MongoDB Interview Questions

Find the common elements present in two given arrays. Return an array containing these intersecting elements, ensuring each element appears only once.

Given a sequence of words and a line width, format the text to fit within the specified width. You must justify the text, distributing extra spaces evenly between words.

Determine if a given string can be segmented into a space-separated sequence of words from a dictionary. You are given a string and a dictionary of words; can you break the string down using words from the dictionary?

Implement a multithreaded web crawler to efficiently explore and retrieve pages from a website, respecting the website's rules.

Track and query the fluctuating price of a stock. You need to efficiently find the latest price and the highest price recorded so far.

You are given two binary trees. Merge them into a new binary tree where nodes at the same position are summed; if only one tree has a node in a position, use its value.

You are given a sorted list of non-overlapping intervals and a new interval. Your task is to insert the new interval into the list, merging if necessary, and return the updated list of intervals.

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

You are given k sorted lists. Combine all of their elements into a single sorted list and return it.

You're given a string that represents a JSON object. Your task is to parse this string and convert it into a usable object or data structure within your programming language.

Find the lowest common ancestor of two nodes in a given binary tree. The lowest common ancestor is defined as the farthest node from the root that is an ancestor of both nodes.

Find the maximum value within each sliding window of a given size as it moves across an array.

Design a hit counter that records hits and retrieves the number of hits in the past 5 minutes. You need to implement methods to record a hit and get the total hits in a sliding window.

Design a data structure that efficiently stores a set of strings and allows for prefix-based searches. Implement methods to insert strings, search for complete words, and check if any word starts with a given prefix.

Design a search autocomplete system that suggests relevant sentences based on user input. You'll need to store sentences and their frequencies to provide ranked suggestions as the user types.

You're given a sorted array that has been rotated, and a target value. Find the index of the target value in the rotated array, or return -1 if it's not present.