JOBSEEKER?

Write a function that when passed an array and a target sum, returns, efficiently with respect to time used, two distinct zero-based indices of any two of the numbers whose sum is equal to the target sum. If there are no two numbers, the function should return nil.

For example, findTwoSum([ 3, 1, 5, 7, 5, 9 ], 10) should return a single dimensional array with two elements and contain any of the following pairs of indices:

  • 0 and 3 (or 3 and 0) as 3 + 7 = 10
  • 1 and 5 (or 5 and 1) as 1 + 9 = 10
  • 2 and 4 (or 4 and 2) as 5 + 5 = 10


  •   Example case: Wrong answer
  •   Distinct numbers with and without solutions: Wrong answer
  •   Duplicate numbers with and without solutions: Wrong answer
  •   Performance test with a large list of numbers: Wrong answer

Tags
Swift Algorithmic thinking Dictionary New Public
Easy

30min

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