Oracle Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
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Implement Queue Operations Using Two Stacks
Implement Queue Operations Using Two Stacks Process a sequence of queue operations using exactly two LIFO stacks as the queue's internal data structur...
Count Requests Dropped by Multiple Time Windows
Count Requests Dropped by Multiple Time Windows Implement count_dropped(timestamps) for nondecreasing integer seconds. For zero-based request index i,...
Keep At Most K Copies in a Sorted Array
Keep At Most K Copies in a Sorted Array Implement dedupe_sorted(nums, k). Modify the sorted input array in place so each distinct integer appears at m...
Compress Consecutive Characters with Run Lengths
Compress Consecutive Characters with Run Lengths Implement compress_runs(s) and return the compressed string. The input contains ASCII letters only. S...
Maximize Profit with One Stock Transaction
Maximize Profit with One Stock Transaction Implement max_profit(prices) for daily integer prices. Choose at most one buy followed by one later sell an...
Implement in-memory data structures and booking API
This question evaluates proficiency in data structures and algorithms, systems-level data modeling, and practical API design by testing in-memory key-...
Implement an LRU cache
Design and implement a data structure for a Least Recently Used (LRU) cache with a fixed capacity. The cache must support: - get(key): return the valu...
Count anagram-based replacements per phrase
Problem You are given: - phrases: a list of strings, where each string is a phrase containing words separated by single spaces. - words: a list of str...
Return a valid course completion order
You are given an integer n representing n courses labeled 0..n-1 and a list of prerequisite pairs prerequisites, where each pair [a, b] means you must...
Solve three DSA problems: trie, window, intervals
1) Design and implement an autocomplete service. Support insert(word) to add a word and suggest(prefix) to return up to five existing words that start...
Maximize area between vertical lines
This question evaluates algorithmic reasoning with arrays and the ability to optimize pairwise measurements, specifically assessing understanding of h...
Compute letter frequencies from encoded string
Problem You are given an encoded string s representing a string of lowercase English letters (a–z). The encoding follows these rules: 1. Letters a to ...
Solve Five Coding Problems
This problem set evaluates proficiency in core algorithms and data structures, including graph traversal and connected-component identification, array...
Find users with at least one valid session
You are given: - A list of log entries logs, where each entry is a string in the format: ` "userId action timestamp" ` - userId is a non...
Count closed islands in a grid
This question evaluates grid traversal and connected-component detection skills, focusing on 4-directional adjacency and boundary-condition reasoning ...
Count Closed Islands
This question evaluates a candidate's understanding of grid-based connectivity and the ability to detect enclosed regions, testing skills in graph rep...
Minimize sum with halving operations
Minimize sum with halving operations You are given an array of non-negative integers nums and an integer k. In one operation, choose any index i and r...
Count Interior Islands After Flooding
You are given an m x n binary grid representing land and water. - 1 = land - 0 = water An island is a maximal group of land cells connected 4-directio...
Count Enclosed Islands in a Grid
This question evaluates grid traversal and graph concepts such as connected-component detection, boundary-condition reasoning, and algorithmic time/sp...
Implement an LRU cache
Design and implement an in-memory cache that evicts entries using the Least Recently Used (LRU) policy. The cache should store key–value pairs and sup...