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Design Coding Problems

Design data structures and systems

128
Total Problems
15
Easy
81
Medium
30
Hard
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Master DSA Topics - January, 2026

Practice problems across 75+ categories

Design Coding Problems

Practice problems frequently asked at Design • 128 problems | 15 Easy | 81 Medium | 30 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
121 Subrectangle Queries Medium
ArrayDesignMatrix
122 Throne Inheritance Medium
Hash TableTreeDepth-First Search
123 Time Based Key-Value Store Medium
Hash TableStringBinary Search
124 Tweet Counts Per Frequency Medium
Hash TableStringBinary Search
125 Two Sum III - Data structure design Easy
ArrayHash TableTwo Pointers
126 Unique Word Abbreviation Medium
ArrayHash TableString
127 Walking Robot Simulation II Medium
DesignSimulation
128 Zigzag Iterator Medium
ArrayDesignQueue
Showing 121-128 of 128
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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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