CP Weekly Challenges

Weekly CCC contest problem analysis with thinking process, Python/C++ solutions, common mistakes, and learning outcomes.

Channel Archive

Latest articles in this channel.

Browse the newest resources first, then open any article for the full explanation and practice notes.

CP Weekly Challenge | September 3, 2026

Learn how to solve Escape Room with BFS on an implicit graph, product-to-cells indexing, and visited-value optimization in Python and C++.

CP Weekly Challenge | August 25, 2026

Learn how to solve Modern Art with parity, row and column toggling, and an O(M + N + K) counting formula in Python and C++.

CP Weekly Challenge | July 30, 2026

Learn how to solve Sunny Days with prefix and suffix streak counts, one-day correction logic, and Python/C++ implementations.

CP Weekly Challenge | July 26, 2026

Use dynamic programming, local neighbor transitions, and rolling arrays to find the minimum-cost path through a repeating-cost grid.

CP Weekly Challenge | July 19, 2026

Use sparse tree coordinates, candidate top-left corners, and careful shrinking to find the largest empty square.

CP Weekly Challenge | July 4, 2026

Use grid search, direction vectors, and one right-angle bend to count every hidden occurrence of a word.

CP Weekly Challenge | September 11, 2026

Learn how to solve CCC 2024 J5 Harvest Waterloo with flood fill, BFS, connected components, and grid accumulation in Python and C++.

CP Weekly Challenge | June 1, 2026

Simulate the snail step by step, track slimy squares with a visited set, and count every revisit.

Read Full Article

CP Weekly Challenge | May 31, 2026

Use interval coverage, a difference array, and prefix sums to answer illumination queries efficiently.

Read Full Article

Explore CP Weekly Challenges, Python Learning Notes, and AI Literacy Articles from one place.

Related Learning

These related pages help students and parents move from interest to the right next step.