1900_mashups's blog

By 1900_mashups, history, 3 years ago, In English

hello codeforces,

i am glad to invite you all to my practice mashups, which i am going to start from tomorrow.
it is mainly prepared for those who aspire to become masters (be it candidates, experts, div 2 guys, div 3 guys, div 4 guys, or even an inactive master). so, the mashups will have mostly 1900+ rated problems.
i will share the mashup links through the comments of this blog, so that everyone can access it.

excited to see you guys at the standings.

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3 years ago, # |
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Thanks

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3 years ago, # |
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the third practice mashup will start on 8th July 2022, today at 10:35 UTC.

number of problems: 3
duration of mashup: 1:30 hrs
ratings of problems: 800, 1600, 1900

registration is open.

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    3 years ago, # ^ |
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    So are you just picking any problem of given difficulty or hand-picking problems?

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

Nice initiative. I liked ADE2.

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2 years ago, # |
Rev. 2   Vote: I like it +3 Vote: I do not like it

ADE (3) practice mashup will start on 12 July 2022 at 5:35 UTC.

number of problems: 3
duration of mashup: 2:30 hrs
ratings of problems: 800, 1900, 2000

UPD: registration is open;

PS: my intern drive is ongoing, so i wasn't preparing mashups for few days.

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

ADE (9) practice mashup will start on 3rd August 2022 at 10:05 UTC (15:35 IST).

number of problems: 3
duration of mashup: 2:30 hrs
ratings of problems: 800, 1900, 2000

registration is open;

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

ADE (10) Practice Mashup will start on 5th August 2022 at 10:05 UTC (15:35 IST).

Problems count: 3
Duration: 2:30 hrs
Ratings of problems: 800, 1900, 2000

Registration link: https://mirror.codeforces.com/contestInvitation/5c3004a99447d5cd5d870fb59112e4d13dd0c274

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2 years ago, # |
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ADE (11) Practice Mashup will start on 9th August 2022 at 09:35 UTC (15:05 IST).

Count of problems: 3
Duration: 2:30 hrs
Ratings of problems: 800, 1900, 2000

Registration link: https://mirror.codeforces.com/contestInvitation/361449889e11b8e91fdc90247d09ee30f76948f1

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

ADE (12) Practice Mashup will start on 10th August 2022 at 10:05 UTC (15:35 IST).

Count of problems: 3
Duration: 2:30 hrs
Ratings of problems: 800, 1900, 2000

Registration link: https://mirror.codeforces.com/contestInvitation/54cd64d50d981b42a253ac7414f7e9541c024cf8

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2 years ago, # |
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Today's (28th Nov 22) practice mashup will start at 05:35 UTC (11:05 IST).

Count of problems: 3
Duration: 2:30 hrs
Ratings of problems: 800, 1900, 2000

Registration link: https://mirror.codeforces.com/contestInvitation/3bb9cb14905201ab30618cafdc06f6808415167a

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2 years ago, # |
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Today's (3rd Dec 22) practice mashup will start at 06:35 UTC (12:05 IST).

Count of problems: 3
Duration: 2:00 hrs
Ratings of problems: 800, 1900, 2000

Registration link: https://mirror.codeforces.com/contestInvitation/090d848c8efd9489db266378175db6c1f8d462b4

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2 years ago, # |
  Vote: I like it +27 Vote: I do not like it

Glad to inform you guys, that I have finally became a master. Now, I don't know what to do next, maybe I could come up with a new blog "Mashups for aspiring IMs" ? Lol.

Do anyone of you have any other interesting ideas for me or the community ?

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2 years ago, # |
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can someone explain problem c of 11th Dec that why is the probability of a student who reads message mi
is ki/t if t>ki ?
shouldn't it be ncr(t,ki-1)/ncr(t,ki) where we are fixing the message which the ith student to read.
In question it was given all k sets are equiprobable but I couldn't understand why it is the reason for probability as ki/t ?
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    2 years ago, # ^ |
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    Sorry for late reply, but it's good you asked this. Actually, when you're fixing the message mi, then you have to choose rest ki1 messages out of t1 messages (note that total messages would also decrease by 1). So, the numerator in your formula was wrong.

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      2 years ago, # ^ |
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      Thanks for bringing me to peace with this question. Guess newbie things.. I mess up with indexing stuff

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      2 years ago, # ^ |
      Rev. 3   Vote: I like it +8 Vote: I do not like it

      Thanks great mashups for beg