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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Auto comment: topic has been updated by 0xEssam (previous revision, new revision, compare).
Auto comment: topic has been updated by 0xEssam (previous revision, new revision, compare).
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?
Cringe! That edu is a 4 years ago. Coincidences can normally happen :-)