all tasks

Task/Sorting-algorithms-Radix-sort/Ruby/sorting-algorithms-radix-sort.rb

@@ -0,0 +1,24 @@
+class Array
+  def radix_sort(base=10)
+    ary = dup
+    rounds = (Math.log(self.max.abs)/Math.log(base)).ceil
+    rounds.times do |i|
+      buckets = Hash.new {|h,k| h[k] = []}
+      ary.each do |n|
+        digit = (n/base**i) % base
+        digit = digit + base unless n<0
+        buckets[digit] << n
+      end
+      ary = buckets.values_at(*(0..2*base)).compact.flatten
+      p [i, ary] if $DEBUG
+    end
+    ary
+  end
+  def radix_sort!(base=10)
+    replace radix_sort(base)
+  end
+end
+
+p [1, 3, 8, 9, 0, 0, 8, 7, 1, 6].radix_sort
+p [170, 45, 75, 90, 2, 24, 802, 66].radix_sort
+p [170, 45, 75, 90, 2, 24, -802, -66].radix_sort