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K Largest Element

MEDIUM

10 mins

227 upvotes

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Problem

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K Largest Element

Contributed by

Prateek_18cb

Medium

0/80

Avg time to solve 10 mins

Success Rate 90 %

227 upvotes

Problem Statement

You are given an unsorted array containing ‘N’ integers. You need to find ‘K’ largest elements from the given array. Also, you need to return the elements in non-decreasing order.

Detailed explanation ( Input/output format, Notes, Constraints, Images )

Input Format:

The first line of the input contains an integer ‘T’ denoting the number of test cases.

The first line of each test case contains two space-separated positive integers ‘N’ and ‘K’ denoting the number of the elements present in the array and count of the largest elements you need to return as the answer respectively.

The second line of each test case contains ‘N’ space-separated integers denoting the elements of the array.

Output Format:

The only line of output of each test case should contain  ‘K’ largest elements in the array in non-decreasing order.

Print the output of each test case in a separate line.

Note:

You do not need to print anything, it has already been taken care of. Just implement the given function.

Follow Up:

Can you solve this in less than O(N*log(N)) time complexity?

Constraints:

1 <= T <= 100
1 <= N <= 10^4  
1<= K <= N  
-10^9 <= ARR[i] <= 10^9

Where ‘T’ is the number of test cases, ‘N’ is the size of the array, ‘K’ is the number of elements you need to return as an answer and ARR[i] is the size of the array of elements.

Time Limit: 1 sec

Sample Input 1:

Sample Output 1:

3 4
3

Explanation for sample input 1:

Test case 1:
If we sort the array then it will look like: [1, 2, 3, 4]. The 2 largest elements will be [3, 4].

Test case 2:
If we sort the array then it will look like: [1, 2, 2, 3, 3]. Then the largest element will be [3].

Sample Input 2:

2
5 5
0 10 1 2 2
6 2
-2 12 -1 1 20 1

Sample Output 2:

0 1 2 2 10
12 20

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