Day1
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@ -6,3 +6,5 @@ edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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env_logger = "0.10.1"
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log = "0.4.20"
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,116 @@
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use log::debug;
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fn first_and_last(line: &str) -> i32 {
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let first = line.chars().find_map(|c| c.to_digit(10)).unwrap();
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let last = line.chars().rev().find_map(|c| c.to_digit(10)).unwrap();
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let number: String = format!("{}{}", first, last);
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debug!("Number: {}", number);
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number.parse::<i32>().unwrap()
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}
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fn search_and_replace(line: &str) -> String {
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let number_mapping = [
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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 replacements: Vec<(usize, usize, &str, &str)> = Vec::new();
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for (search, replace) in number_mapping {
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let mut start = 0;
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let mut last_pos = None;
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while let Some(pos) = line[start..].find(search) {
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let abs_pos = start + pos;
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last_pos = Some(abs_pos + search.len());
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start = abs_pos + search.len();
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}
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if let Some(last) = last_pos {
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replacements.push((last - search.len(), last, search, replace));
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}
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}
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// Sort by position in ascending order, excluding the last occurrences
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replacements.sort_by(|a, b| a.0.cmp(&b.0));
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let mut modified_line = line.to_string();
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for (_, _, search, replace) in replacements {
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modified_line = modified_line.replace(search, replace);
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}
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modified_line
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}
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pub fn day1(input: String) {
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let result1: i32 = input
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.lines()
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.map(|line| -> i32 { first_and_last(line) })
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.sum();
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let result2: i32 = input
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.lines()
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.map(|line: &str| -> i32 {
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let modified_line = search_and_replace(line);
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first_and_last(&modified_line)
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})
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.sum();
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println!("Result day 1: [{}] [{}]", result1, result2);
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}
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#[cfg(test)]
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mod test_day1 {
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use crate::day1::{first_and_last, search_and_replace};
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#[test]
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fn test() {
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let input = "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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||||
let mut lines: std::str::Lines<'_> = input.lines();
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assert_eq!(
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29,
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first_and_last(&search_and_replace(lines.next().unwrap()))
|
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);
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assert_eq!(
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83,
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first_and_last(&search_and_replace(lines.next().unwrap()))
|
||||
);
|
||||
assert_eq!(
|
||||
13,
|
||||
first_and_last(&search_and_replace(lines.next().unwrap()))
|
||||
);
|
||||
assert_eq!(
|
||||
24,
|
||||
first_and_last(&search_and_replace(lines.next().unwrap()))
|
||||
);
|
||||
assert_eq!(
|
||||
42,
|
||||
first_and_last(&search_and_replace(lines.next().unwrap()))
|
||||
);
|
||||
assert_eq!(
|
||||
14,
|
||||
first_and_last(&search_and_replace(lines.next().unwrap()))
|
||||
);
|
||||
assert_eq!(
|
||||
76,
|
||||
first_and_last(&search_and_replace(lines.next().unwrap()))
|
||||
);
|
||||
}
|
||||
}
|
||||
22
src/main.rs
22
src/main.rs
|
|
@ -1,3 +1,23 @@
|
|||
use std::{env, fs::read_to_string};
|
||||
|
||||
use day1::day1;
|
||||
use log::LevelFilter;
|
||||
|
||||
pub mod day1;
|
||||
|
||||
fn main() {
|
||||
println!("Hello, world!");
|
||||
env_logger::Builder::from_default_env()
|
||||
.filter_level(LevelFilter::Debug)
|
||||
.init();
|
||||
|
||||
let args: Vec<String> = env::args().collect();
|
||||
|
||||
let mut day: &String = &"all".to_string();
|
||||
if args.len() > 1 {
|
||||
day = &args[1];
|
||||
}
|
||||
|
||||
if day == &"day1".to_string() || day == &"all".to_string() {
|
||||
day1(read_to_string("assets/day1.txt").unwrap().to_owned());
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue