From 1b08937fecfb8681298885a799389ac3f0d2e325 Mon Sep 17 00:00:00 2001 From: mat ess Date: Sun, 4 Dec 2022 00:32:14 -0500 Subject: [PATCH] Day 4 --- inputs/4.small.txt | 6 + inputs/4.txt | 1000 ++++++++++++++++++++++++++++++++++++++++++++ src/main.rs | 59 ++- 3 files changed, 1063 insertions(+), 2 deletions(-) create mode 100644 inputs/4.small.txt create mode 100644 inputs/4.txt diff --git a/inputs/4.small.txt b/inputs/4.small.txt new file mode 100644 index 0000000..9f9e9cf --- /dev/null +++ b/inputs/4.small.txt @@ -0,0 +1,6 @@ +2-4,6-8 +2-3,4-5 +5-7,7-9 +2-8,3-7 +6-6,4-6 +2-6,4-8 diff --git a/inputs/4.txt b/inputs/4.txt new file mode 100644 index 0000000..b52da37 --- /dev/null +++ b/inputs/4.txt @@ -0,0 +1,1000 @@ +75-76,18-75 +2-54,1-50 +82-83,78-82 +13-37,37-75 +79-80,2-80 +29-90,30-89 +13-16,12-15 +20-93,20-94 +90-95,33-90 +16-77,76-92 +42-52,15-52 +6-34,9-89 +13-77,12-76 +18-81,17-81 +2-34,2-33 +17-92,20-93 +24-89,7-11 +6-49,27-49 +17-69,16-69 +34-57,35-58 +71-76,73-87 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DAYS] = [ [ // day 1 part 1 @@ -114,8 +115,62 @@ const SOLNS: [Day; DAYS] = [ .sum() }, ], + [ + // day 4 part 1 + |input| { + make_ranges(input) + .iter() + .map(|(first, second)| { + range_contains(first, second) || range_contains(second, first) + }) + .map(|b| if b { 1 } else { 0 }) + .sum() + }, + // day 4 part 2 + |input| { + make_ranges(input) + .iter() + .map(|(first, second)| { + range_overlaps(first, second) || range_overlaps(second, first) + }) + .map(|b| if b { 1 } else { 0 }) + .sum() + }, + ], ]; +fn make_ranges(input: String) -> Vec<(Range, Range)> { + input + .lines() + .map(|line| { + line.split(',') + .map(|range| { + range + .split('-') + .map(|num| num.parse::().expect("bad num :/")) + }) + .map(|mut nums| { + let lo = nums.next().expect("nolo :/"); + let hi = nums.next().expect("nohi :/"); + lo..=hi + }) + }) + .map(|mut ranges| { + let f = ranges.next().unwrap(); + let s = ranges.next().unwrap(); + (f, s) + }) + .collect() +} + +fn range_contains(r1: &Range, r2: &Range) -> bool { + r1.start() <= r2.start() && r1.end() >= r2.end() +} + +fn range_overlaps(r1: &Range, r2: &Range) -> bool { + r1.contains(r2.start()) +} + #[derive(Copy, Clone, PartialEq, Eq)] enum RPS { Rock,