Kees van Kempen
1c17fcede7
This is wrong, though, as cases like `oneight` should return `83` whereas I replace the `one`s first, so that `1ight` will remain that way. See <https://www.reddit.com/r/adventofcode/comments/1884fpl/2023_day_1for_those_who_stuck_on_part_2/>.
66 lines
1.5 KiB
Rust
66 lines
1.5 KiB
Rust
use std::fs::File;
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use std::io::{self, BufRead};
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use std::path::Path;
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fn main() {
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let mut sum = 0;
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let mut mus = 0;
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if let Ok(lines) = read_lines("./input") {
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for line in lines {
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if let Ok(text) = line {
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// TODO: Please us something like a collection instead of
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// hardcoding every replacement.
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let sanitext = text
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.replace("one", "1")
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.replace("two", "2")
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.replace("three", "3")
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.replace("four", "4")
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.replace("five", "5")
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.replace("six", "6")
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.replace("seven", "7")
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.replace("eight", "8")
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.replace("nine", "9")
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;
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// DEBUG:
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println!(
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"{} => {} yields {} + {} = {}",
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text,
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sanitext,
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first_digit(&sanitext),
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last_digit(&sanitext),
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first_digit(&sanitext) + last_digit(&sanitext)
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);
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sum = sum + first_digit(&sanitext);
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mus = mus + last_digit(&sanitext);
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} else {
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println!("Error on line \"{:?}\"", line);
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}
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}
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}
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println!("{}", 10*sum + mus);
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}
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// TODO: Switch to Option(i32) to allow not having a digit in text <https://doc.rust-lang.org/std/option/>.
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fn first_digit(text: &String) -> i32 {
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for c in text.chars() {
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if c.is_digit(10) {
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return c.to_digit(10).unwrap() as i32;
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}
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}
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// TODO: What if there is no digit?
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0
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}
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fn last_digit(text: &String) -> i32 {
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let txet = &mut text.chars().rev().collect();
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first_digit(txet)
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}
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fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
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where P: AsRef<Path>, {
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let file = File::open(filename)?;
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Ok(io::BufReader::new(file).lines())
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}
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