Design-1 PR-December 2025

[jose-rafael-marcano]

Adding two problems:

1- https://leetcode.com/problems/design-hashset
Class MyHashSet.java

2- https://leetcode.com/problems/min-stack/
Class MinStack.java

[super30admin]

Strengths:

• The student has correctly implemented both data structures with optimal time and space complexity.
• The code is clean, well-organized, and includes helpful comments.
• The use of lazy initialization for the inner arrays in MyHashSet is a good optimization.

Areas for Improvement:

• The comment in MyHashSet explaining the use of division for the second hash function is very detailed, but it could be slightly more concise while still being clear.
• The MinStack implementation could benefit from a brief comment explaining the logic behind pushing the old minimum when a new minimum is encountered.