This is a new editorial attempt. Only Two Principles.
Principle 1: Prior Knowledge is Important
Principle 2: Less Text, Even None
Good ExamplesIKEA Furniture Assembly Manual[1](
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Prove that the arithmetic mean is greater than the geometric mean
1586F (2500)
Prior Knowledge The statement.
What is a directed graph.
What is an $$$x$$$-base number.
Important definition $$$k$$$: in the constructed scheme, the length of the path with the same color cannot exceed $$$k$$$.
(Somehow CF doesn't support GIF images, so I can only provide the website address. I hope this can be fixed.)
1896F (2600)
Prior Knowledge The statement.
What is a regular (balanced) bracket sequence.
Important definition $$$s$$$: the given binary string in the statement.
Important definition $$$n$$$: the length of $$$s$$$ (which is a bit different from the original statement).
Important definition $$$ans_i$$$: Several regular bracket strings of length $$$n$$$, as your output answer.