Daily Interview Problem: Merge List Of Number Into Ranges

Hi, here's your problem today. This problem was recently asked by Facebook:

Given a sorted list of numbers, return a list of strings that represent all of the consecutive numbers.

Example:
Input: [0, 1, 2, 5, 7, 8, 9, 9, 10, 11, 15]
Output: ['0->2', '5->5', '7->11', '15->15']
Assume that all numbers will be greater than or equal to 0, and each element can repeat.

Here is a starting point:

def findRanges(nums):

  # Fill this in.



print findRanges([0, 1, 2, 5, 7, 8, 9, 9, 10, 11, 15])

# ['0->2', '5->5', '7->11', '15->15']