58 lines
1.7 KiB
Rust
58 lines
1.7 KiB
Rust
|
// Copyright 2023 Christian Ulrich
|
||
|
|
//
|
||
|
|
// This program is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU General Public License as published by
|
||
|
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
|
// (at your option) any later version.
|
||
|
|
//
|
||
|
|
// This program is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU General Public License for more details.
|
||
|
|
//
|
||
|
|
// You should have received a copy of the GNU General Public License
|
||
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
//
|
||
|
|
// usage: ./part1 < input
|
||
|
|
|
||
|
|
use std::io;
|
||
|
|
|
||
|
|
pub struct CalibrationValues {
|
||
|
|
inner: Vec<Vec<char>>,
|
||
|
|
}
|
||
|
|
|
||
|
|
impl CalibrationValues {
|
||
|
|
pub fn from_stdin() -> Result<Self, &'static str> {
|
||
|
|
let mut values = vec![];
|
||
|
|
for line in io::stdin().lines() {
|
||
|
|
let digits = line
|
||
|
|
.unwrap()
|
||
|
|
.chars()
|
||
|
|
.filter(|c| c.is_digit(10))
|
||
|
|
.collect::<Vec<_>>();
|
||
|
|
if digits.len() > 0 {
|
||
|
|
values.push(digits);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
Ok(Self { inner: values })
|
||
|
|
}
|
||
|
|
|
||
|
|
pub fn iter(&mut self) -> std::slice::Iter<'_, Vec<char>> {
|
||
|
|
self.inner.iter()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() -> Result<(), &'static str> {
|
||
|
|
let mut values = CalibrationValues::from_stdin()?;
|
||
|
|
let mut sum = 0;
|
||
|
|
for digits in values.iter() {
|
||
|
|
sum += [*digits.first().unwrap(), *digits.last().unwrap()]
|
||
|
|
.iter()
|
||
|
|
.collect::<String>()
|
||
|
|
.parse::<u32>()
|
||
|
|
.map_err(|_| "cannot parse calibration value")?;
|
||
|
|
}
|
||
|
|
println!("{sum}");
|
||
|
|
Ok(())
|
||
|
|
}
|