Day 1
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a24d3134c0
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a13b049276
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@ -1,3 +1,5 @@
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use std::{collections::HashMap, iter::zip, num::ParseIntError, str::FromStr};
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use crate::prelude::*;
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mod prelude;
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@ -8,108 +10,57 @@ fn main() {
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struct Day1 {}
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impl Day1 {
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fn calibration_value(line: &str) -> i128 {
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println!("{line}");
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let bytes = line.as_bytes();
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let mut first_digit: Option<u8> = None;
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let mut last_digit: Option<u8> = None;
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for i in 0..bytes.len() {
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let n = bytes.len() - 1 - i;
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println!("{n} {i}");
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if first_digit.is_none() && (0x30..=0x39).contains(&bytes[i]) {
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first_digit = Some(bytes[i] - 0x30);
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println!("found first {first_digit:?}");
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fn smallests_distances(input: &str) -> i64 {
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let mut lefts = Vec::<i64>::new();
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let mut rights = Vec::<i64>::new();
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for l in input.lines() {
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let mut tokens = l.split(" ");
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lefts.push(tokens.next().unwrap().parse().unwrap());
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rights.push(tokens.next().unwrap().parse().unwrap());
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}
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if last_digit.is_none() && (0x30..=0x39).contains(&bytes[n]) {
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last_digit = Some(bytes[n] - 0x30);
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println!("found last {last_digit:?}");
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lefts.sort();
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rights.sort();
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let mut sum = 0;
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for (l, r) in zip(&lefts, &rights) {
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sum += (l - r).abs();
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}
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if first_digit.is_some() && last_digit.is_some() {
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break;
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}
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}
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println!("{:?} {:?}", first_digit, last_digit);
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Into::<i128>::into(first_digit.or(last_digit).unwrap() * 10)
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+ Into::<i128>::into(last_digit.or(first_digit).unwrap())
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sum
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}
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fn num_name(s: &[u8]) -> Option<u8> {
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for (i, w) in [
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"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
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]
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.map(|s| s.as_bytes())
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.iter()
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.enumerate()
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{
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if s.starts_with(w) {
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return Some(i as u8);
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fn similarity_score(input: &str) -> i64 {
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let mut lefts = Vec::<i64>::new();
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let mut rights: HashMap<i64, i64> = HashMap::new();
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for l in input.lines() {
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let mut tokens = l.split(" ");
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lefts.push(tokens.next().unwrap().parse().unwrap());
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let right: i64 = tokens.next().unwrap().parse().unwrap();
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match rights.get_mut(&right) {
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None => {
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rights.insert(right, 1);
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}
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Some(n) => {
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*n += 1;
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}
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return None;
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};
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}
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fn num_name_end(s: &[u8]) -> Option<u8> {
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for (i, w) in [
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"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
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]
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.map(|s| s.as_bytes())
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.iter()
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.enumerate()
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{
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if s.ends_with(w) {
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return Some(i as u8);
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let mut sum = 0;
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for l in &lefts {
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sum += (rights.get(l).unwrap_or(&0) * l)
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}
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}
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return None;
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}
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fn calibration_value_words(line: &str) -> i128 {
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println!("{line}");
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let bytes = line.as_bytes();
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let mut first_digit: Option<u8> = None;
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let mut last_digit: Option<u8> = None;
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for i in 0..bytes.len() {
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let n = bytes.len() - 1 - i;
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println!("NI: {n} {i}");
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if first_digit.is_none() {
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if (0x30..=0x39).contains(&bytes[i]) {
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first_digit = Some(bytes[i] - 0x30);
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println!("found first {first_digit:?}");
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} else if let Some(n) = Self::num_name(&bytes[i..]) {
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first_digit = Some(n);
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println!("found first text {first_digit:?}");
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}
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}
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if last_digit.is_none() {
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println!("{:?}", &bytes[..=n]);
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if (0x30..=0x39).contains(&bytes[n]) {
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last_digit = Some(bytes[n] - 0x30);
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println!("found last {last_digit:?}");
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} else if let Some(n) = Self::num_name_end(&bytes[..=n]) {
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last_digit = Some(n);
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println!("found last text {last_digit:?}");
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}
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}
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if first_digit.is_some() && last_digit.is_some() {
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break;
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}
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}
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println!("{:?} {:?}", first_digit, last_digit);
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Into::<i128>::into(first_digit.or(last_digit).unwrap() * 10)
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+ Into::<i128>::into(last_digit.or(first_digit).unwrap())
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sum
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}
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}
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impl AoCSolution for Day1 {
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type Input = String;
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type Solution = i128;
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type Solution = i64;
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fn part1(input: Self::Input) -> Self::Solution {
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input.lines().map(Self::calibration_value).sum()
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Day1::smallests_distances(&input)
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}
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fn part2(input: Self::Input) -> Self::Solution {
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input.lines().map(Self::calibration_value_words).sum()
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Day1::similarity_score(&input)
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}
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}
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@ -121,26 +72,27 @@ mod tests {
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fn test() {
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assert_eq!(
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Day1::part1(
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r#"1abc2
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pqr3stu8vwx
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a1b2c3d4e5f
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treb7uchet"#
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r#"3 4
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4 3
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2 5
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1 3
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3 9
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3 3"#
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.into()
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),
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142
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11
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);
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assert_eq!(
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Day1::part2(
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r#"two1nine
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eightwothree
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abcone2threexyz
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xtwone3four
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4nineeightseven2
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zoneight234
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7pqrstsixteen"#
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r#"3 4
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4 3
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2 5
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1 3
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3 9
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3 3"#
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.into()
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),
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281
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31
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);
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}
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}
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@ -6,8 +6,10 @@ use std::{env, io};
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#[derive(Debug)]
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enum InputFileError {
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#![allow(dead_code)]
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#[allow(dead_code)]
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EnvVar(env::VarError),
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#[allow(dead_code)]
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Io(io::Error),
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}
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