Problem-solve-study/code-store
Jan 2025 – Sep 2025
9 Months active
Languages Used
JavaMarkdown
Technical Skills
AlgorithmAlgorithm DesignAlgorithm ImplementationBacktrackingBreadth First SearchCombinatorics
한성민
PROFILE
한성민
Over nine months, this developer delivered a robust suite of algorithmic solutions in the Problem-solve-study/code-store repository, focusing on competitive programming challenges. They engineered over 220 features, applying advanced techniques in Java such as dynamic programming, graph traversal, and data structure optimization. Their approach emphasized modular, reusable code with clear separation between logic and I/O, and included enhancements for performance, maintainability, and onboarding documentation. The developer consistently applied iterative problem-solving, sorting algorithms, and parity-based logic, producing clean, review-ready code. Their work demonstrated depth in algorithm design and implementation, expanding the repository’s coverage and supporting efficient, scalable problem-solving workflows.
Overall Statistics
Feature vs Bugs
98%Features
Repository Contributions
315Total
Bugs
4
Commits
315
Features
222
Lines of code
18,730
Activity Months9
Your Network
1016 people
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025: Delivered a Java solution for Baekjoon problem 19539 in the code-store repository. Implemented parity-based logic to count odd/even numbers and determine whether the set can be reduced to zero, producing YES/NO as required. The implementation is committed (hash 10294150cdc5c1d3832074cbadcbed275b6d81d8). No major bugs fixed this month; this work enhances the repository's coverage of competitive programming problems and serves as a reusable pattern for parity-based problem solving. Demonstrated strong Java programming skills, problem decomposition, and clean code with a focused commit.
1 Commits • 1 Features
Sep 1, 2025September 2025: Delivered a Java solution for Baekjoon problem 19539 in the code-store repository. Implemented parity-based logic to count odd/even numbers and determine whether the set can be reduced to zero, producing YES/NO as required. The implementation is committed (hash 10294150cdc5c1d3832074cbadcbed275b6d81d8). No major bugs fixed this month; this work enhances the repository's coverage of competitive programming problems and serves as a reusable pattern for parity-based problem solving. Demonstrated strong Java programming skills, problem decomposition, and clean code with a focused commit.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08: Focused feature delivery in Problem-solve-study/code-store. Key feature: Implemented BOJ 14469 Earliest Completion Time Solver (Java) using sorting by arrival times and an iterative calculation to determine earliest completion times. This work improves automated problem-solving capabilities and provides a reusable scheduling component for future problems. No major bugs reported this month; commits added with focused changes. Overall impact: enhances competitiveness readiness by delivering a reliable, easily reusable algorithm and clean Java implementation. Technologies/skills demonstrated: Java, sorting algorithms, iterative problem-solving, clean commit practices, and repository organization.
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08: Focused feature delivery in Problem-solve-study/code-store. Key feature: Implemented BOJ 14469 Earliest Completion Time Solver (Java) using sorting by arrival times and an iterative calculation to determine earliest completion times. This work improves automated problem-solving capabilities and provides a reusable scheduling component for future problems. No major bugs reported this month; commits added with focused changes. Overall impact: enhances competitiveness readiness by delivering a reliable, easily reusable algorithm and clean Java implementation. Technologies/skills demonstrated: Java, sorting algorithms, iterative problem-solving, clean commit practices, and repository organization.
July 2025
13 Commits • 13 Features
Jul 1, 2025July 2025 — Problem-solve-study/code-store (monthly performance review). This month, the team delivered a comprehensive set of algorithmic solutions across multiple BOJ problems, established reusable scaffolding, and strengthened robustness and maintainability. Work focused on end-to-end problem-solving—from understanding constraints to implementing correct, edge-case-aware solutions and clear commit history. The following outcomes illustrate the breadth of delivery and business value achieved.
13 Commits • 13 Features
Jul 1, 2025July 2025 — Problem-solve-study/code-store (monthly performance review). This month, the team delivered a comprehensive set of algorithmic solutions across multiple BOJ problems, established reusable scaffolding, and strengthened robustness and maintainability. Work focused on end-to-end problem-solving—from understanding constraints to implementing correct, edge-case-aware solutions and clear commit history. The following outcomes illustrate the breadth of delivery and business value achieved.
July 2025
June 2025
34 Commits • 34 Features
Jun 1, 2025June 2025 monthly summary for Problem-solve-study/code-store. Delivered extensive feature work across BOJ problem solutions and repository documentation updates, expanding practical problem-solving coverage and improving repository usefulness. Work centered on batch-driven development (0512–0608), with a strong emphasis on code quality, consistent commit hygiene, and clearer traceability for future contributions.
June 2025
34 Commits • 34 Features
Jun 1, 2025June 2025 monthly summary for Problem-solve-study/code-store. Delivered extensive feature work across BOJ problem solutions and repository documentation updates, expanding practical problem-solving coverage and improving repository usefulness. Work centered on batch-driven development (0512–0608), with a strong emphasis on code quality, consistent commit hygiene, and clearer traceability for future contributions.
May 2025
55 Commits • 25 Features
May 1, 2025May 2025 monthly summary for Problem-solve-study/code-store: Delivered extensive end-to-end BOJ problem-solving coverage across multiple batches (0501–0520) for both E and N variants, with a strong emphasis on feature delivery, documentation, and maintainability. Implemented and integrated numerous problem solutions across batches, and enhanced the repository with comprehensive problem documentation.
55 Commits • 25 Features
May 1, 2025May 2025 monthly summary for Problem-solve-study/code-store: Delivered extensive end-to-end BOJ problem-solving coverage across multiple batches (0501–0520) for both E and N variants, with a strong emphasis on feature delivery, documentation, and maintainability. Implemented and integrated numerous problem solutions across batches, and enhanced the repository with comprehensive problem documentation.
May 2025
April 2025
67 Commits • 43 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for Problem-solve-study/code-store: Delivered extensive BOJ problem-solving capability across 0401–0415 with N/E variants, plus large-scale batch work (0408–0414). Key features include implemented solutions for notable problems such as BOJ 16565 N포커, 1303 전쟁-전투, 2099 The game of death, 14395 4연산, 2572 보드게임, 1764 듣보잡, 2302 극장 좌석, 17408 수열과 쿼리 24, and others; also completed initial work for 0414 E (10971) and fixed missing code for 0414 H (BOJ 2983). In addition, memory and time improvements were added for BOJ 7894 큰 수, and a refactor of BOJ 21922 improved readability and maintainability. Documentation updates for 오늘의 문제 were included to improve onboarding and problem tracking. A bug fix and refactor were completed as part of the batch coverage, and comprehensive docs were updated to reflect the batch 0408–0414 and daily problem updates. Overall, this work increased problem-solving coverage, improved code quality, and accelerated delivery of algorithmic solutions for the team and onboarding.
April 2025
67 Commits • 43 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for Problem-solve-study/code-store: Delivered extensive BOJ problem-solving capability across 0401–0415 with N/E variants, plus large-scale batch work (0408–0414). Key features include implemented solutions for notable problems such as BOJ 16565 N포커, 1303 전쟁-전투, 2099 The game of death, 14395 4연산, 2572 보드게임, 1764 듣보잡, 2302 극장 좌석, 17408 수열과 쿼리 24, and others; also completed initial work for 0414 E (10971) and fixed missing code for 0414 H (BOJ 2983). In addition, memory and time improvements were added for BOJ 7894 큰 수, and a refactor of BOJ 21922 improved readability and maintainability. Documentation updates for 오늘의 문제 were included to improve onboarding and problem tracking. A bug fix and refactor were completed as part of the batch coverage, and comprehensive docs were updated to reflect the batch 0408–0414 and daily problem updates. Overall, this work increased problem-solving coverage, improved code quality, and accelerated delivery of algorithmic solutions for the team and onboarding.
March 2025
59 Commits • 43 Features
Mar 1, 2025March 2025 summary for Problem-solve-study/code-store: Expanded the repository’s problem-solving coverage with a strong emphasis on BOJ problems, enhanced code quality, and improved workflow reliability. Batch 1 of 2025-03 BOJ problems delivered, followed by broad month-long contributions across multiple problem sets and algorithmic domains.
59 Commits • 43 Features
Mar 1, 2025March 2025 summary for Problem-solve-study/code-store: Expanded the repository’s problem-solving coverage with a strong emphasis on BOJ problems, enhanced code quality, and improved workflow reliability. Batch 1 of 2025-03 BOJ problems delivered, followed by broad month-long contributions across multiple problem sets and algorithmic domains.
March 2025
February 2025
74 Commits • 51 Features
Feb 1, 2025February 2025 (2025-02) focused on expanding problem-solving coverage, improving code quality, and delivering performance-oriented enhancements in Problem-solve-study/code-store. The month saw extensive feature delivery across a broad set of BOJ/SWEA problems, targeted refactors to improve maintainability, and memory/time optimization efforts that reduce runtime footprints for heavier tasks. Key outcomes include a large batch of new problem solutions, notable refactors, and clearer documentation that supports faster onboarding and future work.
February 2025
74 Commits • 51 Features
Feb 1, 2025February 2025 (2025-02) focused on expanding problem-solving coverage, improving code quality, and delivering performance-oriented enhancements in Problem-solve-study/code-store. The month saw extensive feature delivery across a broad set of BOJ/SWEA problems, targeted refactors to improve maintainability, and memory/time optimization efforts that reduce runtime footprints for heavier tasks. Key outcomes include a large batch of new problem solutions, notable refactors, and clearer documentation that supports faster onboarding and future work.
January 2025
11 Commits • 11 Features
Jan 1, 2025January 2025 (2025-01) monthly summary for Problem-solve-study/code-store. This period delivered a broad set of algorithmic solutions with a focus on correctness, performance, and robust I/O across multiple coding challenges. The work spans recursive backtracking, dynamic programming, greedy/improved data structures, and stream-based I/O, emphasizing scalable, well-structured implementations suitable for review and reuse. Major design improvements include robust edge-case handling, modular arithmetic considerations, and clear separation between problem-solving logic and I/O.
11 Commits • 11 Features
Jan 1, 2025January 2025 (2025-01) monthly summary for Problem-solve-study/code-store. This period delivered a broad set of algorithmic solutions with a focus on correctness, performance, and robust I/O across multiple coding challenges. The work spans recursive backtracking, dynamic programming, greedy/improved data structures, and stream-based I/O, emphasizing scalable, well-structured implementations suitable for review and reuse. Major design improvements include robust edge-case handling, modular arithmetic considerations, and clear separation between problem-solving logic and I/O.
January 2025
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Quality Metrics
Correctness96.0%
Maintainability82.4%
Architecture80.8%
Performance86.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaMarkdown
Technical Skills
0-1 BFS2D Array ProcessingAlgorithmAlgorithm AnalysisAlgorithm DesignAlgorithm ImplementationAlgorithm OptimizationAlgorithmsArray ManipulationArrayDequeAssembly Language SimulationBFSBack-end DevelopmentBacktrackingBigInteger
Repositories Contributed To
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