Rewrite io + Enable CI #6
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* WIP: work in progress
It doesn't make a big difference to call try_flush with a slightly larger amount than strictly necessary, as the actual flush call only happens rarely. Performance on Baekjoon Online Judge 11003 does not regress with this simplification.
This is validated on Baekjoon Online Judge 3745.
`word` reads a single word delimited by ASCII whitespace characters (value at most 0x20) into a prespecified buffer. If the user-supplied buffer is too short, reading stops and function returns. On the other hand, `word_string` uses dynamic allocation and thus is capable of reading arbitrarily long words.
Note that we can call `Writer::str` with `&String` references, as String implements the `Deref` trait to `str`, allowing the type coercion `&String -> &str`.
The ryu crate is basically a faster version of the dtoa crate, with a similar set of APIs (both crates are written by the same author). Ryu is a fast float-to-string conversion algorithm described in an PLDI'18 paper by Ulf Adams. See: https://dl.acm.org/doi/10.1145/3192366.3192369
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This reverts commit c12caeb.
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