Largest Number formed from an Array
Medium Accuracy: 28.93% Submissions: 2189 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:

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:

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

Your Task:  
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)

1 ≤ N ≤ 105
0 ≤ Arr[i] ≤ 1018


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