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Two numbers with sum closest to zero
Medium Accuracy: 23.71% Submissions: 1399 Points: 4

Given an integer array of N elements. You need to find the sum of two elements such that sum is closest to zero.

Example 1:

Input:
N = 3
arr[] = {-8 -66 -60}
Output: -68
Explanation: Sum of two elements closest to
zero is -68 using numbers -60 and -8.


â€‹Example 2:

Input:
N = 6
arr[] = {-21 -67 -37 -18 4 -65}
Output: -14
Explanation: Sum of two elements closest to
zero is -14 using numbers -18 and 4.

You don't need to read input or print anything. You just need to complete the function closestToZero() which takes an array arr[] and its size n as inputs and returns the sum closest to zero that can be formed by summing any two elements in the array.

Expected Time Complexity: O(NlogN).
Expected Auxiliary Space: O(1).

Constraints:
1 ≤ N ≤ 103
-106 ≤ a[i] ≤ 106

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