title: Find an element in a PriorityQueue by key
body: <p>Suppose I've been given some key. What I'd like to find is an element in the priority queue such that it's key equal or greater than the given key.</p>
  
  <p>Obviously, I want to it to be done in <code>O(logn)</code>. I'm almost certain Java offers such method yet couldn't find it (looked in the official docs)</p>