706. Largest Number
Given an array of non-negative integers, arrange them in a way that produces the largest possible number.
The first line of the input should contain an integer n, which represents the size of the array. The second line should contain n space-separated integers, representing the elements of the array.
Print the string representation of the largest number.
5 3 30 34 5 9
`1 <= n <= 100000` The result may be very large, so it is necessary to return a string instead of an integer.