Added day 13
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1000655
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17,x,x,x,x,x,x,x,x,x,x,37,x,x,x,x,x,571,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,13,x,x,x,x,23,x,x,x,x,x,29,x,401,x,x,x,x,x,x,x,x,x,41,x,x,x,x,x,x,x,x,19
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@ -1,5 +1,2 @@
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F10
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N3
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F7
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R90
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F11
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939
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7,13,x,x,59,x,31,19
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use itertools::Itertools;
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use std::error::Error;
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use std::fs::File;
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use std::io::{self, BufRead};
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use std::vec::Vec;
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fn main() -> Result<(), Box<dyn Error>> {
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let file = File::open("inputs/day13.txt")?;
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let mut lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
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let depature_time: u32 = lines.nth(0).unwrap().parse().unwrap();
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let buses: Vec<u32> = lines
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.nth(0)
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.unwrap()
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.split(',')
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.filter_map(|b| b.parse().ok())
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.collect();
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let times: Vec<(u32, u32)> = buses
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.iter()
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.map(|b| (*b, b - (depature_time % b)))
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.collect();
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let best_time = times
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.iter()
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.fold(times[0], |a, b| if a.1 < b.1 { a } else { *b });
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println!("Line: {}, Wait Time: {}", best_time.0, best_time.1);
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println!("Answer: {}", best_time.0 * best_time.1);
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Ok(())
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}
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use itertools::Itertools;
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use std::error::Error;
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use std::fs::File;
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use std::io::{self, BufRead};
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use std::vec::Vec;
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fn next_depature(t: u64, b: u64) -> u64 {
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if t % b == 0 {
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0
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} else {
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b - (t % b)
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}
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}
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fn print_rests(t: u64, buses: &Vec<Option<u64>>) {
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for i in 0..buses.len() {
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if let Some(bus) = buses[i] {
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println!("{} : {} {}", bus, i, t % bus);
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}
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}
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}
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fn main() -> Result<(), Box<dyn Error>> {
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let file = File::open("inputs/day13.txt")?;
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let mut lines = io::BufReader::new(file).lines().map(|l| l.unwrap());
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let buses: Vec<Option<u64>> = lines
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.nth(1)
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.unwrap()
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.split(',')
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.map(|b| b.parse().ok())
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.collect();
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let mut step = buses[0].unwrap();
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let mut t: u64 = 0;
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for i in 1..buses.len() {
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if let Some(bus) = buses[i] {
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loop {
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t = t + step;
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if (t + i as u64) % bus == 0 {
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step = step * bus;
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break;
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}
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}
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}
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}
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println!("{}", t);
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Ok(())
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}
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