Want to climb rating fast? Here’s the simplest 10-topic roadmap that actually works:

Basic Programming (Fast I/O, loops, vectors, strings) Greedy Binary Search Two Pointers Sorting + Simple Math (GCD, modulo) Prefix Sums / Difference Arrays Basic 1D DP Graphs – BFS + DFS Number Theory (Sieve, primes, modular inverse) Basic Data Structures (Stack, Queue, Set, Map, Priority Queue)

Fastest Practice Plan:

1 topic per week Solve only 800–1200 rated problems Focus on Div.2 A → B → C (then D)

Start here: https://codeforces.me/problemset?tags=800-1200&order=problem_rating_ASC Follow this and you can go Newbie → Pupil → Specialist → Expert in just 3–6 months!