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The same idea
By 0xEssam, history, 13 months ago, In English

why the author of today's div2-912 round use the same idea of an old problem

to day's problem : https://mirror.codeforces.com/contest/1903/problem/C

the old problem : https://mirror.codeforces.com/contest/1175/problem/D

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13 months ago, # |
  Vote: I like it -8 Vote: I do not like it

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13 months ago, # |
  Vote: I like it 0 Vote: I do not like it

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13 months ago, # |
  Vote: I like it +23 Vote: I do not like it

why the author of today's div2-912 round use the same idea of an old problem

Because...they didn't know that a similar idea had appeared before? It's impossible to go through all previous competitive programming problems to see if some problem is original. Sometimes we end up with repeated or almost repeated problems, there's not much that can be done about it. Or do you have a good solution on how to avoid this?

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13 months ago, # |
← Rev. 2   Vote: I like it +13 Vote: I do not like it

Cringe! That edu is a 4 years ago. Coincidences can normally happen :-)

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