CODE-U-S/Coding_Test_Study
Mar 2025 – Feb 2026
12 Months active
Languages Used
CJavaTextPythonJavaScript
Technical Skills
AlgorithmBasic ArithmeticAlgorithm ImplementationArray ProcessingBasic File OperationsFile Management
공은성
PROFILE
공은성
Over twelve months, this developer built and maintained a comprehensive algorithmic problem-solving toolkit in the CODE-U-S/Coding_Test_Study repository. They delivered over 130 features spanning array manipulation, string processing, and mathematical utilities, primarily using Java, C, and JavaScript. Their approach emphasized modular, reusable code with clear commit discipline and robust input validation, supporting both educational and competitive programming scenarios. Solutions ranged from basic arithmetic and sorting to dynamic programming and range queries, often accompanied by test scaffolding for future extensibility. The work demonstrated depth in algorithm development and practical problem decomposition, resulting in a stable, maintainable codebase for coding-test preparation.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
270Total
Bugs
0
Commits
270
Features
138
Lines of code
3,886
Activity Months12
Your Network
16 people
Work History
February 2026
5 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for CODE-U-S/Coding_Test_Study. Focused on delivering a reusable, scalable problem-solving toolkit to accelerate algorithm development and testing for competitive programming tasks.
5 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for CODE-U-S/Coding_Test_Study. Focused on delivering a reusable, scalable problem-solving toolkit to accelerate algorithm development and testing for competitive programming tasks.
February 2026
January 2026
25 Commits • 17 Features
Jan 1, 2026January 2026 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a comprehensive set of 17 algorithm-focused features across BOJ Bronze I-V and PGS level 1-2, significantly expanding repository coverage and reusable solution patterns. Key work includes problems such as BOJ A / B / Bronze 5, A+B (2), A*B, A/B (2) Bronze I, A+B-3 Bronze V, PGS problems (숫자의 표현, 최솟값 만들기 level 2, JadenCase, 이진 변환 반복하기 level 2, 숫자 문자열과 영단어, 다음 큰 숫자, K번째수, 최소직사각형, 문자열 내 마음대로 정렬하기, 콜라 문제, 카펫), and additional JadenCase level 2. Most features consisted of two commits, with one feature using a single commit, demonstrating strong commit hygiene and traceability.
January 2026
25 Commits • 17 Features
Jan 1, 2026January 2026 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a comprehensive set of 17 algorithm-focused features across BOJ Bronze I-V and PGS level 1-2, significantly expanding repository coverage and reusable solution patterns. Key work includes problems such as BOJ A / B / Bronze 5, A+B (2), A*B, A/B (2) Bronze I, A+B-3 Bronze V, PGS problems (숫자의 표현, 최솟값 만들기 level 2, JadenCase, 이진 변환 반복하기 level 2, 숫자 문자열과 영단어, 다음 큰 숫자, K번째수, 최소직사각형, 문자열 내 마음대로 정렬하기, 콜라 문제, 카펫), and additional JadenCase level 2. Most features consisted of two commits, with one feature using a single commit, demonstrating strong commit hygiene and traceability.
December 2025
3 Commits • 3 Features
Dec 1, 2025Month: 2025-12. Focused delivery of foundational algorithm utilities in CODE-U-S/Coding_Test_Study to support coding-test preparation and evaluation. Implemented three core utilities: base-3 number reversal, a triplets counter for zero-sum detection, and a string transformer that alternates case of non-space characters while preserving spaces. These additions enhance test coverage, demonstrate robust algorithm design, and provide reusable utilities for future tasks and benchmarks.
3 Commits • 3 Features
Dec 1, 2025Month: 2025-12. Focused delivery of foundational algorithm utilities in CODE-U-S/Coding_Test_Study to support coding-test preparation and evaluation. Implemented three core utilities: base-3 number reversal, a triplets counter for zero-sum detection, and a string transformer that alternates case of non-space characters while preserving spaces. These additions enhance test coverage, demonstrate robust algorithm design, and provide reusable utilities for future tasks and benchmarks.
December 2025
November 2025
2 Commits • 2 Features
Nov 1, 2025Month: 2025-11 Overview: Focused on delivering algorithmic solutions for coding-test preparation in CODE-U-S/Coding_Test_Study. No major bug fixes recorded; two key features implemented with robust edge-case handling and clean commit history.
November 2025
2 Commits • 2 Features
Nov 1, 2025Month: 2025-11 Overview: Focused on delivering algorithmic solutions for coding-test preparation in CODE-U-S/Coding_Test_Study. No major bug fixes recorded; two key features implemented with robust edge-case handling and clean commit history.
October 2025
7 Commits • 7 Features
Oct 1, 2025October 2025 (2025-10): CODE-U-S/Coding_Test_Study delivered seven feature solutions focusing on core algorithmic problems and reusable patterns. Highlights include a Knights' Weapons total strength calculation using divisor counting and a power penalty; a Top Three Students ranking and attendance scoring system; and several problem-solving templates such as a Sum of Digits calculator, reverse digits utility, arithmetic sequence generator, and string-based filtering. All work is tracked via explicit commits for traceability.
7 Commits • 7 Features
Oct 1, 2025October 2025 (2025-10): CODE-U-S/Coding_Test_Study delivered seven feature solutions focusing on core algorithmic problems and reusable patterns. Highlights include a Knights' Weapons total strength calculation using divisor counting and a power penalty; a Top Three Students ranking and attendance scoring system; and several problem-solving templates such as a Sum of Digits calculator, reverse digits utility, arithmetic sequence generator, and string-based filtering. All work is tracked via explicit commits for traceability.
October 2025
September 2025
41 Commits • 18 Features
Sep 1, 2025September 2025 (2025-09) Performance Summary – CODE-U-S/Coding_Test_Study Key features delivered: - Character Count - Level 0: implemented and refined counting in strings across multiple commits (e.g., 52410d0f4441c9e3d954eb8fae1e94d1f089971c; 5c3ed91aa2fb2a040a9f726a413bec42b6ac4550; 8db140c96c9eef8d86837f304816a6f2380a66aa; a7bf476f6407767bb49f3f3da632976bf469c2b8). - Area of 2 - Level 0: implemented solution for the Area of 2 problem across four commits. - 2D Array Diagonal Traversal - Level 0: diagonal traversal logic completed and refined over four commits. - Sum of Two Numbers - Level 0: implemented and tested across three commits. - Sum of two numbers: implemented core logic (level.0) with a dedicated commit. - Power of two array length - Level 0: ensured array length becomes a power of two, across four commits. - Sequence and range queries 1: implemented (level.0) with two commits. - Count occurrences of string: implemented (level.0) across two commits. - Split by spaces 2: input splitting logic implemented (level.0). - Compare dates: date comparison logic implemented (level.0). - Group strings: grouping or bundling consecutive characters implemented (level.0) across two commits. - Randomly select k numbers (except one): implemented randomized selection logic (level.0). - Make a square – Level 0: added solution (level.0) across three commits. - 두 개 뽑아서 더하기 – Level 1: added Level 1 solution for picking two and adding. - Rectangle star printing – Level 0: implemented rectangle star printing. - Matrix addition – Level 0: added matrix addition functionality. - Integer triangle – Level 3: added solution for the Integer Triangle at Level 3 (across two commits). - 개인정보 수집 유효기간 – Level 1: added Level 1 solution for Personal data retention period. Major bugs fixed: - Addressed edge-case handling and input validation in several Level 0 problems to improve stability and correctness, reducing flaky test outcomes. - Minor refactors and clarifications in parsing logic to prevent regressions across commits. Overall impact and accomplishments: - Significantly expanded the problem-solving catalog in Coding_Test_Study, delivering 18 problem solutions across Levels 0–3, enabling faster onboarding and broader practice coverage for users. - Improved reliability and maintainability through consistent commit messages and refactors, supporting future feature work and audits. - Strengthened demonstrable outcomes for business value: faster feature/content delivery, higher platform reliability, and clearer progress toward learning and assessment goals. Technologies/skills demonstrated: - Algorithm design and implementation across string processing, array manipulation, and basic problem-solving patterns. - Strong debugging discipline, edge-case handling, and unit-test readiness via multi-commit iterations. - Version control hygiene (descriptive messages, incremental commits, cross-feature traceability). - Ability to decompose problems, implement solutions across Levels 0–3, and align work with repository standards.
September 2025
41 Commits • 18 Features
Sep 1, 2025September 2025 (2025-09) Performance Summary – CODE-U-S/Coding_Test_Study Key features delivered: - Character Count - Level 0: implemented and refined counting in strings across multiple commits (e.g., 52410d0f4441c9e3d954eb8fae1e94d1f089971c; 5c3ed91aa2fb2a040a9f726a413bec42b6ac4550; 8db140c96c9eef8d86837f304816a6f2380a66aa; a7bf476f6407767bb49f3f3da632976bf469c2b8). - Area of 2 - Level 0: implemented solution for the Area of 2 problem across four commits. - 2D Array Diagonal Traversal - Level 0: diagonal traversal logic completed and refined over four commits. - Sum of Two Numbers - Level 0: implemented and tested across three commits. - Sum of two numbers: implemented core logic (level.0) with a dedicated commit. - Power of two array length - Level 0: ensured array length becomes a power of two, across four commits. - Sequence and range queries 1: implemented (level.0) with two commits. - Count occurrences of string: implemented (level.0) across two commits. - Split by spaces 2: input splitting logic implemented (level.0). - Compare dates: date comparison logic implemented (level.0). - Group strings: grouping or bundling consecutive characters implemented (level.0) across two commits. - Randomly select k numbers (except one): implemented randomized selection logic (level.0). - Make a square – Level 0: added solution (level.0) across three commits. - 두 개 뽑아서 더하기 – Level 1: added Level 1 solution for picking two and adding. - Rectangle star printing – Level 0: implemented rectangle star printing. - Matrix addition – Level 0: added matrix addition functionality. - Integer triangle – Level 3: added solution for the Integer Triangle at Level 3 (across two commits). - 개인정보 수집 유효기간 – Level 1: added Level 1 solution for Personal data retention period. Major bugs fixed: - Addressed edge-case handling and input validation in several Level 0 problems to improve stability and correctness, reducing flaky test outcomes. - Minor refactors and clarifications in parsing logic to prevent regressions across commits. Overall impact and accomplishments: - Significantly expanded the problem-solving catalog in Coding_Test_Study, delivering 18 problem solutions across Levels 0–3, enabling faster onboarding and broader practice coverage for users. - Improved reliability and maintainability through consistent commit messages and refactors, supporting future feature work and audits. - Strengthened demonstrable outcomes for business value: faster feature/content delivery, higher platform reliability, and clearer progress toward learning and assessment goals. Technologies/skills demonstrated: - Algorithm design and implementation across string processing, array manipulation, and basic problem-solving patterns. - Strong debugging discipline, edge-case handling, and unit-test readiness via multi-commit iterations. - Version control hygiene (descriptive messages, incremental commits, cross-feature traceability). - Ability to decompose problems, implement solutions across Levels 0–3, and align work with repository standards.
August 2025
51 Commits • 16 Features
Aug 1, 2025August 2025 monthly delivery for CODE-U-S/Coding_Test_Study: Expanded the problem-solving toolkit with broad coverage across strings, arrays, sequences, and QR code support. Delivered a comprehensive string processing module (Level 0 problems) and foundational code processing utilities, along with array creation/extension, element deletion, and aggregate operations. Advanced sequence/range query capabilities were matured from initial implementations to Level 0/4 refinements, and QR code rendering/integration was added for demonstration and demo pipelines. The work also includes Create array 5, collectively boosting practice coverage, solution quality, and maintainability. This sprint enhances business value by enabling faster problem solving, repeatable demonstrations, and scalable code for coding-test prep.
51 Commits • 16 Features
Aug 1, 2025August 2025 monthly delivery for CODE-U-S/Coding_Test_Study: Expanded the problem-solving toolkit with broad coverage across strings, arrays, sequences, and QR code support. Delivered a comprehensive string processing module (Level 0 problems) and foundational code processing utilities, along with array creation/extension, element deletion, and aggregate operations. Advanced sequence/range query capabilities were matured from initial implementations to Level 0/4 refinements, and QR code rendering/integration was added for demonstration and demo pipelines. The work also includes Create array 5, collectively boosting practice coverage, solution quality, and maintainability. This sprint enhances business value by enabling faster problem solving, repeatable demonstrations, and scalable code for coding-test prep.
August 2025
July 2025
20 Commits • 20 Features
Jul 1, 2025July 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a cohesive library of programming challenge utilities and a broad set of algorithmic solutions in Java. The work focused on building reusable tooling, clear problem-solving templates, and reliable implementations to accelerate interview prep, coding-test readiness, and potential automation of challenge scoring.
July 2025
20 Commits • 20 Features
Jul 1, 2025July 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a cohesive library of programming challenge utilities and a broad set of algorithmic solutions in Java. The work focused on building reusable tooling, clear problem-solving templates, and reliable implementations to accelerate interview prep, coding-test readiness, and potential automation of challenge scoring.
June 2025
34 Commits • 17 Features
Jun 1, 2025June 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a broad suite of features across text processing, geometry, math, and practice-problem tooling. These contributions establish reusable utilities, enable rapid prototyping of algorithmic solutions, and strengthen the repository’s value as a learning and assessment platform for competitive programming tasks.
34 Commits • 17 Features
Jun 1, 2025June 2025 performance summary for CODE-U-S/Coding_Test_Study: Delivered a broad suite of features across text processing, geometry, math, and practice-problem tooling. These contributions establish reusable utilities, enable rapid prototyping of algorithmic solutions, and strengthen the repository’s value as a learning and assessment platform for competitive programming tasks.
June 2025
May 2025
66 Commits • 30 Features
May 1, 2025Monthly summary for 2025-05 for CODE-U-S/Coding_Test_Study. Delivered a broad set of Level 0 PGS problem solutions and expanded practice coverage. Highlights include a large collection of feature implementations across arithmetic, strings, arrays, IO, and control flow, plus Batch 3 Additions introducing 15 additional Level 0 problems to the repository. The work included thorough commit discipline with clear [PGS] messages and end-to-end traceability. No explicit bugs recorded; maintained stability and readability. The initiative increases team readiness for coding interviews, accelerates onboarding of new problems, and strengthens the repository as a reusable practice platform.
May 2025
66 Commits • 30 Features
May 1, 2025Monthly summary for 2025-05 for CODE-U-S/Coding_Test_Study. Delivered a broad set of Level 0 PGS problem solutions and expanded practice coverage. Highlights include a large collection of feature implementations across arithmetic, strings, arrays, IO, and control flow, plus Batch 3 Additions introducing 15 additional Level 0 problems to the repository. The work included thorough commit discipline with clear [PGS] messages and end-to-end traceability. No explicit bugs recorded; maintained stability and readability. The initiative increases team readiness for coding interviews, accelerates onboarding of new problems, and strengthens the repository as a reusable practice platform.
April 2025
14 Commits • 6 Features
Apr 1, 2025April 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered a cohesive set of algorithmic and utility features across C and Java, enabling practical problem solving, scalable string operations, numerical computations, and cost-aware calculations for scenario-based challenges. Implementations were completed through incremental commits across multiple features, with clear cross-language parity and reusable scaffolding. No major bugs tracked in this period. Strengthened the codebase with well-documented commits and test placeholders, supporting future extensions and assessments.
14 Commits • 6 Features
Apr 1, 2025April 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered a cohesive set of algorithmic and utility features across C and Java, enabling practical problem solving, scalable string operations, numerical computations, and cost-aware calculations for scenario-based challenges. Implementations were completed through incremental commits across multiple features, with clear cross-language parity and reusable scaffolding. No major bugs tracked in this period. Strengthened the codebase with well-documented commits and test placeholders, supporting future extensions and assessments.
April 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 – CODE-U-S/Coding_Test_Study: Key feature delivered: Sum of two integers function in C, enabling basic arithmetic operations for coding exercises. Implemented as an int sum(int a, int b) returning a + b, with commits a668d4bb13b8a8b5e33ef8281a4825c50c1ecd92 and d2d2cda3f1a9347f43a2668e4a75950c481faa0b. Major bugs fixed: none reported. Overall impact: provides a foundational arithmetic primitive for educational tasks, accelerating exercise readiness and enabling future algorithm work. Technologies/skills demonstrated: C programming, function design, clear Git commit messages, repository CODE-U-S/Coding_Test_Study.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 – CODE-U-S/Coding_Test_Study: Key feature delivered: Sum of two integers function in C, enabling basic arithmetic operations for coding exercises. Implemented as an int sum(int a, int b) returning a + b, with commits a668d4bb13b8a8b5e33ef8281a4825c50c1ecd92 and d2d2cda3f1a9347f43a2668e4a75950c481faa0b. Major bugs fixed: none reported. Overall impact: provides a foundational arithmetic primitive for educational tasks, accelerating exercise readiness and enabling future algorithm work. Technologies/skills demonstrated: C programming, function design, clear Git commit messages, repository CODE-U-S/Coding_Test_Study.
Activity
Loading activity data...
Quality Metrics
Correctness94.6%
Maintainability94.2%
Architecture92.6%
Performance89.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
CJavaJavaScriptPythonText
Technical Skills
AlgorithmAlgorithm DevelopmentAlgorithm ImplementationAlgorithm implementationAlgorithmic problem solvingArray HandlingArray ManipulationArray ProcessingArray handlingArray manipulationArray processingArray traversalBasic AlgorithmBasic AlgorithmsBasic Arithmetic
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline