Fourth Largest Element in the Array

Posted: 19 Jul, 2020
Difficulty: Easy

PROBLEM STATEMENT

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You are given an array consisting of 'N' integers. You have to find the fourth largest element present in the array.

If there is no such number present in the array, then print the minimum value of an integer which is -2147483648.

Follow Up:
Try solving this problem in O(N) time complexity.
Input format:
The first line of input contains the integer 'N' representing the size of the array.

The second line of input contains N space-separated integers representing the array elements.
Output Format:
The only output line contains the fourth-largest element if present, otherwise print -2147483648
Note:
You are not required to explicitly print the output, it has already been taken care of. Just implement the function.
Constraints :
1 <= N < 10^6
-10^6 <= element <= 10^6

Time Limit: 1 sec
Approach 1

We can find the 4th largest element by simply sorting the list, and returning the 4th element from the end.

 

Algorithm:

 

  • Sort the array in non-decreasing order
  • Return the fourth largest element
  • If the array has less than 4 elements, you can return the minimum integer value
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