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51 lines
1.1 KiB
51 lines
1.1 KiB
2 years ago
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use linebuffer::{
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buf::forward,
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ParsedLines,
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};
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use std::{
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io,
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str,
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fs,
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};
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Default, Copy)]
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struct MaybeU64(Option<u64>);
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impl str::FromStr for MaybeU64
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{
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type Err = <u64 as str::FromStr>::Err;
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#[inline]
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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if s.is_empty() {
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Ok(Self(None))
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} else {
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Ok(Self(Some(s.parse()?)))
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}
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}
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}
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fn input_reader<R: io::Read>(input: R) -> ParsedLines<R, forward::FromStr<MaybeU64>>
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{
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ParsedLines::new(input)
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}
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fn main() -> Result<(), Box<dyn std::error::Error+ 'static>> {
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let mut reader = input_reader(fs::OpenOptions::new().read(true).open("input")?);
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let mut last_elf = 0;
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let mut max_elf = 0;
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while let Some(res) = reader.try_next()
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{
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match res.expect("Failed to parse line").0 {
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Some(value) => last_elf += value,
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None if last_elf > max_elf => {
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max_elf = std::mem::replace(&mut last_elf, 0);
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},
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_ => last_elf = 0,
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}
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}
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println!("{}", std::cmp::max(max_elf, last_elf));
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Ok(())
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}
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