ChaosAngel's blog

What was the Hardest Div 2A you've seen?
By ChaosAngel, history, 2 years ago, In English

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!

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Comments Comments (24)
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2 years ago, # |
  Vote: I like it +5 Vote: I do not like it

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.

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2 years ago, # |
  Vote: I like it +17 Vote: I do not like it

Two Substrings

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2 years ago, # |
  Vote: I like it +12 Vote: I do not like it

This Div2A is one of my favs! https://mirror.codeforces.com/contest/1581/problem/A

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2 years ago, # |
  Vote: I like it +5 Vote: I do not like it

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:

Spoiler
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2 years ago, # |
  Vote: I like it +16 Vote: I do not like it

maybe this https://mirror.codeforces.com/contest/200/problem/A

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2 years ago, # |
  Vote: I like it 0 Vote: I do not like it

182A - Battlefield and 200A - Cinema

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2 years ago, # |
  Vote: I like it +11 Vote: I do not like it

pizzaforces and antiknapsack are literally impossible

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2 years ago, # |
  Vote: I like it +14 Vote: I do not like it

Can't say anything about Div2A, but the first Codeforces round I've participated in had an atrociously difficult Div2B.

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2 years ago, # |
  Vote: I like it -14 Vote: I do not like it

https://mirror.codeforces.com/problemset/problem/1635/A

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2 years ago, # |
  Vote: I like it +8 Vote: I do not like it

Anti-knapsack

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2 years ago, # |
  Vote: I like it 0 Vote: I do not like it

https://mirror.codeforces.com/contest/1536/problem/A

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2 years ago, # |
  Vote: I like it 0 Vote: I do not like it

This One

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2 years ago, # |
  Vote: I like it 0 Vote: I do not like it

305A — Strange Addition from round 184

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