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Task/Sorting-algorithms-Counting-sort/Ruby/sorting-algorithms-counting-sort.rb

@@ -0,0 +1,24 @@
+class Array
+  def countingsort!
+    do_countingsort!(min, max)
+  end
+
+  protected
+  def do_countingsort!(min, max)
+    count = Array.new(max - min + 1, 0)
+    each {|number| count[number - min] += 1}
+    z = 0
+    min.upto(max) do |i|
+      while count[i - min] > 0
+        self[z] = i
+        z += 1
+        count[i - min] -= 1
+      end
+    end
+    self
+  end
+end
+
+ary = [9,7,10,2,9,7,4,3,10,2,7,10,2,1,3,8,7,3,9,5,8,5,1,6,3,7,5,4,6,9,9,6,6,10,2,4,5,2,8,2,2,5,2,9,3,3,5,7,8,4]
+ary.countingsort!.join(",")
+# => "1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,4,4,4,4,5,5,5,5,5,5,6,6,6,6,7,7,7,7,7,7,8,8,8,8,9,9,9,9,9,9,10,10,10,10"