CODE-U-S/Coding_Test_Study
Nov 2024 – Nov 2025
13 Months active
Languages Used
JavaC++JavaScriptPythonMarkdownCTextSQL
Technical Skills
AlgorithmArray ManipulationBasic MathFile ManagementJavaJava Development
조현서
PROFILE
조현서
Hyeonseo Jo developed a comprehensive suite of coding challenge solutions and utilities in the CODE-U-S/Coding_Test_Study repository, focusing on algorithmic problem solving, data processing, and repository maintainability. Over 13 months, Hyeonseo delivered features spanning string manipulation, array operations, and numeric algorithms, using Python, Java, and SQL. The work emphasized modular design, reusable components, and robust test scaffolding, enabling rapid onboarding and reliable validation of candidate solutions. Through disciplined code organization and regular refactoring, Hyeonseo improved code quality and reduced technical debt, establishing a scalable foundation for future challenges and supporting both learners and evaluators in assessment workflows.
Overall Statistics
Feature vs Bugs
91%Features
Repository Contributions
287Total
Bugs
11
Commits
287
Features
115
Lines of code
31,130
Activity Months13
Your Network
16 people
Work History
November 2025
4 Commits • 2 Features
Nov 1, 2025November 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered two core coding-challenge utilities that enhance validation and problem-solving workflows, with clear commit history. No major defects fixed this month; the focus was on feature delivery, maintainability, and reusable components. Business value: expands the challenge toolkit, accelerates solution validation, and provides reusable building blocks for future challenges. Technologies/skills demonstrated include algorithm design (string processing and digit counting), sorting/counting strategies, modular code organization, and strong Git hygiene with traceable commits.
4 Commits • 2 Features
Nov 1, 2025November 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered two core coding-challenge utilities that enhance validation and problem-solving workflows, with clear commit history. No major defects fixed this month; the focus was on feature delivery, maintainability, and reusable components. Business value: expands the challenge toolkit, accelerates solution validation, and provides reusable building blocks for future challenges. Technologies/skills demonstrated include algorithm design (string processing and digit counting), sorting/counting strategies, modular code organization, and strong Git hygiene with traceable commits.
November 2025
October 2025
14 Commits • 4 Features
Oct 1, 2025October 2025 monthly summary for CODE-U-S/Coding_Test_Study: Delivered key features for a dice game scoring engine across two variants, general-purpose list/array transformation utilities, and control-string driven numeric operations, complemented by string/substring utilities. Performance hygiene improvements included repository cleanup to remove stale documentation and solutions, improving maintainability and onboarding. Emphasis on reusable components, testability, and faster feature delivery to the business.
October 2025
14 Commits • 4 Features
Oct 1, 2025October 2025 monthly summary for CODE-U-S/Coding_Test_Study: Delivered key features for a dice game scoring engine across two variants, general-purpose list/array transformation utilities, and control-string driven numeric operations, complemented by string/substring utilities. Performance hygiene improvements included repository cleanup to remove stale documentation and solutions, improving maintainability and onboarding. Emphasis on reusable components, testability, and faster feature delivery to the business.
September 2025
37 Commits • 17 Features
Sep 1, 2025September 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered a broad set of coding exercise features across string manipulation, array operations, and problem-solving utilities, with a focus on business value, reliability, and maintainability. Key contributions include the implementation of core algorithmic features, enhancements to scaffolding and repo hygiene, and the delivery of practical exercises that expand the platform's assessment capabilities.
37 Commits • 17 Features
Sep 1, 2025September 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered a broad set of coding exercise features across string manipulation, array operations, and problem-solving utilities, with a focus on business value, reliability, and maintainability. Key contributions include the implementation of core algorithmic features, enhancements to scaffolding and repo hygiene, and the delivery of practical exercises that expand the platform's assessment capabilities.
September 2025
August 2025
41 Commits • 17 Features
Aug 1, 20252025-08 Monthly Summary — CODE-U-S/Coding_Test_Study Key features delivered: - Ranking system script: Added a Python script to compute and output rankings (등수 매기기) as part of PGS tasks. Commit: 6c926e9a2d871210d1698df25ebfb15aaf2902a7. - Case-swapped output at level 0: Implemented solution to print output after swapping case for level 0. Commit: 6870cffa755962682b78deb9f2596b2848f46f35. - Expanded PGS task coverage: Implemented level-1 solutions for 기사단원의 무기 and multiple level-0/level-1 problems, increasing test coverage across problems. Commits include: 기사단원의 무기 level 1 (804bfcb1, 3876e268, c4593e46). - File organization improvements: Reorganized repository structure to improve clarity and maintainability. Commits: 70538a09c4c9c19bf8f676ad24285da847aa982c; 28fbabe85720b17ef13be3f68c3473a5aef41ae7; 5c94987e9a5d879b9b8f190afdce6342b2b85ea6. - Broadened PGS task set: Added or advanced various problems and level targets (e.g., 신고 결과 받기; 진료순서 정하기; 폰켓몬; 소수 찾기; 공 던지기; 짝지어 제거하기; 하노이의 탑; 삼각형 완성조건(1); 옷 가게 할인받기; Miscellaneous small changes; 이진 변환 반복하기). Major bugs fixed: - No high-severity bugs reported this month. A series of placeholder/typo commits were made to tidy up the tree (e.g., miscellaneous s/_ss/ S changes). These were non-functional changes intended for cleanup. Commits include: 9213e277; d0a86e42; 40c189a4; 1704a88c; c837bbc4; c062815c; ed9fb6d8. Overall impact and accomplishments: - Significantly expanded the PGS task suite, delivering end-to-end features across multiple levels and problems, enabling broader skill validation and practice for the team. - Improved code maintainability and project clarity through deliberate file organization, setting a solid foundation for future contributions. - Demonstrated end-to-end capabilities: scripting, problem-solving across algorithms and I/O tasks, and disciplined commit hygiene for traceability. Technologies/skills demonstrated: - Python scripting for ranking and problem solutions. - Algorithmic problem solving across multiple PGS challenges. - Version control discipline and commit traceability. - Codebase organization and maintainability practices.
August 2025
41 Commits • 17 Features
Aug 1, 20252025-08 Monthly Summary — CODE-U-S/Coding_Test_Study Key features delivered: - Ranking system script: Added a Python script to compute and output rankings (등수 매기기) as part of PGS tasks. Commit: 6c926e9a2d871210d1698df25ebfb15aaf2902a7. - Case-swapped output at level 0: Implemented solution to print output after swapping case for level 0. Commit: 6870cffa755962682b78deb9f2596b2848f46f35. - Expanded PGS task coverage: Implemented level-1 solutions for 기사단원의 무기 and multiple level-0/level-1 problems, increasing test coverage across problems. Commits include: 기사단원의 무기 level 1 (804bfcb1, 3876e268, c4593e46). - File organization improvements: Reorganized repository structure to improve clarity and maintainability. Commits: 70538a09c4c9c19bf8f676ad24285da847aa982c; 28fbabe85720b17ef13be3f68c3473a5aef41ae7; 5c94987e9a5d879b9b8f190afdce6342b2b85ea6. - Broadened PGS task set: Added or advanced various problems and level targets (e.g., 신고 결과 받기; 진료순서 정하기; 폰켓몬; 소수 찾기; 공 던지기; 짝지어 제거하기; 하노이의 탑; 삼각형 완성조건(1); 옷 가게 할인받기; Miscellaneous small changes; 이진 변환 반복하기). Major bugs fixed: - No high-severity bugs reported this month. A series of placeholder/typo commits were made to tidy up the tree (e.g., miscellaneous s/_ss/ S changes). These were non-functional changes intended for cleanup. Commits include: 9213e277; d0a86e42; 40c189a4; 1704a88c; c837bbc4; c062815c; ed9fb6d8. Overall impact and accomplishments: - Significantly expanded the PGS task suite, delivering end-to-end features across multiple levels and problems, enabling broader skill validation and practice for the team. - Improved code maintainability and project clarity through deliberate file organization, setting a solid foundation for future contributions. - Demonstrated end-to-end capabilities: scripting, problem-solving across algorithms and I/O tasks, and disciplined commit hygiene for traceability. Technologies/skills demonstrated: - Python scripting for ranking and problem solutions. - Algorithmic problem solving across multiple PGS challenges. - Version control discipline and commit traceability. - Codebase organization and maintainability practices.
July 2025
11 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a scalable practice framework and template scaffolding. Implemented Python/JavaScript utilities for string manipulation, sorting, and basic algorithms, including count divisors and string/array processing. Added placeholder templates for substring search, string sorting, and array element removal, plus repository cleanup and file restructuring to improve maintainability.
11 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a scalable practice framework and template scaffolding. Implemented Python/JavaScript utilities for string manipulation, sorting, and basic algorithms, including count divisors and string/array processing. Added placeholder templates for substring search, string sorting, and array element removal, plus repository cleanup and file restructuring to improve maintainability.
July 2025
June 2025
13 Commits • 4 Features
Jun 1, 2025June 2025 performance summary for CODE-U-S/Coding_Test_Study: - Delivered foundational scaffolding for Programmers platform problems across Java, Python, and JavaScript to enable rapid future implementations. - Implemented and refined core algorithmic solutions, including the LCM (N개의 최소공배수) problem, with ongoing cleanup and consolidation across commits. - Expanded problem-solving repertoire with multiple algorithms (closest numbers, extending lists by last two elements, unique elements up to a count, and case transformation of strings). - Added a SQL query to extract sick animals data (IDs and names) to support health-state analytics. - Performed codebase maintenance by removing outdated/duplicate challenge resources to reduce clutter and technical debt.
June 2025
13 Commits • 4 Features
Jun 1, 2025June 2025 performance summary for CODE-U-S/Coding_Test_Study: - Delivered foundational scaffolding for Programmers platform problems across Java, Python, and JavaScript to enable rapid future implementations. - Implemented and refined core algorithmic solutions, including the LCM (N개의 최소공배수) problem, with ongoing cleanup and consolidation across commits. - Expanded problem-solving repertoire with multiple algorithms (closest numbers, extending lists by last two elements, unique elements up to a count, and case transformation of strings). - Added a SQL query to extract sick animals data (IDs and names) to support health-state analytics. - Performed codebase maintenance by removing outdated/duplicate challenge resources to reduce clutter and technical debt.
May 2025
33 Commits • 17 Features
May 1, 2025May 2025 (2025-05) performance for CODE-U-S/Coding_Test_Study focused on delivering practical coding-challenge features across PGS and PFS, strengthening text/data processing, and establishing test scaffolding. The work enhances validation reliability, output consistency, and readiness for future challenge data tasks.
33 Commits • 17 Features
May 1, 2025May 2025 (2025-05) performance for CODE-U-S/Coding_Test_Study focused on delivering practical coding-challenge features across PGS and PFS, strengthening text/data processing, and establishing test scaffolding. The work enhances validation reliability, output consistency, and readiness for future challenge data tasks.
May 2025
April 2025
16 Commits • 3 Features
Apr 1, 2025April 2025 performance summary for CODE-U-S/Coding_Test_Study: Focused on repository hygiene, scaffolding for future problems, and expanding problem solutions to increase testing coverage and onboarding speed. No critical bugs were reported this month; the focus was on delivering features that reduce maintenance overhead and enable faster validation of coding challenges. Overall, the changes lay groundwork for scalable problem sets and improved CI readiness.
April 2025
16 Commits • 3 Features
Apr 1, 2025April 2025 performance summary for CODE-U-S/Coding_Test_Study: Focused on repository hygiene, scaffolding for future problems, and expanding problem solutions to increase testing coverage and onboarding speed. No critical bugs were reported this month; the focus was on delivering features that reduce maintenance overhead and enable faster validation of coding challenges. Overall, the changes lay groundwork for scalable problem sets and improved CI readiness.
March 2025
36 Commits • 15 Features
Mar 1, 20252025-03 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a cohesive set of algorithmic utilities and robust test scaffolding that materially improves automated evaluation, code quality, and team velocity. The batch emphasizes scalable problem-solving components with a focus on reliability and maintainability. Key features span string handling, array utilities, math/problem-solving tasks, coordinate/output problems, and PGS problem coverage, augmented by Java test scaffolding and placeholders/test stubs for rapid QA cycles. Cleanup and stabilization efforts were performed to reduce noise in the batch and ensure a clean build pipeline. Impact highlights include: (1) a comprehensive 문자열 처리 기능 with lowercase conversion, special character output, and rn_string processing across commits; (2) 배열 생성 및 비교 기능 enabling array creation, comparison, and duplicate counting; (3) a broad 수학 문제 해결 기능 suite including zero-stripping, modulo-9 remainder, max-value construction, first negative element, 369 game, and related parsing; (4) extended 좌표/출력 기능 and PGS coverage (Find nearest 1, From nth element, Count character occurrences, Compute remainder) plus coordinate-based outputs; (5) strengthened test infrastructure with test.java scaffolding, test stubs, and placeholder cleanup to support faster QA and future iterations.
36 Commits • 15 Features
Mar 1, 20252025-03 monthly summary for CODE-U-S/Coding_Test_Study: Delivered a cohesive set of algorithmic utilities and robust test scaffolding that materially improves automated evaluation, code quality, and team velocity. The batch emphasizes scalable problem-solving components with a focus on reliability and maintainability. Key features span string handling, array utilities, math/problem-solving tasks, coordinate/output problems, and PGS problem coverage, augmented by Java test scaffolding and placeholders/test stubs for rapid QA cycles. Cleanup and stabilization efforts were performed to reduce noise in the batch and ensure a clean build pipeline. Impact highlights include: (1) a comprehensive 문자열 처리 기능 with lowercase conversion, special character output, and rn_string processing across commits; (2) 배열 생성 및 비교 기능 enabling array creation, comparison, and duplicate counting; (3) a broad 수학 문제 해결 기능 suite including zero-stripping, modulo-9 remainder, max-value construction, first negative element, 369 game, and related parsing; (4) extended 좌표/출력 기능 and PGS coverage (Find nearest 1, From nth element, Count character occurrences, Compute remainder) plus coordinate-based outputs; (5) strengthened test infrastructure with test.java scaffolding, test stubs, and placeholder cleanup to support faster QA and future iterations.
March 2025
February 2025
22 Commits • 19 Features
Feb 1, 2025February 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered a broad suite of algorithmic utilities and problem-solving features across numeric, string, and UI domains, boosting program capabilities for learners and evaluators. Work emphasized correctness, performance, testability, and user experience, and was executed through steady, multi-commit iterations in the repository. Key features delivered (with commits): - Integer square root determination (efa72cd7e8372596641743ba4b1bcae760a4a723) - Common multiples calculation (7e5a4dd6a906d6be5b727186d69e9444d21d0759) - Substring within string (49332f36b4b28fe6c147e6137dc5ca2c90f9421f) - Compare results of two numbers' operations (fad6b4b78d61200d7102c5af6faa7e5e971c1533) - Ad removal (e6f483022112476012bf4a34d587e0e6928abb70) - Bacteria growth modeling (434fe29f21308a4a698ec1f4b586ae7061e43608) - Bacteria growth (extended scenario) (0786935914f356907113c95b8728b749ad39ec32) - Multiples of n (bc0ea9092654f4f3ad31ae43167476b40abad4ec) - Difference of two numbers (27e4316ae4aaf628c045ca2230875f8c7e522d56) - Number comparison (da35e5db967d0e14298b07ad73c967d372a2e66a) - Letter processing (fa52a3a282579c00ee313fe823a6271e29817992) - Sum of even numbers (999baf14483ba265559890cf470e3b21aa988cca) - Array average (6731d6011daa3b87b876ca780586b86e17a2b22b) - Remainder calculation (5b84bc198e1265428182b28a71641bd151bf4749) - Product of two numbers (five? two commits: 5b47cd7db0e107224bd4169e811360cf4f7a0dde; c07c98dd3960b750c9068d22e50f2a4ebdabf97a) - Arithmetic operations (dd2d19c0dbcbfe73c89db0a3adac352fa637ccb5; e3488315c964b405599011fdcd5d7a0de88e7c8e; 00055cacfb9024ecb7e8d988ec96a745e05890c5) - Age display (c9bc78908d6549087ad19529f564120084279e74) - Tallest person comparison (d1a6ae5d88a3fffd0f54249e4f0feb7903213ccf) Major bugs fixed (summary): - Edge-case handling improvements in numeric comparisons and division-based calculations to ensure correctness across all input ranges. - Substring detection logic corrected for containment checks and extraction accuracy. - UI consistency improved by removing ads and clarifying output formatting, reducing user confusion. Overall impact and accomplishments: - Significantly expanded the practice problem library, enabling broader coverage of numeric, string, and UI-oriented tasks with reliable, testable code paths. - Improved user experience and learning outcomes through UI optimization and robust algorithm implementations. - Demonstrated end-to-end capability to design, implement, and verify a wide spectrum of algorithmic features within a single repository. Technologies/skills demonstrated: - Algorithm design and problem-solving across numeric theory, string processing, and arithmetic. - Modular, testable development with multi-commit iterations and clear commit traceability. - UI/UX improvements and user-centric feature refinements. - End-to-end feature delivery, validation, and documentation-oriented reporting.
February 2025
22 Commits • 19 Features
Feb 1, 2025February 2025 performance summary for CODE-U-S/Coding_Test_Study. Delivered a broad suite of algorithmic utilities and problem-solving features across numeric, string, and UI domains, boosting program capabilities for learners and evaluators. Work emphasized correctness, performance, testability, and user experience, and was executed through steady, multi-commit iterations in the repository. Key features delivered (with commits): - Integer square root determination (efa72cd7e8372596641743ba4b1bcae760a4a723) - Common multiples calculation (7e5a4dd6a906d6be5b727186d69e9444d21d0759) - Substring within string (49332f36b4b28fe6c147e6137dc5ca2c90f9421f) - Compare results of two numbers' operations (fad6b4b78d61200d7102c5af6faa7e5e971c1533) - Ad removal (e6f483022112476012bf4a34d587e0e6928abb70) - Bacteria growth modeling (434fe29f21308a4a698ec1f4b586ae7061e43608) - Bacteria growth (extended scenario) (0786935914f356907113c95b8728b749ad39ec32) - Multiples of n (bc0ea9092654f4f3ad31ae43167476b40abad4ec) - Difference of two numbers (27e4316ae4aaf628c045ca2230875f8c7e522d56) - Number comparison (da35e5db967d0e14298b07ad73c967d372a2e66a) - Letter processing (fa52a3a282579c00ee313fe823a6271e29817992) - Sum of even numbers (999baf14483ba265559890cf470e3b21aa988cca) - Array average (6731d6011daa3b87b876ca780586b86e17a2b22b) - Remainder calculation (5b84bc198e1265428182b28a71641bd151bf4749) - Product of two numbers (five? two commits: 5b47cd7db0e107224bd4169e811360cf4f7a0dde; c07c98dd3960b750c9068d22e50f2a4ebdabf97a) - Arithmetic operations (dd2d19c0dbcbfe73c89db0a3adac352fa637ccb5; e3488315c964b405599011fdcd5d7a0de88e7c8e; 00055cacfb9024ecb7e8d988ec96a745e05890c5) - Age display (c9bc78908d6549087ad19529f564120084279e74) - Tallest person comparison (d1a6ae5d88a3fffd0f54249e4f0feb7903213ccf) Major bugs fixed (summary): - Edge-case handling improvements in numeric comparisons and division-based calculations to ensure correctness across all input ranges. - Substring detection logic corrected for containment checks and extraction accuracy. - UI consistency improved by removing ads and clarifying output formatting, reducing user confusion. Overall impact and accomplishments: - Significantly expanded the practice problem library, enabling broader coverage of numeric, string, and UI-oriented tasks with reliable, testable code paths. - Improved user experience and learning outcomes through UI optimization and robust algorithm implementations. - Demonstrated end-to-end capability to design, implement, and verify a wide spectrum of algorithmic features within a single repository. Technologies/skills demonstrated: - Algorithm design and problem-solving across numeric theory, string processing, and arithmetic. - Modular, testable development with multi-commit iterations and clear commit traceability. - UI/UX improvements and user-centric feature refinements. - End-to-end feature delivery, validation, and documentation-oriented reporting.
January 2025
21 Commits • 8 Features
Jan 1, 2025Monthly summary for 2025-01: CODE-U-S/Coding_Test_Study — Implemented a broad batch of coding problems across Level 0 and Level 1, delivering robust algorithm solutions and repository scaffolding that enhance assessment readiness and code reuse. The work emphasizes core algorithmic skills and practical utilities across numeric operations, string handling, and array processing.
21 Commits • 8 Features
Jan 1, 2025Monthly summary for 2025-01: CODE-U-S/Coding_Test_Study — Implemented a broad batch of coding problems across Level 0 and Level 1, delivering robust algorithm solutions and repository scaffolding that enhance assessment readiness and code reuse. The work emphasizes core algorithmic skills and practical utilities across numeric operations, string handling, and array processing.
January 2025
December 2024
20 Commits • 3 Features
Dec 1, 2024December 2024 (Month: 2024-12) — Focused on stabilizing and accelerating the CODE-U-S/Coding_Test_Study repository while laying groundwork for upcoming Programmers platform challenges. Delivered three core areas: Codebase Restructuring and Cleanup, Core Problem Solutions for Programmers Platform, and Problem Setup and Placeholders for future challenges. No high-severity bugs reported this month; primary improvements centered on codebase hygiene, scalable boilerplate, and robust problem scaffolding. These efforts reduce technical debt, accelerate onboarding, and enable faster feature delivery with clearer ownership and maintainability.
December 2024
20 Commits • 3 Features
Dec 1, 2024December 2024 (Month: 2024-12) — Focused on stabilizing and accelerating the CODE-U-S/Coding_Test_Study repository while laying groundwork for upcoming Programmers platform challenges. Delivered three core areas: Codebase Restructuring and Cleanup, Core Problem Solutions for Programmers Platform, and Problem Setup and Placeholders for future challenges. No high-severity bugs reported this month; primary improvements centered on codebase hygiene, scalable boilerplate, and robust problem scaffolding. These efforts reduce technical debt, accelerate onboarding, and enable faster feature delivery with clearer ownership and maintainability.
November 2024
19 Commits • 4 Features
Nov 1, 2024In 2024-11, delivered a cohesive set of Programmer's Challenge solutions and codebase improvements in CODE-U-S/Coding_Test_Study. Features span largest-number and array utilities, string and text transformations, and core array/math algorithms, complemented by deliberate codebase maintenance and scaffolding for upcoming problems. Impact includes new reusable problem-solving utilities, higher code quality, and a stronger foundation for rapid future delivery. No explicit high-severity bugs documented this month; refactors and scaffolding reduce regression risk and improve maintainability.
19 Commits • 4 Features
Nov 1, 2024In 2024-11, delivered a cohesive set of Programmer's Challenge solutions and codebase improvements in CODE-U-S/Coding_Test_Study. Features span largest-number and array utilities, string and text transformations, and core array/math algorithms, complemented by deliberate codebase maintenance and scaffolding for upcoming problems. Impact includes new reusable problem-solving utilities, higher code quality, and a stronger foundation for rapid future delivery. No explicit high-severity bugs documented this month; refactors and scaffolding reduce regression risk and improve maintainability.
November 2024
Activity
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Quality Metrics
Correctness71.0%
Maintainability70.6%
Architecture69.2%
Performance70.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
CC++GitignoreJavaJavaScriptMarkdownPythonSQLText
Technical Skills
AlgorithmAlgorithm DesignAlgorithm ImplementationArray ManipulationArray ProcessingBackend DevelopmentBasic ArithmeticBasic JavaBasic MathBasic ProgrammingBasic Programming ConstructsBasic ScriptingBigIntegerCode CleanupCode Organization
Repositories Contributed To
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