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Interview questions by company and topic | SysRound

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10 questions

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CodingHardLeetCode 42
Trapping Rain Water
Given an array of non-negative heights representing elevation bars of width 1, compute the total units of water that can be trapped between them after…
Companies: Amazon, Bloomberg, Goldman Sachs, Google +6
Array · Dynamic Programming · Monotonic Stack · Stack
Last reported Oct 2026
Open workspace
CodingEasyLeetCode 1475
Final Prices With a Special Discount in a Shop
For each price, compute the final cost as price minus the first subsequent price to its right that is <= it (or the same price…
Companies: Uber, Walmart
Array · Monotonic Stack · Stack
Last reported Aug 2026
Open workspace
CodingEasyLeetCode 496
Next Greater Element I

Given nums1 as a subset of nums2, for each element in nums1 return the first greater element that appears to its right in nums2 (or…

Companies: Flipkart, Microsoft

Array · Hash Table · Monotonic Stack · Stack

Last reported Jun 2026

CodingMediumLeetCode 1762

Buildings With an Ocean View

Given an array of building heights, return the indices of buildings that have an unobstructed view to the ocean on the right (i.e., no building…

Companies: Anduril, Meta

Array · Monotonic Stack · Stack

Last reported Apr 2026

CodingMediumLeetCode 2866

Beautiful Towers II

Choose heights within [1, maxHeights[i]] that form a mountain (nondecreasing to a single peak then nonincreasing) to maximize the total sum. Core challenge: for each…

Companies: Bloomberg, Expedia

Array · Monotonic Stack · Stack

Last reported Sep 2025

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

CodingMediumLeetCode 1966

Binary Searchable Numbers in an Unsorted Array

Given an unsorted array, count the elements that are "binary searchable" — values that would be found by standard binary search without sorting, meaning every…

Companies: Uber

Array · Binary Search · Monotonic Stack · Stack

CodingMediumLeetCode 739

Daily Temperatures

For each day in an array of daily temperatures, determine how many days you must wait until a warmer temperature appears (or 0 if none)…

Companies: Anduril, Chime, Goldman Sachs

Array · Monotonic Stack · Stack

CodingHardLeetCode 84

Largest Rectangle in Histogram

Find the maximum area of a rectangle formed by contiguous bars in a histogram (given bar heights). The core challenge is determining each bar's maximal…

Companies: Bloomberg, Microsoft

Array · Monotonic Stack · Range Minimum/Maximum Query · Stack

CodingMediumLeetCode 316

Remove Duplicate Letters

Remove duplicate letters from s so each character appears exactly once and the resulting string is the smallest possible in lexicographic order. This is solved…

Companies: TikTok

Greedy · Monotonic Stack · Stack · String