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Stack Coding Problems

LIFO data structure operations

172
Total Problems
23
Easy
97
Medium
51
Hard
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Master DSA Topics - January, 2026

Practice problems across 75+ categories

Stack Coding Problems

Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard

3407Google
3399Amazon
3344Microsoft
2900Meta
571Apple
275Facebook
51Netflix
31Uber
27LinkedIn
17Twitter
15Spotify
14Bloomberg
12Adobe
12Airbnb
11Instagram
9DoorDash
9Lyft
8Goldman Sachs
8Oracle
8ByteDance
# Problem Difficulty Topics
166 Using a Robot to Print the Lexicographically Smallest String Medium
Hash TableStringStack
167 Valid Parentheses Easy
StringStack
168 Valid Parenthesis String Medium
StringDynamic ProgrammingStack
169 Validate Stack Sequences Medium
ArrayStackSimulation
170 Verify Preorder Sequence in Binary Search Tree Medium
ArrayStackTree
171 Verify Preorder Serialization of a Binary Tree Medium
StringStackTree
172 Zuma Game Hard
StringDynamic ProgrammingStack
Showing 166-172 of 172
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public class MyFirstJavaProgram { Edit & Run

   /* This is my first java program.
    * This will print 'Hello, World!' as the output
    */

   public static void main(String []args) {
      System.out.println("Hello, World!"); // prints
   }
}

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