Sometimes i find a high rating question very easy like G1 (https://codeforces.me/contest/1840/problem/G1) of round 878 div 3 but its rating is 2200. sometimes a low rating question like (https://codeforces.me/problemset/problem/1773/F) takes too much time . how they decide rating of question , on their own perspective or number of participate solve that question in contest. their question rating system is too much confusing.
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It depends on rating of people who solved it and their number. I don't know the exact formula, but it's based on the fact the x-rated people have 50% chance of solving a x-rated problem. That's why you might find an easy 2200 rated div3g1. Not many people get to it so it gets higher rating