From 04ad75f4916cf2358f48c720b44e67b25f2da063 Mon Sep 17 00:00:00 2001
From: Ysmael Ebreo <Ysmael.Ebreo@latticesemi.com>
Date: Sat, 11 Apr 2020 01:17:01 +0800
Subject: Ruby solutions for ch#55

---
 challenge-055/yet-ebreo/ruby/ch-1.rb | 47 ++++++++++++++++++++++++++++++++++++
 challenge-055/yet-ebreo/ruby/ch-2.rb | 43 +++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 challenge-055/yet-ebreo/ruby/ch-1.rb
 create mode 100644 challenge-055/yet-ebreo/ruby/ch-2.rb

diff --git a/challenge-055/yet-ebreo/ruby/ch-1.rb b/challenge-055/yet-ebreo/ruby/ch-1.rb
new file mode 100644
index 0000000000..bd2c19a892
--- /dev/null
+++ b/challenge-055/yet-ebreo/ruby/ch-1.rb
@@ -0,0 +1,47 @@
+#!/usr/bin/ruby
+
+bin_str = ARGV[0] || '010'
+len     = bin_str.length
+num     = bin_str.to_i(2)
+
+res     = []
+max     = 0
+
+for left in 0..len-1
+    for right in left..len-1
+        bin = num
+        for number in left..right
+            bin ^= 1 << len - number - 1
+        end
+        
+        ones = bin.to_s(2).count('1')
+        if ones > max then
+            max = ones
+            res.clear
+        end
+        if ones == max then
+            res.push("#{left} #{right}")
+        end
+    end
+end
+
+puts "Pair of L-R (one's = #{max}):";
+for out in res
+    puts out
+end
+
+=begin
+ruby .\ch-1.rb  
+Pair of L-R (one's = 2):
+0 0
+0 2
+2 2
+
+ruby .\ch-1.rb  0101101101
+Pair of L-R (one's = 7):
+0 0
+0 2
+2 2
+5 5
+8 8
+=end
\ No newline at end of file
diff --git a/challenge-055/yet-ebreo/ruby/ch-2.rb b/challenge-055/yet-ebreo/ruby/ch-2.rb
new file mode 100644
index 0000000000..fb1358e50d
--- /dev/null
+++ b/challenge-055/yet-ebreo/ruby/ch-2.rb
@@ -0,0 +1,43 @@
+#!/usr/bin/ruby
+
+narray = (ARGV.sort)
+hash   = {}
+for elem in narray.permutation.to_a
+    flag = 1
+    for e in 1..elem.length-1
+         e % 2 > 0?
+            flag &= (elem[e] <= elem[e-1] ? 1 : 0)
+        :
+            flag &= (elem[e] >= elem[e-1] ? 1 : 0)
+        
+        break if !flag
+    end
+    if flag > 0
+        hold = elem.join(' ')
+        puts hold if !hash[hold]
+        hash[hold] = 1
+    end
+end
+
+=begin
+ruby .\ch-2.rb  1 2 3 4
+2 1 4 3
+3 1 4 2
+3 2 4 1
+4 1 3 2
+4 2 3 1
+
+ruby .\ch-2.rb  1 2 2 3 4
+2 1 3 2 4
+2 1 4 2 3
+2 2 3 1 4
+2 2 4 1 3
+3 1 2 2 4
+3 1 4 2 2
+3 2 2 1 4
+3 2 4 1 2
+4 1 2 2 3
+4 1 3 2 2
+4 2 2 1 3
+4 2 3 1 2
+=end
\ No newline at end of file
-- 
cgit