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pub fn run() -> (String, String) { | ||
const DATA: &str = include_str!("input.txt"); | ||
(part1(DATA).to_string(), part2(DATA).to_string()) | ||
} | ||
|
||
fn parse_input(lines: &Vec<&str>) -> Vec<Vec<i32>> { | ||
let mut trees: Vec<Vec<i32>> = Vec::new(); | ||
|
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for line in lines { | ||
trees.push( | ||
line.chars() | ||
.map(|c| c.to_digit(10).unwrap() as i32) | ||
.collect(), | ||
); | ||
} | ||
trees | ||
} | ||
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fn is_visible(trees: &Vec<Vec<i32>>, x: usize, y: usize) -> bool { | ||
// Check if we are on the edge | ||
if x == 0 || y == 0 || x == trees[0].len() - 1 || y == trees.len() - 1 { | ||
return true; | ||
} | ||
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let mut visible_up = true; | ||
let mut visible_down = true; | ||
let mut visible_left = true; | ||
let mut visible_right = true; | ||
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// Look up for taller trees | ||
for i in 0..y { | ||
if trees[i][x] >= trees[y][x] { | ||
visible_up = false; | ||
break; | ||
} | ||
} | ||
|
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// Look down for taller trees | ||
for i in y + 1..trees.len() { | ||
if trees[i][x] >= trees[y][x] { | ||
visible_down = false; | ||
break; | ||
} | ||
} | ||
|
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// Look left for taller trees | ||
for i in 0..x { | ||
if trees[y][i] >= trees[y][x] { | ||
visible_left = false; | ||
break; | ||
} | ||
} | ||
|
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// Look right for taller trees | ||
for i in x + 1..trees[0].len() { | ||
if trees[y][i] >= trees[y][x] { | ||
visible_right = false; | ||
break; | ||
} | ||
} | ||
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visible_up || visible_down || visible_left || visible_right | ||
} | ||
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fn part1(data: &str) -> i32 { | ||
let lines: Vec<&str> = data.lines().collect(); | ||
let trees = parse_input(&lines); | ||
let mut visible_trees: i32 = 0; | ||
|
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for y in 0..trees.len() { | ||
for x in 0..trees[0].len() { | ||
if is_visible(&trees, x, y) { | ||
visible_trees += 1; | ||
} | ||
} | ||
} | ||
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visible_trees | ||
} | ||
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fn part2(data: &str) -> i32 { | ||
0 | ||
} | ||
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#[cfg(test)] | ||
mod test { | ||
use super::*; | ||
const INPUT: &str = include_str!("input.test.txt"); | ||
|
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#[test] | ||
fn p1() { | ||
assert_eq!(part1(INPUT), 21); | ||
} | ||
|
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#[test] | ||
fn p2() { | ||
assert_eq!(part2(INPUT), 0); | ||
} | ||
} |
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