ssafy16codingteststudy/1st_algorithm
Apr 2025 – Apr 2025
1 Month active
Languages Used
Java
Technical Skills
AlgorithmAlgorithmsBreadth-First SearchCompetitive ProgrammingData StructuresDepth First Search (DFS)
Geonhwi Park
PROFILE
Geonhwi Park
Contributed to the ssafy16codingteststudy/1st_algorithm repository by developing twelve algorithmic features focused on efficient problem-solving and data structure implementation in Java. Delivered solutions such as segment tree range queries, DFS-based tree recoloring, and KMP string matching, emphasizing both performance and code maintainability. Applied techniques including greedy algorithms, breadth-first search, and two-pointer methods to address a variety of competitive programming challenges. Enhanced code readability through consistent naming and selective refactoring, while ensuring correctness and speed across all submissions. No critical bugs were reported, allowing for concentrated efforts on expanding the repository’s breadth in algorithms, data structures, and optimization strategies.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
16Total
Bugs
0
Commits
16
Features
12
Lines of code
863
Activity Months1
Your Network
15 peopleWork History
April 2025
16 Commits • 12 Features
Apr 1, 2025April 2025 performance summary for ssafy16codingteststudy/1st_algorithm focused on delivering robust algorithmic solutions across a broad set of BOJ problems and data-structure implementations. Achievements spanned advanced data structures, pattern matching optimizations, and efficient problem-solving workflows, reinforcing both speed and correctness in algorithmic practice and education. Key features delivered: - Segment Tree Range Queries: Implemented a segment tree to support range counting (even/odd) along with range min/max queries and point updates, enabling fast analytics on large datasets. - DFS-based Tree Recolor (BOJ 24230): Implemented coloring of a tree via DFS to satisfy recolor constraints with linear-time traversal. - Kadane-based Max Subarray with Flips (BOJ 25634): Calculated maximum sum obtainable by flipping a contiguous subsegment of bulb statuses. - Huffman-like File Merging (BOJ 13975): Used a priority queue to merge smallest files, minimizing total merge cost. - BFS-based Pile Equalization (BOJ 12886): BFS approach to determine if three piles can be made equal under allowed operations. - KMP-based Search (BOJ 1786) and Prefix-Suffix Optimization (BOJ 16900): Implemented KMP pattern matching and string optimizations for faster searches. - Problem Collection Manager (BOJ 21939): Managed problems by difficulty with add, report/recommend, and solved operations. - Web Browser History with Deques: Simulated back/forward navigation with duplicates compression for cleaner history. - Grid Path Planning (BOJ 25319): Calculated how many times a string can be formed by collecting grid characters with planned moves. - Two Sum Closest to Zero (BOJ 2470): Two-pointer solution with and without renaming for file consistency. - Remote Control Constraint Handling (BOJ 1107): Explored channel options and minimized button presses considering broken digits. - Greedy Solutions (BOJ 13164 & 19598): Implemented greedy strategies for grouping and meeting-room scheduling. Major bugs fixed: - No explicit critical bugs reported in the provided data for this month. Focus remained on feature delivery and code quality improvements across algorithms. Overall impact and accomplishments: - Expanded the repository’s problem-solving breadth across data structures, algorithms, and optimization strategies, enabling faster, correct solution delivery for a wide set of challenges. - Improved maintainability and readability through consistent naming and selective refactors across multiple problems. - Strengthened practical software engineering skills (testing, validation, and performance considerations) inside competitive programming workflows. Technologies/skills demonstrated: - Data structures: Segment tree, priority queue, BFS, deques - Algorithms: Kadane, KMP, two-pointer, greedy, DFS - Patterns: Reuse of standard templates, problem-solving pattern recognition, and refactoring for clarity - Tools and concepts: Performance optimization, code readability, and maintainability in a multi-problem codebase.
16 Commits • 12 Features
Apr 1, 2025April 2025 performance summary for ssafy16codingteststudy/1st_algorithm focused on delivering robust algorithmic solutions across a broad set of BOJ problems and data-structure implementations. Achievements spanned advanced data structures, pattern matching optimizations, and efficient problem-solving workflows, reinforcing both speed and correctness in algorithmic practice and education. Key features delivered: - Segment Tree Range Queries: Implemented a segment tree to support range counting (even/odd) along with range min/max queries and point updates, enabling fast analytics on large datasets. - DFS-based Tree Recolor (BOJ 24230): Implemented coloring of a tree via DFS to satisfy recolor constraints with linear-time traversal. - Kadane-based Max Subarray with Flips (BOJ 25634): Calculated maximum sum obtainable by flipping a contiguous subsegment of bulb statuses. - Huffman-like File Merging (BOJ 13975): Used a priority queue to merge smallest files, minimizing total merge cost. - BFS-based Pile Equalization (BOJ 12886): BFS approach to determine if three piles can be made equal under allowed operations. - KMP-based Search (BOJ 1786) and Prefix-Suffix Optimization (BOJ 16900): Implemented KMP pattern matching and string optimizations for faster searches. - Problem Collection Manager (BOJ 21939): Managed problems by difficulty with add, report/recommend, and solved operations. - Web Browser History with Deques: Simulated back/forward navigation with duplicates compression for cleaner history. - Grid Path Planning (BOJ 25319): Calculated how many times a string can be formed by collecting grid characters with planned moves. - Two Sum Closest to Zero (BOJ 2470): Two-pointer solution with and without renaming for file consistency. - Remote Control Constraint Handling (BOJ 1107): Explored channel options and minimized button presses considering broken digits. - Greedy Solutions (BOJ 13164 & 19598): Implemented greedy strategies for grouping and meeting-room scheduling. Major bugs fixed: - No explicit critical bugs reported in the provided data for this month. Focus remained on feature delivery and code quality improvements across algorithms. Overall impact and accomplishments: - Expanded the repository’s problem-solving breadth across data structures, algorithms, and optimization strategies, enabling faster, correct solution delivery for a wide set of challenges. - Improved maintainability and readability through consistent naming and selective refactors across multiple problems. - Strengthened practical software engineering skills (testing, validation, and performance considerations) inside competitive programming workflows. Technologies/skills demonstrated: - Data structures: Segment tree, priority queue, BFS, deques - Algorithms: Kadane, KMP, two-pointer, greedy, DFS - Patterns: Reuse of standard templates, problem-solving pattern recognition, and refactoring for clarity - Tools and concepts: Performance optimization, code readability, and maintainability in a multi-problem codebase.
April 2025
Activity
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Quality Metrics
Correctness97.6%
Maintainability82.6%
Architecture83.8%
Performance95.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Java
Technical Skills
AlgorithmAlgorithmsBreadth-First SearchCompetitive ProgrammingData StructuresDepth First Search (DFS)Dynamic ProgrammingFile ManagementGreedy AlgorithmGrid TraversalHashMapJavaKMP AlgorithmKadane's AlgorithmPriority Queue
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