Pattern

Heap

4 problems in the roadmap use this pattern.

• Top K Frequent Elements Medium

  in Arrays, Strings & Hashing

  Reported at: MetaAmazonMicrosoft+7
• Kth Smallest Element in a Sorted Matrix Medium

  in Binary Search

  Reported at: MetaAmazonGoogle+5
• Merge k Sorted Lists Hard

  in Linked List

  Reported at: MetaAmazonMicrosoft+9
• Minimum Number of Refueling Stops Hard

  in Greedy