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use std::collections::HashSet; | ||
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use advent_of_code::get_str_array_from_file; | ||
use itertools::Itertools; | ||
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type Grid = Vec<Vec<usize>>; | ||
type VisibleSet = HashSet<(usize, usize)>; | ||
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fn find_visible_line<'a, T>(list: T) -> Vec<usize> | ||
where T: Iterator<Item=&'a usize> { | ||
let mut tallest = None; | ||
list.enumerate().fold(vec!{}, |mut visibles, (i, v)| { | ||
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if tallest.is_some() { | ||
if v > tallest.unwrap() { | ||
tallest = Some(v); | ||
visibles.push(i); | ||
} | ||
} else { | ||
tallest = Some(v); | ||
visibles.push(i); | ||
} | ||
visibles | ||
}) | ||
} | ||
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#[test] | ||
fn test_find_visible_line() { | ||
let iter = vec!{1,3,2,4}; | ||
assert_eq!(find_visible_line(iter.iter()), vec!{0,1,3}); | ||
assert_eq!(find_visible_line(iter.iter().rev()), vec!{0}); | ||
} | ||
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fn find_visible_in_grid(grid: &Grid) -> VisibleSet { | ||
let mut set = HashSet::new(); | ||
let row_count = grid.len(); | ||
let column_count = grid[0].len(); | ||
for y in 0..row_count { | ||
let row = &grid[y]; | ||
let left_tallest = find_visible_line(row.iter()); | ||
let right_tallest = find_visible_line(row.iter().rev()).iter().map(|v| column_count - 1 - v).collect(); | ||
for x in [left_tallest, right_tallest].concat() { | ||
set.insert((x, y)); | ||
} | ||
} | ||
for x in 0..column_count { | ||
let column: Vec<usize> = grid.iter().map(|row| row[x]).collect(); | ||
let top_tallest = find_visible_line(column.iter()); | ||
let bottom_tallest = find_visible_line(column.iter().rev()).iter().map(|v| row_count - 1 - v).collect(); | ||
for y in [top_tallest, bottom_tallest].concat() { | ||
set.insert((x, y)); | ||
} | ||
} | ||
set | ||
} | ||
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#[test] | ||
fn test_find_visible_in_grid() { | ||
let grid = vec!{ | ||
vec![3,0,3,7,3], | ||
vec![2,5,5,1,2], | ||
vec![6,5,3,3,2], | ||
vec![3,3,5,4,9], | ||
vec![3,5,3,9,0], | ||
}; | ||
assert_eq!(find_visible_in_grid(&grid).len(), 21); | ||
} | ||
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fn main() { | ||
let data = get_str_array_from_file(&vec!{"aoc2022", "data", "8.txt"}); | ||
let grid = data.iter().map(|row| { | ||
row.chars().map(|v| v.to_string().parse::<usize>().unwrap()).collect() | ||
}).collect(); | ||
let visibles = find_visible_in_grid(&grid); | ||
println!("Part 1: {}", visibles.len()); | ||
} |
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