ACM ICPC IMPORTANT TOPICS FOR THE ONLINE AND ONSITE CONTEST.
ACM ICPC questions difficulty level of any problem is inversely proportional to the amount of practice you have done. Knowing just the basics of programming won’t be fruitful for aspirants of ACM ICPC.
You need to have knowledge of advanced algorithms and data structures.
The link below should help you with your question :
Important Topics for ICPC