From 02a1b2b68b83e41d4b17939069f8b39fa0a852b3 Mon Sep 17 00:00:00 2001 From: Christian Ulrich Date: Thu, 8 Dec 2022 16:21:18 +0100 Subject: [PATCH] add day 8, part 1 --- day08/common.rs | 55 ++++++++++++++++++++++++++ day08/input | 100 ++++++++++++++++++++++++++++++++++++++++++++++++ day08/part1.rs | 40 +++++++++++++++++++ day08/testinput | 5 +++ 4 files changed, 200 insertions(+) create mode 100644 day08/common.rs create mode 100644 day08/input create mode 100644 day08/part1.rs create mode 100644 day08/testinput diff --git a/day08/common.rs b/day08/common.rs new file mode 100644 index 0000000..6fe6037 --- /dev/null +++ b/day08/common.rs @@ -0,0 +1,55 @@ +// Copyright 2022 Christian Ulrich +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see . + +use std::io; + +pub struct Forest { + trees: Vec>, +} + +impl Forest { + pub fn from_stdin() -> Result { + let mut trees = vec![]; + for line in io::stdin().lines() { + let line = line.unwrap(); + if line.len() > 0 { + trees.push(line.bytes().map(|b| b - '0' as u8).collect()); + } + } + Ok(Self { trees: trees }) + } + + pub fn dimensions(&self) -> (usize, usize) { + (self.trees[0].len(), self.trees.len()) + } + + pub fn tree(&self, x: usize, y: usize) -> Option { + match y < self.trees.len() && x < self.trees[0].len() { + false => None, + true => Some(self.trees[y][x]), + } + } + + pub fn line(&self, index: usize) -> Option> { + Some(self.trees.get(index)?.iter()) + } + + pub fn column(&self, index: usize) -> Option> { + match self.trees[0].len() > index { + false => None, + true => Some(self.trees.iter().map(move |line| &line[index])), + } + } +} diff --git a/day08/input b/day08/input new file mode 100644 index 0000000..d4d4fd0 --- /dev/null +++ b/day08/input @@ -0,0 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--- /dev/null +++ b/day08/part1.rs @@ -0,0 +1,40 @@ +// Copyright 2022 Christian Ulrich +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see . +// +// usage: ./part1 < input + +pub mod common; + +use common::Forest; + +fn main() -> Result<(), &'static str> { + let forest = Forest::from_stdin()?; + let (x_len, y_len) = forest.dimensions(); + let mut result = 0; + for y in 0..y_len { + for x in 0..x_len { + let tree = forest.tree(x, y).unwrap(); + let is_visible = forest.line(y).unwrap().take(x).all(|t| t < &tree) + || forest.line(y).unwrap().skip(x + 1).all(|t| t < &tree) + || forest.column(x).unwrap().take(y).all(|t| t < &tree) + || forest.column(x).unwrap().skip(y + 1).all(|t| t < &tree); + if is_visible { + result += 1; + } + } + } + println!("{result}"); + Ok(()) +} diff --git a/day08/testinput b/day08/testinput new file mode 100644 index 0000000..16d6fbd --- /dev/null +++ b/day08/testinput @@ -0,0 +1,5 @@ +30373 +25512 +65332 +33549 +35390