Meta E4 SWE Infra Full Loop

Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. The problem description can be found at the provided LeetCode link. No variations were mentioned.

The problem was phrased as "Software Packages Install Order". The core problem is equivalent to LeetCode 207. Course Schedule, where you are given a total number of courses you have to take, labeled from 0 to numCourses - 1, and an array of prerequisites where prerequisites[i] = [ai, bi] indicates that you must take course bi first if you want to take course ai. Return true if you can finish all courses, otherwise false. The full problem description can be found at the provided LeetCode link.

Typical behavioral questions were asked, including: "What project are you most proud of?", "Tell me about a time you had a conflict with a coworker?", and "You mentioned you are interested in X topic, what are some experiences you have with that?". The interview felt conversational.

Design a system like Netflix. The interviewer focused on tradeoffs and clarifications ("what tradeoffs", "I don't understand", "are there any other considerations you wish to talk about?").

Given an integer array nums and an integer k, return the kth largest element in the array. Note that it is the kth largest element in the sorted order, not the kth distinct element. No variant was mentioned. The problem description can be found at the provided LeetCode link.

The problem was a variation of LeetCode 543. Diameter of Binary Tree. Instead of counting the number of edges in the diameter, I had to count the number of nodes. The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or may not pass through the root. The full problem description for the original problem can be found at the provided LeetCode link.

Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. Find the total sum of all root-to-leaf numbers. No variant was mentioned for the core problem. Follow-up questions included "how 0 would be handled" (no change needed) and "What if result and/or current number is too big to fit into any size integer?". The problem description can be found at the provided LeetCode link.

Given a reference to a node in a circularly sorted linked list, insert a new element insertVal into the list such that it remains a circularly sorted list. The new node should be inserted such that the list remains sorted. If there are multiple valid places to insert, any of them is fine. We need to return the pointer to the newly inserted node. No variant was mentioned. The interviewer asked a lot of follow-ups about edge cases and how the solution would handle them. The problem description can be found at the provided LeetCode link.

Design a leaderboard for a gaming platform with user scores. Users should be able to see a global leaderboard, a leaderboard of their friends, and their own position in the leaderboard along with 10 people above and below them.