67 lines
1.7 KiB
Rust
67 lines
1.7 KiB
Rust
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use crate::common::AdventOfCodeDay;
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use std::u32;
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#[derive(Debug)]
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struct BoardingPass {
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row: u32,
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column: u32,
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}
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#[derive(Debug)]
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pub struct Day05 {
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input: Vec<BoardingPass>,
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}
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impl BoardingPass {
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fn seat_id(&self) -> u32 { self.row * 8 + self.column }
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}
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fn parse_line(val: &str) -> BoardingPass {
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let sval = val.to_owned()
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.replace("F", "0")
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.replace("B", "1")
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.replace("R", "1")
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.replace("L", "0");
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BoardingPass {
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row: u32::from_str_radix(&sval[0..7], 2).unwrap(),
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column: u32::from_str_radix(&sval[7..10], 2).unwrap(),
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}
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}
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impl Day05 {
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pub fn new() -> Self {
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let input_bytes = include_bytes!("../res/05_input.txt");
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let input_str = String::from_utf8_lossy(input_bytes);
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let data = input_str
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.lines()
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.map(parse_line)
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.collect::<Vec<BoardingPass>>();
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Self {
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input: data
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}
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}
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}
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impl AdventOfCodeDay for Day05 {
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fn task_1(&self) -> String {
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verboseln!("{:?}", self.input);
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return self.input.iter().map(|p| p.seat_id()).max().unwrap().to_string()
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}
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fn task_2(&self) -> String {
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let min = self.input.iter().map(|p| p.seat_id() as u64).min().unwrap();
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let sum = self.input.iter().map(|p| p.seat_id() as u64 - min).sum::<u64>(); // sum of all pass numbers
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let allsum = (self.input.len() * (self.input.len() + 1) / 2) as u64; // sum if all pass numbers are there
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let missing = (allsum - sum) + min; // diff = the _one_ missing number
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return missing.to_string()
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}
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}
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