82 lines
2.0 KiB
Rust
82 lines
2.0 KiB
Rust
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use std::collections::HashSet;
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use aoc_runner_derive::{aoc as aoc_run, aoc_generator};
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use ndarray::prelude::*;
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type Forest = Array2<i8>;
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type Tree = (i8, i8);
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#[aoc_generator(day8)]
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fn parse_input_day1(input: &str) -> Forest {
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let nrows = input.lines().map(|_| ()).collect::<Vec<_>>().len();
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let ncols = input.lines().next().unwrap().len();
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let shape = (nrows, ncols);
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let mut arr = Array2::zeros(shape);
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for (row, line) in input.lines().enumerate() {
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for (col, tree) in line.chars().enumerate() {
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arr[[row, col]] = tree.to_digit(10).unwrap() as i8;
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}
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}
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arr
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}
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#[aoc_run(day8, part1)]
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fn part1(input: &Forest) -> usize {
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let mut viz = HashSet::new();
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for (ridx, row) in input.rows().into_iter().enumerate() {
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let mut max = -1;
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for (cidx, &tree) in row.as_slice().unwrap().iter().enumerate() {
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if tree > max {
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let addr = (ridx, cidx);
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viz.insert(addr);
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max = tree;
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}
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}
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max = -1;
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for (cidx, &tree) in row.as_slice().unwrap().iter().enumerate().rev() {
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if tree > max {
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viz.insert((ridx, cidx));
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max = tree;
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}
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}
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}
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for (cidx, col) in input.columns().into_iter().enumerate() {
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let mut max = -1;
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for (ridx, &tree) in col
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.as_standard_layout()
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.as_slice()
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.unwrap()
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.iter()
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.enumerate()
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{
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if tree > max {
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viz.insert((ridx, cidx));
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max = tree;
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}
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}
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max = -1;
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for (ridx, &tree) in col
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.as_standard_layout()
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.as_slice()
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.unwrap()
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.iter()
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.enumerate()
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.rev()
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{
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if tree > max {
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viz.insert((ridx, cidx));
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max = tree;
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}
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}
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}
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viz.len()
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}
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#[aoc_run(day8, part2)]
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fn part2(input: &Forest) -> usize {
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0
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}
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