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9 questions

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CodingHardLeetCode 716
Max Stack
Design a stack data structure that supports standard push, pop, and top operations, along with a getMax operation that retrieves (but does not remove) the…
Companies: Confluent, Everpure, LinkedIn, Walmart Labs
Design · Doubly-Linked List · Linked List · Ordered Set
Last reported Oct 2026
Open workspace
CodingMediumLeetCode 1438
Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Find the length of the longest contiguous subarray whose maximum minus minimum is ≤ limit; the key challenge is maintaining the window's current min and…
Companies: MongoDB, Uber
Array · Heap (Priority Queue) · Monotonic Queue · Ordered Set
Last reported Apr 2026
Open workspace
CodingHardLeetCode 1912

Design Movie Rental System

Maintain dynamic collections to (1) return the cheapest up-to-5 shops that have an unrented copy of a given movie and (2) report the cheapest up-to-5…

Companies: Amazon, Okta

Array · Design · Hash Table · Heap (Priority Queue)

Last reported Sep 2024

CodingMediumLeetCode 456

132 Pattern

Determine whether the array contains indices i < j < k such that nums[i] < nums[k] < nums[j] (a "132" subsequence). With n up to…

Companies: DoorDash

Array · Binary Search · Monotonic Stack · Ordered Set

CodingHardLeetCode 3161

Block Placement Queries

Support inserting obstacles at points on the nonnegative number line and, for each query, determine whether there exists any obstacle-free interval of length >= sz…

Companies: Hudson River Trading, Roblox, TikTok

Array · Binary Indexed Tree · Binary Search · Ordered Set

CodingMediumLeetCode 3092

Most Frequent IDs

Given a sequence of ID updates where each step adds or removes a given number of copies of an ID, maintain the dynamic multiset of…

Companies: Snowflake

Array · Hash Table · Heap (Priority Queue) · Ordered Set

CodingHardLeetCode 2251

Number of Flowers in Full Bloom

Given a list of closed time intervals for when each flower is in full bloom and query times for people arriving, return for each person…

Companies: Roblox

Array · Binary Search · Hash Table · Ordered Set

CodingHardLeetCode 2035

Partition Array Into Two Arrays to Minimize Sum Difference

Partition the 2n integers into two equal-sized groups (choose n elements for one group) to minimize the absolute difference of their sums — a constrained…

Companies: Salesforce

Array · Binary Search · Bit Manipulation · Bitmask

CodingHardLeetCode 493

Reverse Pairs

Count the number of index pairs (i, j) with 0 ≤ i < j < n such that nums[i] > 2 * nums[j]; this is…

Companies: eBay

Array · Binary Indexed Tree · Binary Search · Divide and Conquer