Last year around March , I started competitive programming . I managed to learn the basics in Data structures and Algorithms. But I left graphs and Trees. Also, Im not great at DP. When I grabbed an intern in September , I stopped coding since then. I restarted coding from the last 3 days. But those leftover parts are scaring me. I couldn't even open a problem to solve. Im preparing for my college placements in this August. Please help me where to learn and how to learn those Graphs and DP algos. Thanks .