In this roadmap, I'll guide you through Codeforces problems rated -. You'll work on bitmask DP, segment trees with lazy propagation, bridge finding, number theory, and constructive algorithms.
Each section gives you a pattern, then walks through problems so you fully understand how to apply it. We solve problems exclusively from Codeforces. These are contest problems that test your ability to combine multiple ideas under time pressure.
By the end, you'll handle Codeforces Div C-D and Div A-B problems with confidence.