http://docs.oracle.com/javase/7/docs/api/java/util/PriorityQueue.html#add%28E%29
Implementation note: this implementation provides O(log(n)) time for the enqueing and dequeing methods (offer, poll, remove() and add); linear time for the remove(Object) and contains(Object) methods; and constant time for the retrieval methods (peek, element, and size).
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