2020/08/18/README.md


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│   Given a list of numbers, where every number shows up twice except for
│   one number, find that one number.
│   Example:
│Input: [4, 3, 2, 4, 1, 3, 2]
│Output: 1
│
│   Here's the function signature:
│def singleNumber(nums):
│  # Fill this in.
│print singleNumber([4, 3, 2, 4, 1, 3, 2])
│# 1
│
│   Challenge: Find a way to do this using O(1) memory.