completed design-1#2678
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Pull request overview
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Adds Java implementations for two LeetCode data-structure problems (Design HashSet and Design MinStack) and fixes a README formatting issue.
Changes:
- Added
MyHashSetimplementation using 2D boolean bucketing. - Added
MinStackimplementation using two stacks to track minimum values. - Updated README markdown for “Problem 2” header formatting.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| design_hashset.java | New MyHashSet implementation with bucket/position hashing. |
| MinStack.java | New MinStack implementation with min-tracking stack. |
| README.md | Fixes markdown header formatting for Problem 2. |
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| public MyHashSet() { | ||
| this.buckets = 1000; | ||
| this.bucketItems = 1001; | ||
| this.storage = new boolean[buckets][]; | ||
| } | ||
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| private int hash(int key) { | ||
| return key % buckets; | ||
| } | ||
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| private int pos(int key) { | ||
| return key / buckets; | ||
| } |
| this.buckets = 1000; | ||
| this.bucketItems = 1001; |
| import java.util.Stack; | ||
| class MinStack | ||
| { | ||
| private Stack<Integer> stack; | ||
| private Stack<Integer> minStack; |
| public void pop() | ||
| { | ||
| stack.pop(); | ||
| minStack.pop(); | ||
| } | ||
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| public int top() | ||
| { | ||
| return stack.peek(); | ||
| } | ||
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| public int getMin() | ||
| { | ||
| return minStack.peek(); | ||
| } |
Implement Hash Set (MinStack.java)
VERDICT: NEEDS_IMPROVEMENT Implement Min Stack (README.md)The student has not submitted any code for the MinStack problem. To receive credit, the student needs to:
The reference solution demonstrates a correct approach using two stacks - one for the main stack and one to track minimum values. This is a standard and efficient solution that achieves O(1) time for all operations. Since no code was provided, I cannot evaluate correctness, time/space complexity, code quality, or efficiency. The student should review the problem requirements and submit a working implementation. VERDICT: NEEDS_IMPROVEMENT |
No description provided.