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Largest Number formed from an Array
Medium Accuracy: 25.65% Submissions: 5232 Points: 4

Given a list of non negative integers, arrange them in such a manner that they form the largest number possible.The result is going to be very large, hence return the result in the form of a string.

Example 1:

Input:
N = 5
Arr[] = {3, 30, 34, 5, 9}
Output: 9534330
Explanation: Given numbers are {3, 30, 34,
5, 9}, the arrangement 9534330 gives the
largest value.

Example 2:

Input:
N = 4
Arr[] = {54, 546, 548, 60}
Output: 6054854654
Explanation: Given numbers are {54, 546,
548, 60}, the arrangement 6054854654
gives the largest value.

You don't need to read input or print anything. Your task is to complete the function printLargest() which takes the array of strings arr[] as parameter and returns a string denoting the answer.

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

Constraints:
1 ≤ N ≤ 105
0 ≤ Arr[i] ≤ 1018