2020-12-06 20:11:09 +01:00
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use std::fs;
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2020-12-02 06:15:53 +01:00
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use std::fs::File;
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2020-12-06 20:11:09 +01:00
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use std::io::{prelude::*, BufReader};
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use std::error::Error;
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use regex::Regex;
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2020-12-02 06:15:53 +01:00
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2020-12-06 20:11:09 +01:00
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pub fn aoc_01_both(filename: &str) -> Result<(), Box<dyn Error>> {
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2020-12-02 06:15:53 +01:00
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let file = File::open(filename).expect("No file");
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let br = BufReader::new(file);
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let mut v: Vec<i64> = vec![];
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for line in br.lines() {
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v.push(line?
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.trim()
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.parse().unwrap());
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}
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for i in 0..v.len()-2 {
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for j in i+1..v.len()-1 {
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if v[i] + v[j] == 2020 {
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println!("aoc_01_01 result: {}", v[i]*v[j]);
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}
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}
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}
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for i in 0..v.len()-3 {
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for j in i+1..v.len()-2 {
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for k in j+1..v.len()-1 {
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if v[i] + v[j] + v[k] == 2020 {
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println!("aoc_01_02 result: {}", v[i] * v[j] * v[k]);
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}
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}
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}
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}
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return Ok(());
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2020-12-06 20:11:09 +01:00
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}
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pub fn aoc_02(filename: &str) -> Result<(), Box<dyn Error>> {
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let contents = fs::read_to_string(filename)?;
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let pairs: Vec<Vec<String>> = contents.lines().map(|line| {
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line.split(":").map(|s| String::from(s)).collect()
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}).collect();
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aoc_02_01(&pairs).unwrap();
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aoc_02_02(&pairs).unwrap();
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Ok(())
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}
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fn aoc_02_01(pairs: &Vec<Vec<String>>) -> Result<(), Box<dyn Error>> {
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let mut valid = 0;
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let rules_re = Regex::new(r"(\d*)-(\d*) ([a-z])").unwrap();
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for i in 0..pairs.len() {
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let rule = rules_re.captures(&pairs[i][0]).unwrap();
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let min = rule[1].parse::<usize>().unwrap();
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let max = rule[2].parse::<usize>().unwrap();
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let matches: usize = pairs[i][1].matches(&rule[3]).count();
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if matches >= min && matches <= max {
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valid += 1;
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}
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}
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println!("2_1 had {}/{} valid passwords", valid, pairs.len());
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return Ok(());
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}
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fn aoc_02_02(pairs: &Vec<Vec<String>>) -> Result<(), Box<dyn Error>> {
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let mut valid = 0;
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let rules_re = Regex::new(r"(\d*)-(\d*) ([a-z])").unwrap();
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for i in 0..pairs.len() {
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let rule = rules_re.captures(&pairs[i][0]).unwrap();
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let first = rule[1].parse::<usize>().unwrap();
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let sec = rule[2].parse::<usize>().unwrap();
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2020-12-06 20:13:52 +01:00
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// the indexes are 1 based but the pairs[x][2] has a leading space so it works out... -_-;
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2020-12-06 20:11:09 +01:00
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let m1 = pairs[i][1].as_bytes()[first] == rule[3].as_bytes()[0];
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let m2 = pairs[i][1].as_bytes()[sec] == rule[3].as_bytes()[0];
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if (m1 || m2) && !(m1 && m2) {
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valid += 1;
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}
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}
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2020-12-02 06:15:53 +01:00
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2020-12-06 20:11:09 +01:00
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println!("2_2 had {}/{} valid passwords", valid, pairs.len());
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return Ok(());
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2020-12-02 06:15:53 +01:00
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}
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