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Priority Queue & Heap
Problem 347: Top K Frequent Elements
Problem 239: Sliding Window Maximum
Deque & Monotonic Queue
Problem 150: Evaluate Reverse Polish Notation
Problem 1047: Remove All Adjacent Duplicates In String
Problem 20: Valid Parentheses
Problem 225: Implement Stack using Queues
Problem 232: Implement Queue using Stacks
Problem 459: Repeated Substring Pattern