Add Notes.md to LeetCode #506 'Relative Ranks'.

eminencegrs · Dec 12, 2024 · aece2f2 · aece2f2
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+# Theory
+
+**PriorityQueue<TElement,TPriority>** represents a collection of items that have a value and a priority.  
+
+- **It implements an array-backed, quaternary min-heap.**  
+- **Each element is enqueued with an associated priority that determines the dequeue order.**
+- **Elements with the lowest priority are dequeued first.**
+- **The type does not guarantee *first-in-first-out* semantics for elements of equal priority.**