chokudai's blog

AtCoder Beginner Contest 281 Announcement
By chokudai, history, 16 months ago, In English

We will hold AtCoder Beginner Contest 281.

The point values will be 100-200-300-400-500-500-600-600.

We are looking forward to your participation!

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16 months ago, # |
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how to solve d?

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16 months ago, # |
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Problem F is same as: 1285D - Dr. Evil Underscores

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    16 months ago, # ^ |
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    Lol, I was happy that I solved it in 6 minutes. Now, I have realized I solved the same one a few years ago.

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16 months ago, # |
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E is easier than D, for people who are less comfortable with DP.

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16 months ago, # |
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Great Round! solved A-F for the first time :3

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16 months ago, # |
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Got TLE on E using 2 multisets, anyone got AC with this approach please share their solution

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    16 months ago, # ^ |
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    Same happened with me. Had to use ordered sets to pass.

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    16 months ago, # ^ |
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    My submission uses 2 multisets.

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    16 months ago, # ^ |
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    here

    hope that helps

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      16 months ago, # ^ |
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      I checked both of your submissions (You and the comment above) but did not find any significant differences than my implementation, dont know whats the issue

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        16 months ago, # ^ |
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        notice that when m==k, s2 will always be empty, so s2.erase(s2.begin()); in line76 can cause an error.

        here is my quick fix. no tle, but get a re... so there remains something to fix

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          16 months ago, # ^ |
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          Thanks for the reply found out that deleting from an empty set was the issue. Though I did not except a TLE for that, if got RE then would have thought in that direction

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        16 months ago, # ^ |
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        I used two multisets and it worked.

        https://atcoder.jp/contests/abc281/submissions/37191709

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    16 months ago, # ^ |
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    Your explain in D in ur video is good enough, thank u.

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    16 months ago, # ^ |
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    I checked your submission, your implementation is incorrect (I did the same thing without those bugs and it passes under 200ms). Hint 1:- Check for m = 1, Hint 2:- count() takes O(f + logn) time where f is the frequency of the searched element.

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      16 months ago, # ^ |
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      Thanks got it now. It was the case for handling empty sets for M=1, never thought of it as was not expecting TLE because of that. Thanks again

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16 months ago, # |
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Any idea why this is giving a wrong answer on the samples? https://atcoder.jp/contests/abc281/submissions/37185737 Replacing min with max for some reason passes the samples (however not the system tests), but min seems more appropriate.

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16 months ago, # |
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AtCoder founder and CEO guided ChatGPT to take part in ABC281 virtually. The result is that only A,B,C,D are completed. YouTube link.

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