day08 Add part 1

Took multiple seconds to run, so I wonder if there's a more efficient
way to do this. Maybe would be better to have a Vec<Vec<usize>> instead
of putting all lines after each other.
This commit is contained in:
MasterofJOKers 2022-12-20 23:15:33 +01:00
parent bc3599fff0
commit 30c0c2b42f
3 changed files with 78 additions and 0 deletions

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day08/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "day08"
version = "0.1.0"

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day08/Cargo.toml Normal file
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[package]
name = "day08"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

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day08/src/main.rs Normal file
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use std::error;
use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;
fn main() -> Result<(), Box<dyn error::Error>> {
let f = File::open("input.txt")?;
let reader = BufReader::new(f);
let mut map = vec![];
let mut width = 0;
for line in reader.lines() {
let line = line?;
width = line.len();
map.extend(line.chars().map(|c| c.to_digit(10)).flatten().map(|d| d as usize));
}
let width = width;
let height = map.len() / width;
let mut visible_count = 0;
for i in 0..map.len() {
let line = i / height;
let column = i % width + 1; // we need + 1 here, because there is no modulo 0
// println!("line: {}, column: {}, self: {}", line, column, map[i]);
let left = map[(line * width)..i].iter().max();
let right = map[i..((line + 1) * width)].iter()
.enumerate()
.filter_map(|(j, x)| if (j + i) / height == line && j > 0 { Some(x) } else { None })
.max();
// let right = map[(i + 1)..((line + 1) * width)].iter().max();
let up = map[0..i].iter()
.enumerate()
//.inspect(|(j, x)| println!("{j} {x}"))
.filter_map(|(j, x)| if (j + 1) % width == column { Some(x) } else { None })
.max();
let down = map[i..].iter()
.enumerate()
.filter_map(|(j, x)| if (i + j + 1) % width == column && j > 0 { Some(x) } else { None })
.max();
// println!("left: {:?}, right: {:?}, up: {:?}, down: {:?}", &left, &right, &up, &down);
for direction_max in vec![left, right, up, down] {
match direction_max {
Some(x) if x < &map[i] => {
visible_count += 1;
break;
},
None => {
visible_count += 1;
break;
},
_ => ()
}
}
// println!("visible: {visible_count}");
}
println!("Found {visible_count} visible trees.");
Ok(())
}