w3resource

Python: Find the kth largest element in an unsorted array using Heap queue algorithm

Python heap queue algorithm: Exercise-7 with Solution

Write a Python program to find the kth (1 <= k <= array's length) largest element in an unsorted array using the heap queue algorithm.

Sample Solution:

Python Code:

import heapq

class Solution(object):
    def find_Kth_Largest(self, nums, k):
        """
        :type nums: List[int]
        :type of k: int
        :return value type: int
        """
        h = []
        for e in nums:
            heapq.heappush(h, (-e, e))
        for i in range(k):
            w, e = heapq.heappop(h)
            if i == k - 1:
                return e

arr_nums = [12, 14, 9, 50, 61, 41]
s = Solution()
result = s.find_Kth_Largest(arr_nums, 3)
print("Third largest element:",result)
result = s.find_Kth_Largest(arr_nums, 2)
print("\nSecond largest element:",result)
result = s.find_Kth_Largest(arr_nums, 5)
print("\nFifth largest element:",result)

Sample Output:

Third largest element: 41

Second largest element: 50

Fifth largest element: 12

Flowchart:

Python heap queue algorithm: Find the kth largest element in an unsorted array using Heap queue algorithm.

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to sort a given list of elements in ascending order using Heap queue algorithm.
Next: Write a Python program to compute maximum product of three numbers of a given array of integers using Heap queue algorithm.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://198.211.115.131/python-exercises/heap-queue-algorithm/python-heapq-exercise-7.php