LeetCode Q179: Largest Number

Given a list of non negative integers, arrange them such that they form the largest number.

For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.

Note: The result may be very large, so you need to return a string instead of an integer.

Solution:

Since we need to decide which number is in front of another for each pair of numbers, we could come up a new rule for comparison in sort function.