Commit 239be7a

@@ -35,13 +35,16 @@ class Solution
   # space: O(n) ?
   def run(row)
     cards = row.split
+    cache = Hash.new do |hash, key|
+      hash[key] = Card.new(key)
+    end
 
     for i in (0...cards.size)
-      x = Card.new(cards[i])
+      x = cache[cards[i]]
       for p in (i+1...cards.size)
-        y = Card.new(cards[p])
+        y = cache[cards[p]]
         for q in (p+1...cards.size)
-          z = Card.new(cards[q])
+          z = cache[cards[q]]
           if x.match?(y, z)
             return [x, y, z].map(&:to_s).join(' ')
           end
@@ -51,9 +54,6 @@ class Solution
 
     ""
   end
-
-  private
-
 end
 
 assert_equal(true, Card.new("+C").match?(Card.new("-CC"), Card.new("=CCC")))