DaleStudy/leetcode-study
Nov 2025 – Nov 2025
1 Month active
Languages Used
JavaScript
Technical Skills
JavaScriptJavaScript programmingalgorithm designalgorithm developmentdata structuresdepth-first search
JangAyeon
PROFILE
Jangayeon
Developed a reusable LeetCode practice library in the DaleStudy/leetcode-study repository, focusing on arrays, dynamic programming, strings, and tree/backtracking problems. Applied JavaScript to implement solutions for challenges such as Two Sum, product except self, and top-k frequent elements, while introducing bit-count utilities and optimizing the House Robber problem from depth-first search to iterative dynamic programming for improved performance. Built a dynamic programming suite covering climbing stairs, maximum subarray, and decode ways, and created efficient string utilities for anagram and palindrome validation. Emphasized clean, maintainable code and performance tuning, demonstrating strong skills in algorithm design and data structures.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
17Total
Bugs
0
Commits
17
Features
5
Lines of code
382
Activity Months1
Your Network
296 peopleSame Organization
@ewhain.net7
Work History
November 2025
17 Commits • 5 Features
Nov 1, 2025Month: 2025-11 | DaleStudy/leetcode-study Key features delivered: - Array and frequency utilities including bit counting: implemented multiple array problems (Two Sum, duplicates check, top-k frequent, longest consecutive sequence, product except self) and added a bit-count utility. Notable commits span two-sum solution, duplicates check, top-k frequent elements, longest consecutive sequence fix, product-of-array-except-self, and bit count utility. - House Robber optimization (DFS to DP): introduced DFS solution and refactored to iterative DP for efficiency, delivering faster runtimes for larger inputs. - Dynamic Programming Suite: DP practice problems including climbing stairs, maximum subarray, and decode ways to build a reusable DP toolkit. - String processing utilities: anagram check and palindrome validation utilities implemented with efficient techniques (sliding window and hashing). - Tree and Backtracking problems: BST validation, combination-sum (DFS), and 3Sum explored to strengthen backtracking patterns and correctness. Major bugs fixed: - Resolved timeout in the longest consecutive sequence by switching from a naive approach to an efficient DP-based solution, significantly improving worst-case performance. - Implemented correctness and performance refinements across DP problems and string utilities to reduce edge-case failures and improve reliability. Overall impact and accomplishments: - Delivered a versatile, reusable LeetCode practice library covering arrays, DP, strings, and trees/backtracking, accelerating problem solving and onboarding for future work. - Demonstrated end-to-end capability from analysis and algorithm design to implementation and performance tuning, with concrete commit-backed deliveries. - Established design patterns for DP, DFS-to-DP refactors, and utility modules that can be composed for new problems. Technologies/skills demonstrated: - Algorithm design and optimization (DP, sliding window, two-pointer, hash maps, bit manipulation) - Data structures: arrays, hash-based frequency counts, trees, and backtracking search - Language-agnostic algorithm implementation with a focus on clean, maintainable code and readability - Performance awareness: explicit focus on runtime improvements and timeout fixes
17 Commits • 5 Features
Nov 1, 2025Month: 2025-11 | DaleStudy/leetcode-study Key features delivered: - Array and frequency utilities including bit counting: implemented multiple array problems (Two Sum, duplicates check, top-k frequent, longest consecutive sequence, product except self) and added a bit-count utility. Notable commits span two-sum solution, duplicates check, top-k frequent elements, longest consecutive sequence fix, product-of-array-except-self, and bit count utility. - House Robber optimization (DFS to DP): introduced DFS solution and refactored to iterative DP for efficiency, delivering faster runtimes for larger inputs. - Dynamic Programming Suite: DP practice problems including climbing stairs, maximum subarray, and decode ways to build a reusable DP toolkit. - String processing utilities: anagram check and palindrome validation utilities implemented with efficient techniques (sliding window and hashing). - Tree and Backtracking problems: BST validation, combination-sum (DFS), and 3Sum explored to strengthen backtracking patterns and correctness. Major bugs fixed: - Resolved timeout in the longest consecutive sequence by switching from a naive approach to an efficient DP-based solution, significantly improving worst-case performance. - Implemented correctness and performance refinements across DP problems and string utilities to reduce edge-case failures and improve reliability. Overall impact and accomplishments: - Delivered a versatile, reusable LeetCode practice library covering arrays, DP, strings, and trees/backtracking, accelerating problem solving and onboarding for future work. - Demonstrated end-to-end capability from analysis and algorithm design to implementation and performance tuning, with concrete commit-backed deliveries. - Established design patterns for DP, DFS-to-DP refactors, and utility modules that can be composed for new problems. Technologies/skills demonstrated: - Algorithm design and optimization (DP, sliding window, two-pointer, hash maps, bit manipulation) - Data structures: arrays, hash-based frequency counts, trees, and backtracking search - Language-agnostic algorithm implementation with a focus on clean, maintainable code and readability - Performance awareness: explicit focus on runtime improvements and timeout fixes
November 2025
Activity
Loading activity data...
Quality Metrics
Correctness97.6%
Maintainability88.2%
Architecture88.2%
Performance88.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaScript
Technical Skills
JavaScriptJavaScript programmingalgorithm designalgorithm developmentdata structuresdepth-first searchdynamic programmingproblem solvingstring manipulationtree data structures
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline