Add helper
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@ -1,6 +1,7 @@
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#![feature(test)]
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extern crate test;
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use std::collections::HashMap;
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use aoc2020::common::*;
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type Parsed = Vec<usize>;
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@ -8,8 +9,9 @@ fn read_input() -> String {
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String::from("15,12,0,14,3,1")
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}
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#[inline]
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fn parse_input(raw: &str) -> Parsed {
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raw.split(',').filter_map(|x| x.parse().ok()).collect()
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parse_nums(raw)
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}
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#[rustfmt::skip]
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@ -45,23 +45,13 @@ fn parse_input(raw: &str) -> Parsed {
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let (rules, my_ticket, nearby) = raw.split("\n\n").next_tuple().unwrap();
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Parsed {
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rules: rules.lines().map_into().collect(),
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my_ticket: my_ticket
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.split_once('\n')
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.unwrap()
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.1
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.split(',')
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.map(|n| n.parse().unwrap())
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.collect(),
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nearby_tickets: nearby
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.lines()
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.skip(1)
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.map(|l| l.split(',').map(|n| n.parse().unwrap()).collect())
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.collect(),
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my_ticket: parse_nums(my_ticket.split_once('\n').unwrap().1),
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nearby_tickets: nearby.lines().skip(1).map(parse_nums).collect(),
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}
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}
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// Could be optimized by folding the ranges first to only have one lower and one upper (or even
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// just a single one if they’re continuous), but meh.
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// Could be optimized by merging overlapping ranges into one before checking all the tickets.
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// … or so I thought until I tried, benchmarked, and saw that that takes twice as long.
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fn part1(parsed: &Parsed) -> usize {
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parsed
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.nearby_tickets
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@ -9,3 +9,8 @@ pub fn read_file(day: usize) -> String {
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)
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.unwrap()
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}
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#[inline]
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pub fn parse_nums(l: &str) -> Vec<usize> {
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l.split(',').filter_map(|n| n.parse().ok()).collect()
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}
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