From 8ea872bab295e8f59a6210adb6852b85a2d75d9d Mon Sep 17 00:00:00 2001
From: brettmortensen <11483419+brettmortensen@users.noreply.github.com>
Date: Tue, 20 Oct 2020 21:45:43 -0600
Subject: [PATCH] Add Bead Sort algorithm

Adds a Ruby implementation of the Bead Sort algorithm.
---
 algorithms/sorting/bead_sort.rb | 78 +++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 algorithms/sorting/bead_sort.rb

diff --git a/algorithms/sorting/bead_sort.rb b/algorithms/sorting/bead_sort.rb
new file mode 100644
index 0000000..e4a687f
--- /dev/null
+++ b/algorithms/sorting/bead_sort.rb
@@ -0,0 +1,78 @@
+# A Ruby implementation of the Bead Sort algorithm
+#
+# "I" represents empty space in the bead grid
+# "O" represents a bead in the bead grid
+
+require "pp"
+
+def bead_sort(unsorted_array)
+  # Display unsorted array
+  puts "Unsorted array"
+  pp unsorted_array
+  puts "\n"
+
+  # Fill bead grid with values
+  bead_grid = Array.new(unsorted_array.length) { Array.new(unsorted_array.max, "I") }
+  unsorted_array.each_with_index do |value, index|
+    while value > 0
+      value = value - 1
+      bead_grid[index][value] = "O"
+    end
+  end
+
+  # Display initial bead grid
+  puts "Initial bead grid"
+  pp bead_grid
+  puts "\n"
+
+  # Let "gravity" sort the bead grid
+  bead_grid = bead_grid.transpose
+  bead_grid.each do |value|
+    value.sort!
+  end
+  bead_grid = bead_grid.transpose
+
+  # Display resulting bead grid
+  puts "Resulting bead grid"
+  pp bead_grid
+  puts "\n"
+
+  # Count beads to get sorted array
+  sorted_array = []
+  bead_grid.each do |value|
+    sorted_array.append(value.count("O"))
+  end
+
+  # Display sorted array
+  puts "Sorted array"
+  pp sorted_array
+  puts "\n"
+
+  # Return sorted array
+  sorted_array
+end
+
+# Testing the algorithm
+array = [5, 2, 0, 1]
+bead_sort(array)
+
+# Output
+#
+# Unsorted array
+# [5, 2, 0, 1]
+#
+# Initial bead grid
+# [["O", "O", "O", "O", "O"],
+#  ["O", "O", "I", "I", "I"],
+#  ["I", "I", "I", "I", "I"],
+#  ["O", "I", "I", "I", "I"]]
+#
+# Resulting bead grid
+# [["I", "I", "I", "I", "I"],
+#  ["O", "I", "I", "I", "I"],
+#  ["O", "O", "I", "I", "I"],
+#  ["O", "O", "O", "O", "O"]]
+#
+# Sorted array
+# [0, 1, 2, 5]
+#