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Some rounds are balanced, and some rounds are ludicrously not.
Some div 2A's are overly trivial, which is kind of expected, but have you ever come across a div 2A that was wildly and unexpectedly difficult for its position in the contest?
Let us know in the comments below!
I don't remember the contest id but that round was one of the hardest round . As starting problem was 1500 rated. A div2A problem having rating equals to C's problem rating is insane for a div2 round.
I remember this hard round. Fits your description.
This was the Exact round i was talking about !! Both A and B are 1500 rated
Your and mine rating are syncing right now !!
Two Substrings
This Div2A is one of my favs! https://mirror.codeforces.com/contest/1581/problem/A
There was a problem, I don't remember it was A or B, but I liked it.
So problem is:
You are given integers $$$A$$$, $$$B$$$, $$$R$$$, each of them is $$$<=100$$$, Alice and Bob are playing a game, Alice makes first move, then Bob makes second and so on. On each move, a players puts a circle with radius R on a rectangle $$$A * B$$$, this circle can't intersect with any other placed circle. A player loses if he/she can't put a circle. You have to determine who will win.
Solution:
If Alice can place a circle on her first move, she wins.
Why is the solution correct?
She can play symmetrically.
You can play a circle on the middle, and then play symmetrically wrt the center.
maybe this https://mirror.codeforces.com/contest/200/problem/A
182A - Battlefield and 200A - Cinema
iirc cinema is from dynamic scoring round.
Both of them are.
2400 rated problem for div 2A is insane
If we ignore rounds with dynamic scoring then one of 374A - Inna and Pink Pony, 625A - Guest From the Past, 305A - Strange Addition, 430A - Points and Segments (easy) and 518A - Vitaly and Strings.
pizzaforces and antiknapsack are literally impossible
Anti-knapsack 2 was also proposed as a Div2A on Codeforces (rejected because too hard).
Can't say anything about Div2A, but the first Codeforces round I've participated in had an atrociously difficult Div2B.
https://mirror.codeforces.com/problemset/problem/1635/A
Anti-knapsack
https://mirror.codeforces.com/contest/1536/problem/A
This One
305A — Strange Addition from round 184