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Coding exam

The coding exam sets three timed problems in the language a job asks for, answered in a full editor with both the camera and the shared screen recording. Below is that screen, working, with a guided walkthrough of every part of it.

Guided walkthrough13 steps · about three minutes

Python exam for Senior Backend Engineer

Question 1: Given a list of integers and a target, return the two numbers that add up to that target. Each input has exactly one answer, and the same element may not be used twice. Return the pair as a list, smaller number first.

Example 1:

Input: nums = [2, 7, 11, 15], target = 9 Output: [2, 7]

Example 2:

Input: nums = [3, 2, 4], target = 6 Output: [2, 4]

Less

0:38:12

main.py

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def two_sum(nums, target):
    seen = {}

    for index, value in enumerate(nums):
        # the number that would complete the pair
        needed = target - value

        if needed in seen:
            return sorted([needed, value])

        seen[value] = index


print(two_sum([2, 7, 11, 15], 9))

Output:

A working replica of the real screen — nothing here is recorded or submitted.
It is built for a desktop screen, so on a narrow window it pans sideways rather than reflowing.