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Interview questions by company and topic | SysRound

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9 questions

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CodingHardLeetCode 588
Design In-Memory File System
Design an in-memory hierarchical file system that supports path parsing and operations like mkdir, ls, addContentToFile (append/create), and readContentFromFile, requiring you…
Companies: Anchorage Digital, Capital One, Coupang, Datadog +5
Design · Hash Table · Sorting · String
Last reported Nov 2026
Open workspace
CodingMediumLeetCode 692
Top K Frequent Words
Count word frequencies and return the k most frequent words sorted by descending frequency, breaking ties by lexicographical order. The core challenge is combining frequency…
Companies: Apple, Microsoft, Oracle, Robinhood
Array · Bucket Sort · Counting · Hash Table
Last reported Oct 2026
Open workspace
CodingMediumLeetCode 139
Word Break

Determine whether the string s can be segmented into a sequence of one or more words from wordDict (words may be reused). The core challenge…

Companies: Amazon, Google, Grammarly, Meta +3

Array · Brute-Force Search · Dynamic Programming · Hash Table

Last reported Sep 2026

CodingMediumLeetCode 3076

Shortest Uncommon Substring in an Array

For each string in an array, find the shortest substring that does not occur in any other string (choose the lexicographically smallest one among ties)…

Companies: Airbnb

Array · Hash Table · String · Trie

Last reported Sep 2026

CodingHardLeetCode 140

Word Break II

Given a string s and a word dictionary, return all possible sentences formed by inserting spaces so every token is a dictionary word — i.e.…

Companies: Bloomberg, Meta, ServiceNow

Array · Backtracking · Dynamic Programming · Hash Table

Last reported Aug 2026

CodingEasyLeetCode 14

Longest Common Prefix

Return the longest prefix string common to all strings in the array, or an empty string if none exists. The task reduces to comparing characters…

Companies: Amazon, Apple, Bloomberg, Google +3

Array · String · Trie

Last reported Jun 2026

CodingHardLeetCode 212

Word Search II

Given an m×n letter grid and a list of words, find all words that can be formed by sequentially adjacent (horizontal/vertical) non-repeating cells. The core…

Companies: Amazon, Bloomberg, Glean, Google +2

Array · Backtracking · Matrix · String

Last reported Jun 2026

CodingHardLeetCode 642

Design Search Autocomplete System

Design an online autocomplete system that processes characters one-by-one, returning the top 3 historically most frequent sentences that match the current prefix (ranked by…

Companies: Google, Netflix, Pinterest, Vercel

Data Stream · Depth-First Search · Design · Heap (Priority Queue)

Last reported May 2026

CodingHardLeetCode 2227

Encrypt and Decrypt Strings

Implement an Encrypter that maps each character to a two-letter code and supports encrypting by replacing characters and decrypting by counting how many dictionary words…

Companies: Duolingo

Array · Design · Hash Table · String