80 lines
2.3 KiB
Rust
80 lines
2.3 KiB
Rust
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// Copyright 2023 Christian Ulrich
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// usage: ./part2 < input
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use std::io;
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pub struct CalibrationValues {
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inner: Vec<u32>,
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}
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impl CalibrationValues {
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pub fn from_stdin(tokens: &[(&str, u32)]) -> Result<Self, &'static str> {
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let mut values = vec![];
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for line in io::stdin().lines() {
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let line = line.unwrap();
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let mut matches = Vec::new();
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for (token, value) in tokens.iter() {
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match line.find(token) {
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Some(pos) => matches.push((pos, value)),
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None => (),
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}
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match line.rfind(token) {
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Some(pos) => matches.push((pos, value)),
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None => (),
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}
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}
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if matches.len() > 0 {
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matches.sort_by_key(|(pos, _)| *pos);
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let first = matches.first().unwrap().1;
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let last = matches.last().unwrap().1;
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values.push(first * 10 + last);
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}
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}
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Ok(Self { inner: values })
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}
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pub fn iter(&mut self) -> std::slice::Iter<'_, u32> {
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self.inner.iter()
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}
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}
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fn main() -> Result<(), &'static str> {
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let tokens = [
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("1", 1),
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("2", 2),
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("3", 3),
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("4", 4),
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("5", 5),
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("6", 6),
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("7", 7),
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("8", 8),
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("9", 9),
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("one", 1),
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("two", 2),
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("three", 3),
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("four", 4),
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("five", 5),
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("six", 6),
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("seven", 7),
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("eight", 8),
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("nine", 9),
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];
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let mut values = CalibrationValues::from_stdin(&tokens[..])?;
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println!("{}", values.iter().sum::<u32>());
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Ok(())
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}
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