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Welcome to the Coding Problems wiki! Here's a list of Problems, solve it & raise a Pull Request.
#1 This problem was asked by Google.
Given a list of numbers and a number k, return whether any two numbers from the list add up to k.
For example, given [10, 15, 3, 7] and k of 17, return true since 10 + 7 is 17.
Bonus: Can you do this in one pass?