Example

0_example.rb

# Use Gists to store entire functions
class QuickSort
 
  def self.sort!(keys)
    quick(keys,0,keys.size-1)
  end
 
  private
 
  def self.quick(keys, left, right)
    if left < right
      pivot = partition(keys, left, right)
      quick(keys, left, pivot-1)
      quick(keys, pivot+1, right)
    end
    keys
  end
 
  def self.partition(keys, left, right)
    x = keys[right]
    i = left-1
    for j in left..right-1
      if keys[j] <= x
        i += 1
        keys[i], keys[j] = keys[j], keys[i]
      end
    end
    keys[i+1], keys[right] = keys[right], keys[i+1]
    i+1
  end
 
end

1_circular_imageview.xml

<!--Give an imageview a circular foreground-->

<!--Requires dependencies-->
<!--compile 'com.android.support:appcompat-v7:23.1.1'-->
<!--compile 'com.android.support:design:23.1.1'-->
<!--compile 'com.android.support:cardview-v7:23.1.1'-->
    
    <android.support.v7.widget.CardView
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:elevation="12dp"
        android:id="@+id/view2"
        app:cardCornerRadius="40dp"
        android:layout_centerHorizontal="true"
        android:innerRadius="0dp"
        android:shape="ring"
        android:thicknessRatio="1.9">
        <ImageView
            android:layout_height="80dp"
            android:layout_width="match_parent"
            android:id="@+id/imageView1"
            android:src="@drawable/test_pic"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true">
        </ImageView>
    </android.support.v7.widget.CardView>