I interviewed on February 16, 2021, for the London office.

It was a 45-minute interview online on Codepad. The first 2 minutes were an introduction of ourselves between the interviewer and myself.

Then, the interviewer asked me two questions.

The first was easier, but the second was harder and needed some time to grasp.

I ran out of time at the end, so I couldn't finish the second question.

Tip: Be fast and efficient.

The first question was about lists and finding the closest points in the xy plane to the origin.

The second question was to represent a binary tree using a doubly linked list, as traversed by an inorder traversal through the tree.