PRACTICE

Stack Interview Questions

32 Stack problems asked across FAANG and top tech companies. Approach hints, optimal solutions, and related problems.

Ready to try these in a real interview?

I'm Alex. I'll interview you on 2 problems like these at your level, ask follow-ups, and give you a scored report.

Start mock with Alex
🔒

to save your progress.

Companies

Topics

Stack 32
StackClear all
42.Trapping Rain Water
ArrayTwo PointersStack
Hard+6▶ Mock
20.Valid Parentheses
StackString
Easy+3▶ Mock
739.Daily Temperatures
StackArray
Medium+4▶ Mock
341.Flatten Nested List Iterator
StackTreeDepth-First Search
Medium▶ Mock
735.Asteroid Collision
ArrayStackSimulation
Medium+1▶ Mock
155.Min Stack
StackDesign
Medium▶ Mock
503.Next Greater Element II
ArrayStackMonotonic Stack
Medium▶ Mock
227.Basic Calculator II
MathStringStack
Medium▶ Mock
1966.Binary Searchable Numbers in an Unsorted Array
ArrayBinary SearchStack
Medium▶ Mock
94.Binary Tree Inorder Traversal
StackTreeDepth-First Search
Easy▶ Mock
144.Binary Tree Preorder Traversal
StackTreeDepth-First Search
Easy▶ Mock
2296.Design a Text Editor
Linked ListStringStack
Hard▶ Mock
636.Exclusive Time of Functions
ArrayStack
Medium▶ Mock
1475.Final Prices With a Special Discount in a Shop
ArrayStackMonotonic Stack
Easy▶ Mock
32.Longest Valid Parentheses
StringDynamic ProgrammingStack
Hard▶ Mock
84.Largest Rectangle in Histogram
ArrayStackMonotonic Stack
Hard▶ Mock
1249.Minimum Remove to Make Valid Parentheses
StringStack
Medium▶ Mock
1209.Remove All Adjacent Duplicates in String II
StringStack
Medium▶ Mock
402.Remove K Digits
StringStackGreedy
Medium▶ Mock
716.Max Stack
Linked ListStackDesign
Hard▶ Mock
1944.Number of Visible People in a Queue
ArrayStackMonotonic Stack
Hard▶ Mock
678.Valid Parenthesis String
StringDynamic ProgrammingStack
Medium▶ Mock
71.Simplify Path
StringStack
Medium▶ Mock
2434.Using a Robot to Print the Lexicographically Smallest String
Hash TableStringStack
Medium▶ Mock
272.Closest Binary Search Tree Value II
Two PointersStackTree
Hard▶ Mock
364.Nested List Weight Sum II
StackDepth-First SearchBreadth-First Search
Medium▶ Mock
394.Decode String
StringStackRecursion
Medium▶ Mock
445.Add Two Numbers II
Linked ListMathStack
Medium▶ Mock
496.Next Greater Element I
ArrayHash TableStack
Easy▶ Mock
853.Car Fleet
ArrayStackSorting
Medium▶ Mock
1762.Buildings With an Ocean View
ArrayStackMonotonic Stack
Medium▶ Mock
1963.Minimum Number of Swaps to Make the String Balanced
Two PointersStringStack
Medium▶ Mock

Practice with a Mock Interview

Solve these Stack problems under real interview pressure with our AI interviewer.

Start Mock Interview →