CTStudyGroup/BOJ
Mar 2025 – Jan 2026
11 Months active
Languages Used
C++Python
Technical Skills
AlgorithmAlgorithm DesignAlgorithm ImplementationBacktrackingBreadth-First SearchBreadth-First Search (BFS)
KII1ua
PROFILE
Kii1ua
Sung25480 developed a modular, scalable problem-solving toolkit for the CTStudyGroup/BOJ repository, delivering over 100 C++ modules focused on algorithms, data structures, and grid-based computation. Their work emphasized reusable architecture, robust input/output handling, and maintainable code organization, enabling efficient onboarding and rapid feature expansion. Leveraging C++ and Python, Sung25480 implemented solutions using dynamic programming, graph traversal, and topological sorting, addressing challenges such as grid pathfinding, task scheduling, and combinatorial counting. The codebase benefited from disciplined version control, descriptive commits, and iterative refinement, resulting in a maintainable foundation that accelerates future development and supports competitive programming workflows.
Overall Statistics
Feature vs Bugs
99%Features
Repository Contributions
203Total
Bugs
1
Commits
203
Features
110
Lines of code
16,342
Activity Months11
Your Network
1010 people
Work History
January 2026
2 Commits • 1 Features
Jan 1, 2026Month: 2026-01 — Focused on expanding grid-based problem-solving capabilities in CTStudyGroup/BOJ. Key features delivered: two new C++ implementations for grid problems — (1) Longest Increasing Path in a Grid via graph traversal and dynamic programming; (2) BFS-based height management for grid structures. These were added in commits cbaa5653db5acae0c78f23c118caf80aa158bc03 ("1937.cpp add") and 3d78254aa018651d47995632479625f67dc54577 ("1113.cpp add"). Impact: strengthened algorithm toolkit for competitive programming, enabling more efficient path computations and state management in grid-based tasks, reducing future development time and enabling more robust solution patterns. Technologies demonstrated: C++, graph traversal, dynamic programming, BFS, and disciplined version control.
2 Commits • 1 Features
Jan 1, 2026Month: 2026-01 — Focused on expanding grid-based problem-solving capabilities in CTStudyGroup/BOJ. Key features delivered: two new C++ implementations for grid problems — (1) Longest Increasing Path in a Grid via graph traversal and dynamic programming; (2) BFS-based height management for grid structures. These were added in commits cbaa5653db5acae0c78f23c118caf80aa158bc03 ("1937.cpp add") and 3d78254aa018651d47995632479625f67dc54577 ("1113.cpp add"). Impact: strengthened algorithm toolkit for competitive programming, enabling more efficient path computations and state management in grid-based tasks, reducing future development time and enabling more robust solution patterns. Technologies demonstrated: C++, graph traversal, dynamic programming, BFS, and disciplined version control.
January 2026
December 2025
3 Commits • 3 Features
Dec 1, 2025Month: 2025-12 — This performance review covers the CTStudyGroup/BOJ repository. The month focused on delivering robust algorithmic solutions and establishing reusable foundations. Key features delivered include: Efficient Lexicographic String Builder, Pizza Slice Sum Combinations Calculator, and Task Scheduling with Topological Sorting. Major bugs fixed: none documented this period. Overall impact and accomplishments: improved problem-solving toolkit, faster solution development, and more reliable task orchestration through dependency-aware scheduling. Technologies and skills demonstrated: C++, two-pointer techniques, topological sorting, combinatorial counting, modular design, and strong commit traceability.
December 2025
3 Commits • 3 Features
Dec 1, 2025Month: 2025-12 — This performance review covers the CTStudyGroup/BOJ repository. The month focused on delivering robust algorithmic solutions and establishing reusable foundations. Key features delivered include: Efficient Lexicographic String Builder, Pizza Slice Sum Combinations Calculator, and Task Scheduling with Topological Sorting. Major bugs fixed: none documented this period. Overall impact and accomplishments: improved problem-solving toolkit, faster solution development, and more reliable task orchestration through dependency-aware scheduling. Technologies and skills demonstrated: C++, two-pointer techniques, topological sorting, combinatorial counting, modular design, and strong commit traceability.
November 2025
5 Commits • 2 Features
Nov 1, 2025November 2025: Focused on delivering core algorithmic capabilities for the CTStudyGroup/BOJ repository, emphasizing tree-based data processing and grid analysis through dynamic programming. Implemented foundational data structures and traversal methods, plus a DP solution for the largest square submatrix of 1s, laying groundwork for scalable problem solving and future enhancements. The work improves problem-solving efficiency, code reuse, and maintainability, supporting competitive programming workflows.
5 Commits • 2 Features
Nov 1, 2025November 2025: Focused on delivering core algorithmic capabilities for the CTStudyGroup/BOJ repository, emphasizing tree-based data processing and grid analysis through dynamic programming. Implemented foundational data structures and traversal methods, plus a DP solution for the largest square submatrix of 1s, laying groundwork for scalable problem solving and future enhancements. The work improves problem-solving efficiency, code reuse, and maintainability, supporting competitive programming workflows.
November 2025
October 2025
29 Commits • 16 Features
Oct 1, 2025October 2025 (2025-10) monthly summary for CTStudyGroup/BOJ. The month focused on expanding the codebase with a broad set of new C++ modules across core libraries, data input/output, serialization, and mathematical algorithms to accelerate problem solving, improve data handling, and enhance code reuse. No explicit bug fixes were reported in the provided data for this period.
October 2025
29 Commits • 16 Features
Oct 1, 2025October 2025 (2025-10) monthly summary for CTStudyGroup/BOJ. The month focused on expanding the codebase with a broad set of new C++ modules across core libraries, data input/output, serialization, and mathematical algorithms to accelerate problem solving, improve data handling, and enhance code reuse. No explicit bug fixes were reported in the provided data for this period.
September 2025
23 Commits • 21 Features
Sep 1, 2025September 2025 performance for CTStudyGroup/BOJ: Delivered a substantial expansion of problem-solving capabilities via 21 new C++ modules and problem solutions, including multi-commit updates (15624.cpp). Implementations span a broad problem set with isolated, testable components. A minor typo fix was included in 2961.cpp to tighten correctness. No major defects reported; code quality maintained through descriptive commits and consistent naming. The work lays groundwork for future optimizations and benchmarking and improves maintenance and onboarding velocity.
23 Commits • 21 Features
Sep 1, 2025September 2025 performance for CTStudyGroup/BOJ: Delivered a substantial expansion of problem-solving capabilities via 21 new C++ modules and problem solutions, including multi-commit updates (15624.cpp). Implementations span a broad problem set with isolated, testable components. A minor typo fix was included in 2961.cpp to tighten correctness. No major defects reported; code quality maintained through descriptive commits and consistent naming. The work lays groundwork for future optimizations and benchmarking and improves maintenance and onboarding velocity.
September 2025
August 2025
30 Commits • 17 Features
Aug 1, 2025August 2025 CTStudyGroup/BOJ monthly summary focused on rapid feature expansion and architectural groundwork. Delivered extensive modular growth across the repository by adding 14 new problem-solving modules and establishing foundational code organization to improve onboarding, reuse, and maintainability. No explicit bug fixes were reported in this period; emphasis was on adding capabilities and stabilizing the codebase for scalable problem solving.
August 2025
30 Commits • 17 Features
Aug 1, 2025August 2025 CTStudyGroup/BOJ monthly summary focused on rapid feature expansion and architectural groundwork. Delivered extensive modular growth across the repository by adding 14 new problem-solving modules and establishing foundational code organization to improve onboarding, reuse, and maintainability. No explicit bug fixes were reported in this period; emphasis was on adding capabilities and stabilizing the codebase for scalable problem solving.
July 2025
28 Commits • 7 Features
Jul 1, 2025July 2025 (CTStudyGroup/BOJ): Delivered a modular foundation for scalable data processing and robust I/O. Implemented foundational utilities, core computation modules, and extended feature modules (12764/17503/2295), complemented by Additional Basic Modules and Core Utilities/Framework Initialization. Added Data Parsing & Serialization Layer and Data I/O Modules to enable reliable data ingestion, parsing, and persistence. This work prioritizes business value by accelerating future feature delivery, improving pipeline reliability, and reducing integration risk, while establishing a maintainable architecture with clear module ownership and testability.
28 Commits • 7 Features
Jul 1, 2025July 2025 (CTStudyGroup/BOJ): Delivered a modular foundation for scalable data processing and robust I/O. Implemented foundational utilities, core computation modules, and extended feature modules (12764/17503/2295), complemented by Additional Basic Modules and Core Utilities/Framework Initialization. Added Data Parsing & Serialization Layer and Data I/O Modules to enable reliable data ingestion, parsing, and persistence. This work prioritizes business value by accelerating future feature delivery, improving pipeline reliability, and reducing integration risk, while establishing a maintainable architecture with clear module ownership and testability.
July 2025
June 2025
23 Commits • 9 Features
Jun 1, 2025June 2025 – CTStudyGroup/BOJ: Expanded the codebase with a substantial modular push, delivering 23 new C++ modules that lay the groundwork for upcoming features and performance improvements. Batch 1 introduced 15 new module files, plus eight targeted additions (16943.cpp, 13335.cpp, 15724.cpp, 9934.cpp, 10159.cpp, 14698.cpp, 19236.cpp, 1707.cpp) to broaden functionality across the project. This work establishes a scalable, maintainable module architecture and accelerates future feature delivery.
June 2025
23 Commits • 9 Features
Jun 1, 2025June 2025 – CTStudyGroup/BOJ: Expanded the codebase with a substantial modular push, delivering 23 new C++ modules that lay the groundwork for upcoming features and performance improvements. Batch 1 introduced 15 new module files, plus eight targeted additions (16943.cpp, 13335.cpp, 15724.cpp, 9934.cpp, 10159.cpp, 14698.cpp, 19236.cpp, 1707.cpp) to broaden functionality across the project. This work establishes a scalable, maintainable module architecture and accelerates future feature delivery.
May 2025
23 Commits • 16 Features
May 1, 2025Month: 2025-05 — Delivered 24 new C++ modules to CTStudyGroup/BOJ across two batches, enhancing functionality and modular architecture. Key features included 24 modules such as 24480.cpp, 17069.cpp, 16719.cpp, 2229.cpp, 2631.cpp, 13023.cpp, 1303.cpp, 11899.cpp, 22251.cpp, 1743.cpp, 7511.cpp, 1790cpp, 18429.cpp, 2011.cpp, 15990.cpp, and Batch 2 additions: 1105.cpp, 24479.cpp, 19598.cpp, 20437.cpp, 15686.cpp, 10025.cpp, 18290.cpp, 15565.cpp. Each module was added via dedicated commits, ensuring traceability and clean integration into the existing codebase.
23 Commits • 16 Features
May 1, 2025Month: 2025-05 — Delivered 24 new C++ modules to CTStudyGroup/BOJ across two batches, enhancing functionality and modular architecture. Key features included 24 modules such as 24480.cpp, 17069.cpp, 16719.cpp, 2229.cpp, 2631.cpp, 13023.cpp, 1303.cpp, 11899.cpp, 22251.cpp, 1743.cpp, 7511.cpp, 1790cpp, 18429.cpp, 2011.cpp, 15990.cpp, and Batch 2 additions: 1105.cpp, 24479.cpp, 19598.cpp, 20437.cpp, 15686.cpp, 10025.cpp, 18290.cpp, 15565.cpp. Each module was added via dedicated commits, ensuring traceability and clean integration into the existing codebase.
May 2025
April 2025
31 Commits • 15 Features
Apr 1, 2025Month: 2025-04 — CTStudyGroup/BOJ delivered a substantial modular expansion and feature enablement through the addition of a broad set of new C++ modules across the repository. Notable module additions include 17086.cpp, 3019.cpp, 17406.cpp (initial and follow-up), 3184.cpp, 1025.cpp, 2212.cpp, 17825.cpp, 1283.cpp, 17952.cpp, 8972.cpp, 11000.cpp, 2012.cpp and 2002.cpp, with Batch 2 File Additions expanding capability to 2650.cpp, 2210.cpp, 15664.cpp, 6236.cpp, 20164.cpp, 1051.cpp, 16174.cpp, 15662.cpp, 1245.cpp, 1911.cpp, 16926.cpp, 16198.cpp, 2643.cpp, 12847.cpp, and 2866.cpp. A dedicated bug fix addressed the df issue, improving stability (commit df). These changes pave the way for parallel development, faster builds, and easier testing, strengthening code quality and long-term scalability. Overall impact includes expanded functionality, improved maintainability, and a solid foundation for upcoming features.
April 2025
31 Commits • 15 Features
Apr 1, 2025Month: 2025-04 — CTStudyGroup/BOJ delivered a substantial modular expansion and feature enablement through the addition of a broad set of new C++ modules across the repository. Notable module additions include 17086.cpp, 3019.cpp, 17406.cpp (initial and follow-up), 3184.cpp, 1025.cpp, 2212.cpp, 17825.cpp, 1283.cpp, 17952.cpp, 8972.cpp, 11000.cpp, 2012.cpp and 2002.cpp, with Batch 2 File Additions expanding capability to 2650.cpp, 2210.cpp, 15664.cpp, 6236.cpp, 20164.cpp, 1051.cpp, 16174.cpp, 15662.cpp, 1245.cpp, 1911.cpp, 16926.cpp, 16198.cpp, 2643.cpp, 12847.cpp, and 2866.cpp. A dedicated bug fix addressed the df issue, improving stability (commit df). These changes pave the way for parallel development, faster builds, and easier testing, strengthening code quality and long-term scalability. Overall impact includes expanded functionality, improved maintainability, and a solid foundation for upcoming features.
March 2025
6 Commits • 3 Features
Mar 1, 2025March 2025 was focused on delivering scalable grid- and range-query problem-solving capabilities in CTStudyGroup/BOJ, with an emphasis on robust algorithms, performance, and maintainability. The month delivered three feature families with concrete, reusable implementations that enhance problem-solving throughput and reliability for competitive programming workflows.
6 Commits • 3 Features
Mar 1, 2025March 2025 was focused on delivering scalable grid- and range-query problem-solving capabilities in CTStudyGroup/BOJ, with an emphasis on robust algorithms, performance, and maintainability. The month delivered three feature families with concrete, reusable implementations that enhance problem-solving throughput and reliability for competitive programming workflows.
March 2025
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Quality Metrics
Correctness83.6%
Maintainability79.6%
Architecture70.8%
Performance78.0%
AI Usage20.4%
Skills & Technologies
Programming Languages
C++Python
Technical Skills
2D Range Sum QueriesAlgorithmAlgorithm DesignAlgorithm ImplementationAlgorithmsBFSBack-end DevelopmentBacktrackingBasic Input/OutputBasic ProgrammingBinary SearchBipartite Graph CheckingBit ManipulationBoolean LogicBreadth-First Search
Repositories Contributed To
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