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Two Number Sum

Description

Given a list of numbers and a number sum, return whether any two numbers from the list add up to sum.

Business Rules/Errata

  • Numbers may be positive or negative integers, or 0.
  • The list of numbers may contain fewer than two numbers, in which case your function should return False.
  • Bonus Challenge: Identify the efficiency (time and memory) of your solution. Can you do better?

Examples

two_number_sum(17, [10, 15, 3, 7])  // true
two_number_sum(17, [10, 15, 3, 8])  // false
two_number_sum(16, [10, 15, 8, 7])  // false
two_number_sum(16, [10, 15, 8, 8])  // true
two_number_sum(32, [])              // false
two_number_sum(32, [32])            // false
two_number_sum(32, [32, 0])         // true
two_number_sum(-32, [32, 0])        // false
two_number_sum(-32, [32, -64])      // true

Tackling This Challenge

  1. Make sure you've got the required software on your machine: .NET Core 3.0+ and a text editor.
  2. If you haven't already, fork the CodingDojo repository (INSTRUCTIONS).
  3. The challenge will be live-coded in our monthly Tuesday meetup.
  4. Run the tests to check your solution by navigating to this directory and running ./run-tests.
  5. The results of the live coding demo will be added to the GitHub repository as a mob solution. Please feel free to tackle this challenge in your own way/language and submit your solution to the repo using this solutions guide in our wiki.

Requirements

  • .NET Core 3.0+