twangal's blog

By twangal, history, 3 weeks ago, In English,

Original comment:

How to solve "2019-2020 ACM-ICPC Pacific Northwest Regional Contest" problem H pivoting point?

Particularly, there's a "" in the official solution package [1]. Its logic looks much simpler than the editorial, but I don't understand why it works. Meanwhile, a bunch of submissions seem to follow the same logic. Could somebody explain it to me? In particular, what does [left] and [rep] mean?


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