Hi - a beginner here who is trying to coach his 8th grader for CP. I wanted to know the difficulty level of ZCO as compared to Codeforces Div2 A/B/C/D/E level. I understand the ZCO difficulty level could be changing from year to year. I just wanted to get a ballpark estimate so that I know where my son needs to be by December 2019. (he just finished all the Div 2A problems listed on "junior training sheet" by one Dr. Mostafa). Hope to get a response from more experienced people here.
Hi - this is my first post here. I wanted to check if there is any math book that directly covers the material tested in ZIO. I am coaching my son who is in the 8th grade and would like to comprehensively cover the math involved in ZIO. He is already doing the AOPS Introductory series (towards his preparation for PRMO).