Google New Grad R1 Rejection: Recover the Original From a Doubled Array

Role: Software Engineer, New Grad / Early Career
Result: Rejected after R1
Report time: January 2026

Coding: doubled and shuffled array

Start with an original array, append every value multiplied by two, and shuffle the result.

Example:

• Original: [1, 4]
• After adding doubled values: [1, 4, 2, 8]
• Shuffled input: [2, 1, 4, 8]

Write the inverse function that recovers the original array. For the shuffled input above, return [1, 4].

The candidate identified the task as the same family as LeetCode 2007.

Practice: Find the Original Array From a Doubled Array

No technical follow-up or behavioral round was preserved in the source.