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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?

Min-Heap Signup and view all the answers

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

Max-Heap Signup and view all the answers

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

Min-Heap Signup and view all the answers

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

O(n log k) Signup and view all the answers

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

When the input data structure supports random access Signup and view all the answers

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

Finding the nearest drivers for a user Signup and view all the answers

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

'bbbuule' Signup and view all the answers