I'm unable to solve any medium problem!

I’m able to solve Easy questions without any issues I’ve solved about 35 question(in order of most submitted) and 5 question from less submitted section, but I was unable to solve very first problem of Medium section, The bytelandian gold coin. I looked it up on YouTube, a guy was telling to use Dynamic Programming, I didn’t know what the hell it was! then I realized I just know DS not DSA. I looked up things like DP,Sorting,Z-algo,KMP,Hashing,backtracking,greedy algos,etc I want to learn them in very organized manner. Please help me find good resource(must be free and must show implementation in c++) so that I can learn algos and can solve Medium/hard section of Codechef :slight_smile:

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Check CCDSAP Prepare section.