Practice with AtCoder Roadmap

Phase	Main Topic	Content	Goal
1	Fundamentals	Choose Language (C++) Big O Notation Setup Environment	Master the language and fundamental knowledge to get started.
2	Gray → Brown (Rating < 800)	Participate in AtCoder Beginner Contests Basic Math & Strings Practice problems A, B	Get familiar with the platform and solve easy problems.
3	Brown → Green (800-1200)	Conquer problem C (ABC) Core Algorithms Practice Upsolving	Solve medium problems and learn core algorithms.
4	Green → Blue (1200-1600)	Conquer problem D (ABC) Educational DP Contest Data Structures (Union-Find, BIT) Participate in ARC	Master dynamic programming and basic data structures.
5	Blue → Yellow (1600-2000)	Advanced Algorithms Advanced Data Structures Practice ARC (B & C)	Solve hard problems with advanced techniques.
6	Yellow → Red (2000+)	Conquer AtCoder Grand Contest Specialized Topics Analyze Contests & Editorials	Compete at the highest level and gain deep insight into problems.

1

Fundamentals

Master the language and fundamental knowledge to get started.

2

Gray → Brown (Rating < 800)

Get familiar with the platform and solve easy problems.

3

Brown → Green (800-1200)

Solve medium problems and learn core algorithms.

4

Green → Blue (1200-1600)

Master dynamic programming and basic data structures.

5

Blue → Yellow (1600-2000)

Solve hard problems with advanced techniques.

6

Yellow → Red (2000+)

Compete at the highest level and gain deep insight into problems.