.rb
new file mode 100755
index 0000000..a5f2134
--- /dev/null
+++ b/Ruby/1-b.rb
@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+
+sum = 0;
+(1..999).each { |i| sum += i if (i % 3 == 0 || i % 5 == 0) }
+
+puts sum
\ No newline at end of file
diff --git a/Ruby/1-c.rb b/Ruby/1-c.rb
new file mode 100755
index 0000000..cd1f367
--- /dev/null
+++ b/Ruby/1-c.rb
@@ -0,0 +1,3 @@
+#!/usr/bin/env ruby
+
+puts (1...1000).select{ |i| i % 3 == 0 || i % 5 == 0 }.inject(:+)
\ No newline at end of file
diff --git a/Ruby/2-a.rb b/Ruby/2-a.rb
new file mode 100755
index 0000000..a7915c7
--- /dev/null
+++ b/Ruby/2-a.rb
@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+
+sum = 0
+i = j = 1
+
+until (i >= 4000000)
+	i, j = j, i + j
+	sum += i if(i.even?)
+end
+
+puts sum
\ No newline at end of file
diff --git a/Ruby/2-conrad.rb b/Ruby/2-conrad.rb
new file mode 100755
index 0000000..a83d890
--- /dev/null
+++ b/Ruby/2-conrad.rb
@@ -0,0 +1,3 @@
+#!/usr/bin/env ruby
+
+puts Enumerator.new { |yielder| i, j = 0, 1; loop {i, j = j, i + j; yielder.yield i} }.take_while { |n| n <= 4E6}.select { |i| i.even? }.inject(:+)
diff --git a/Ruby/3-a.rb b/Ruby/3-a.rb
new file mode 100755
index 0000000..92cf52c
--- /dev/null
+++ b/Ruby/3-a.rb
@@ -0,0 +1,4 @@
+#!/usr/bin/env ruby
+
+require 'prime'
+puts Prime.prime_division(600851475143).last[0]
\ No newline at end of file
diff --git a/Ruby/4-a.rb b/Ruby/4-a.rb
new file mode 100755
index 0000000..2518bb5
--- /dev/null
+++ b/Ruby/4-a.rb
@@ -0,0 +1,3 @@
+#!/usr/bin/env ruby
+
+p (100...1000).to_a.map{ |i| (100...1000).to_a.map{ |j| i *j } }.flatten(1).select { |i| i.to_s == i.to_s.reverse }.sort.last
\ No newline at end of file
diff --git a/Ruby/5-a.rb b/Ruby/5-a.rb
new file mode 100755
index 0000000..5b33870
--- /dev/null
+++ b/Ruby/5-a.rb
@@ -0,0 +1,20 @@
+#!/usr/bin/env ruby
+
+i = 20
+while true do 
+	20.downto(1) { |j|
+		break if i % j != 0
+		@done = true if j == 1
+	}
+
+	break if @done
+
+	if i > 232792560 then
+		puts 'fail'
+		break
+	end
+
+	i += 20
+end
+
+puts i
diff --git a/Ruby/5-b.rb b/Ruby/5-b.rb
new file mode 100755
index 0000000..1689d6f
--- /dev/null
+++ b/Ruby/5-b.rb
@@ -0,0 +1,3 @@
+#!/usr/bin/env ruby
+
+ puts (1..20).inject(1) { |lcm, n| lcm.lcm(n) }
\ No newline at end of file