Understand Python String Slicing in One Minute
A beginner-friendly Python note on word[1:4], include start, exclude stop, and slicing boundaries.
Python Learning Notes
AI Literacy Articles, Programming Education
Do Informatics Competitions Still Matter in the AI Era?
Do informatics competitions still matter when AI can write code? This guide explains their value for problem reading, modeling, algorithm choice, complexity, debugging, verification, and healthy learning.
CP Weekly Challenge
CCC 2020 J5/S2 Escape Room Solution: BFS on an Implicit Graph
Learn how to solve Escape Room with BFS on an implicit graph, product-to-cells indexing, and visited-value optimization in Python and C++.
AI Literacy Articles, Programming Education
What Skills Should Students Build in the AI Era?
What should students learn when AI tools are getting stronger? This guide explains durable AI-era skills: problem definition, computational thinking, verification, communication, creativity, responsibility, and continuous learning.
Python Learning Notes
What Is the Difference Between = and == in Python?
A beginner-friendly Python note on assignment, equality comparison, and writing correct if conditions.
CP Weekly Challenge
CCC 2021 J5/S2 Modern Art Solution: Count Gold Cells with Parity
Learn how to solve Modern Art with parity, row and column toggling, and an O(M + N + K) counting formula in Python and C++.
AI Literacy Articles, Programming Education
Why Python Is Still a Strong First Programming Language in the AI Era
If AI can generate code, why should students still start with Python? This guide explains Python’s value for readability, feedback, debugging, algorithms, and AI-era learning.
Python Learning Notes
Variables Are Not Boxes; They Are More Like Labels
A beginner-friendly Python note on understanding variables as names that point to objects.
Python Learning Notes
print() Is More Than Hello World
A beginner-friendly Python note on using sep and end to control output formatting.
CP Weekly Challenge
CCC 2025 J4 Sunny Days Solution: Longest Sunny Streak After One Fix
Learn how to solve Sunny Days with prefix and suffix streak counts, one-day correction logic, and Python/C++ implementations.