Mastering the Top K Elements Pattern
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Questions and Answers

Which time complexity is required to solve a problem by sorting the list first and then finding the top k elements?

  • $O(n)$
  • $O(n \log(k))$
  • $O(n \log(n))$ (correct)
  • $O(k)$

    • Which time complexity is required to solve a problem using the top k elements pattern without sorting the list first?

  • $O(n)$
  • $O(k)$
  • $O(n \log(k))$ (correct)
  • $O(n \log(n))$

    • Which data structure is the best to keep track of the smallest or largest k elements?

  • Array
  • Stack
  • Heap (correct)
  • Linked List

    • Which type of heap should be used to find the smallest k elements?

    <p>Min-Heap</p> Signup and view all the answers

    Which type of heap should be used to find the largest k elements?

    <p>Max-Heap</p> Signup and view all the answers

    Which data structure provides O(1) access to the top k elements?

    <p>Min-Heap</p> Signup and view all the answers

    What is the time complexity of finding the top k elements using a min-heap?

    <p>O(n log k)</p> Signup and view all the answers

    When does the 'Top K Elements' pattern not apply?

    <p>When the input data structure supports random access</p> Signup and view all the answers

    Which real-world problem can be solved using the 'Top K Elements' pattern?

    <p>Finding the nearest drivers for a user</p> Signup and view all the answers

    What is the output string when sorting the characters 'buubble' by frequency using the 'Top K Elements' pattern?

    <p>'bbbuule'</p> Signup and view all the answers

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