Stack Interview Questions

Master 23 stack problems frequently asked in technical interviews. These questions test your understanding of stackconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard

Minimum Remove to Make Valid Parentheses

Asked at Meta

String Stack

Rank

#232EasyFrequency: 100%

Implement Queue using Stacks

Asked at TikTok

Stack Design Queue

Rank

#716HardFrequency: 100%

Max Stack

Asked at LinkedIn

Linked List Stack Design Doubly-Linked List Ordered Set

Rank

#42HardFrequency: 100%

Trapping Rain Water

Asked at PayPal

Array Two Pointers Dynamic Programming Stack Monotonic Stack

Rank

#227MediumFrequency: 96%

Basic Calculator II

Asked at Meta

Math String Stack

Rank

#739MediumFrequency: 94%

Daily Temperatures

Asked at TikTok

Array Stack Monotonic Stack

Rank

#957MediumFrequency: 94%

Minimum Add to Make Parentheses Valid

Asked at PayPal

String Stack Greedy

Rank

#84HardFrequency: 93%

Largest Rectangle in Histogram

Asked at Infosys

Array Stack Monotonic Stack

Rank

#234EasyFrequency: 93%

Palindrome Linked List

Asked at Databricks

Linked List Two Pointers Stack Recursion

Rank

#20EasyFrequency: 90%

Valid Parentheses

Asked at Airbnb

String Stack

#10

Rank

#364MediumFrequency: 88%

Nested List Weight Sum II

Asked at LinkedIn

Stack Depth-First Search Breadth-First Search

#11

Rank

#394MediumFrequency: 87%

Decode String

Asked at Oracle

String Stack Recursion

#12

Rank

#173MediumFrequency: 75%

Binary Search Tree Iterator

Asked at Salesforce

Stack Tree Design Binary Search Tree Binary Tree Iterator

#13

Rank

#71MediumFrequency: 73%

Simplify Path

Asked at Meta

String Stack

#14

Rank

#758MediumFrequency: 64%

Convert Binary Search Tree to Sorted Doubly Linked List

Asked at Meta

Linked List Stack Tree Depth-First Search Binary Search Tree Binary Tree Doubly-Linked List

#15

Rank

#1909MediumFrequency: 64%

Buildings With an Ocean View

Asked at Meta

Array Stack Monotonic Stack

#16

Rank

#1737EasyFrequency: 59%

Maximum Nesting Depth of the Parentheses

Asked at Infosys

String Stack

#17

Rank

#224HardFrequency: 56%

Basic Calculator

Asked at Amazon

Math String Stack Recursion

#18

Rank

#155MediumFrequency: 55%

Min Stack

Asked at Microsoft

Stack Design

#19

Rank

#1128EasyFrequency: 55%

Remove All Adjacent Duplicates In String

Asked at Microsoft

String Stack

#20

Rank

#114MediumFrequency: 53%

Flatten Binary Tree to Linked List

Asked at Google

Linked List Stack Tree Depth-First Search Binary Tree

#21

Rank

#2021MediumFrequency: 43%

Remove All Occurrences of a Substring

Asked at PayPal

String Stack Simulation

#22

Rank

#735MediumFrequency: 37%

Asteroid Collision

Asked at Meta

Array Stack Simulation

#23

Rank

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Stack Interview Questions

Master 23 stack problems frequently asked in technical interviews. These questions test your understanding of stackconcepts and are essential for coding interview success.

Total Problems

Easy

Medium

Hard