标签：
For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.
[3, 30, 34, 5, 9]
9534330
Note: The result may be very large, so you need to return a string instead of an integer.
179. Largest Number
原文地址：http://www.cnblogs.com/neweracoding/p/5430670.html
