From 74819475caa236b5991a645d6ea291309aee2e3b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tristan=20Dani=C3=ABl=20Maat?= Date: Fri, 11 Dec 2020 23:29:34 +0000 Subject: [PATCH] Complete day 11.1 --- day-11/Cargo.lock | 78 ++++++++++++++++++++ day-11/Cargo.toml | 10 +++ day-11/input | 93 +++++++++++++++++++++++ day-11/src/main.rs | 180 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 361 insertions(+) create mode 100644 day-11/Cargo.lock create mode 100644 day-11/Cargo.toml create mode 100644 day-11/input create mode 100644 day-11/src/main.rs diff --git a/day-11/Cargo.lock b/day-11/Cargo.lock new file mode 100644 index 0000000..5e329eb --- /dev/null +++ b/day-11/Cargo.lock @@ -0,0 +1,78 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "day-11" +version = "0.1.0" +dependencies = [ + "indoc", +] + +[[package]] +name = "indoc" +version = "0.3.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8" +dependencies = [ + "indoc-impl", + "proc-macro-hack", +] + +[[package]] +name = "indoc-impl" +version = "0.3.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0" +dependencies = [ + "proc-macro-hack", + "proc-macro2", + "quote", + "syn", + "unindent", +] + +[[package]] +name = "proc-macro-hack" +version = "0.5.19" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5" + +[[package]] +name = "proc-macro2" +version = "1.0.24" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71" +dependencies = [ + "unicode-xid", +] + +[[package]] +name = "quote" +version = "1.0.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37" +dependencies = [ + "proc-macro2", +] + +[[package]] +name = "syn" +version = "1.0.54" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44" +dependencies = [ + "proc-macro2", + "quote", + "unicode-xid", +] + +[[package]] +name = "unicode-xid" +version = "0.2.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564" + +[[package]] +name = "unindent" +version = "0.1.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7" diff --git a/day-11/Cargo.toml b/day-11/Cargo.toml new file mode 100644 index 0000000..5cf3b01 --- /dev/null +++ b/day-11/Cargo.toml @@ -0,0 +1,10 @@ +[package] +name = "day-11" +version = "0.1.0" +authors = ["Tristan Daniël Maat "] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +indoc = "0.3" diff --git a/day-11/input b/day-11/input new file mode 100644 index 0000000..7cf41d9 --- /dev/null +++ b/day-11/input @@ -0,0 +1,93 @@ +LLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL +LLLLLLLLLL.LLLL.LLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLL.LLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLL +LLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL +LLLLLLLLLLLLLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL +LLLLLLLLLL.LLLLLL.LL.LLLLLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLL.LLLLLLLL +LLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLLL.L.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLL.LLLLLLLL +LLLLLLLLLL.LLLL.LLLL.LLLLLLLL.LLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLL.LLLLLLLL 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+#[derive(Copy, Clone, Debug, PartialEq)] +enum Seating { + Occupied, + Empty, + Floor, +} + +impl Seating { + fn new(symbol: char) -> Result { + match symbol { + '#' => Ok(Seating::Occupied), + 'L' => Ok(Seating::Empty), + '.' => Ok(Seating::Floor), + rubbish => Err(format!("Found some rubbish on the floor, area must be clean to conserve human behavior: {}", rubbish)) + } + } +} + +fn parse_layout(input: &str) -> Result>, String> { + input + .lines() + .map(|line| line.chars().map(Seating::new).collect()) + .collect() +} + +fn print_layout(layout: &Vec>) { + let output: String = layout + .iter() + .map(|row| { + let mut row: String = row + .iter() + .map(|c| match c { + Seating::Occupied => '#', + Seating::Empty => 'L', + Seating::Floor => '.', + }) + .collect(); + row.push('\n'); + row + }) + .collect(); + + println!("{}", output); +} + +fn get_adjacent(layout: &Vec>, i: usize, j: usize) -> Vec> { + let adjacent: [[usize; 2]; 8] = [ + [0, 0], + [0, 1], + [0, 2], + [1, 0], + [1, 2], + [2, 0], + [2, 1], + [2, 2], + ]; + + adjacent + .iter() + .map(|[nudge_row, nudge_col]| { + if let Some(row) = (i + nudge_row).checked_sub(1) { + if let Some(row) = layout.get(row) { + if let Some(col) = (j + nudge_col).checked_sub(1) { + row.get(col) + } else { + None + } + } else { + None + } + } else { + None + } + }) + .collect() +} + +fn simulate_people(layout: &Vec>) -> (Vec>, usize) { + let mut changes = 0; + + let layout = layout + .iter() + .enumerate() + .map(|(i, row)| { + row.iter() + .enumerate() + .map(|(j, seat)| match seat { + Seating::Occupied => { + if get_adjacent(layout, i, j) + .iter() + .filter(|seat| **seat == Some(&Seating::Occupied)) + .count() + >= 4 + { + changes += 1; + Seating::Empty + } else { + Seating::Occupied + } + } + Seating::Empty => { + if get_adjacent(layout, i, j) + .iter() + .any(|seat| *seat == Some(&Seating::Occupied)) + { + Seating::Empty + } else { + changes += 1; + Seating::Occupied + } + } + Seating::Floor => Seating::Floor, + }) + .collect() + }) + .collect(); + + (layout, changes) +} + +fn count_eventually_occupied_seats(layout: &Vec>) -> usize { + let mut loop_layout = layout.clone(); + + loop { + let (res, changes) = simulate_people(&loop_layout); + loop_layout = res; + + if changes == 0 { + break; + } + } + + loop_layout + .iter() + .flatten() + .filter(|seat| **seat == Seating::Occupied) + .count() +} + +#[cfg(test)] +mod tests { + use super::*; + use indoc::indoc; + + #[test] + fn test_simple() -> Result<(), Box> { + let input = indoc!( + "L.LL.LL.LL + LLLLLLL.LL + L.L.L..L.. + LLLL.LL.LL + L.LL.LL.LL + L.LLLLL.LL + ..L.L..... + LLLLLLLLLL + L.LLLLLL.L + L.LLLLL.LL + " + ); + + let layout = parse_layout(&input)?; + let result = count_eventually_occupied_seats(&layout); + + assert_eq!(result, 37); + Ok(()) + } +}