Data commit

Task/Sorting-Algorithms-Circle-Sort/Ruby/sorting-algorithms-circle-sort.rb

@@ -0,0 +1,31 @@
+class Array
+  def circle_sort!
+    while _circle_sort!(0, size-1) > 0
+    end
+    self
+  end
+
+  private
+  def _circle_sort!(lo, hi, swaps=0)
+    return swaps if lo == hi
+    low, high = lo, hi
+    mid = (lo + hi) / 2
+    while lo < hi
+      if self[lo] > self[hi]
+        self[lo], self[hi] = self[hi], self[lo]
+        swaps += 1
+      end
+      lo += 1
+      hi -= 1
+    end
+    if lo == hi && self[lo] > self[hi+1]
+      self[lo], self[hi+1] = self[hi+1], self[lo]
+      swaps += 1
+    end
+    swaps + _circle_sort!(low, mid) + _circle_sort!(mid+1, high)
+  end
+end
+
+ary = [6, 7, 8, 9, 2, 5, 3, 4, 1]
+puts "before sort: #{ary}"
+puts " after sort: #{ary.circle_sort!}"