Ruby Solution for detecting squares

ruby/2013-detect-squares.rb

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+class DetectSquares
+ def initialize()
+ @points_count = Hash.new(0)
+ @points = [] 
+ end
+
+
+ def add(point)
+ @points_count[point] +=1
+ @points.append(point)
+ end
+
+ def count(point)
+ result = 0
+ px = point[0]
+ py = point[1]
+
+ @points.each do |p|
+ next if (((py-p[1]).abs != (px-p[0]).abs) || (p[0]==px) ||(p[1]==py))
+ result += @points_count[[p[0],py]] * @points_count[[px,p[1]]]
+ end
+
+ return result
+
+ end
+
+
+end