Day 8
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3 changed files with 233 additions and 1 deletions
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res/08/input.txt
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res/08/input.txt
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114
src/days/d08.rs
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src/days/d08.rs
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use std::fs;
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pub fn solve() {
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let path = "res/08/input.txt";
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let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
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let cont_arr = contents.lines().collect::<Vec<&str>>();
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// parse trees as 2D i32 Vec
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let trees: Vec<Vec<i32>> = cont_arr.iter()
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.filter(|line| **line != "")
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.map(|line|
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line.chars().collect::<Vec<char>>()
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.iter().map(|t| return t.to_digit(10).unwrap() as i32)
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.collect()
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).collect();
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let width = trees[0].len();
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let height = trees.len();
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// task 1
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// initialize visibilities with 0
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let mut visibilities: Vec<Vec<i32>> = (0..height).map(|_| {
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(0..width).map(|_| 0).collect()
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}).collect();
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// mark visible trees with 1
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// left to right & right to left
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for i in 0..height {
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let mut last_max_left = -1;
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let mut last_max_right = -1;
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for j in 0..width {
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if trees[i][j] > last_max_left {
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visibilities[i][j] = 1;
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last_max_left = trees[i][j];
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}
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if trees[i][width-j-1] > last_max_right {
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visibilities[i][width-j-1] = 1;
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last_max_right = trees[i][width-j-1];
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}
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}
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}
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// top to bot & bot to top
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for i in 0..width {
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let mut last_max_top = -1;
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let mut last_max_bot = -1;
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for j in 0..height {
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if trees[j][i] > last_max_top {
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visibilities[j][i] = 1;
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last_max_top = trees[j][i];
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}
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if trees[width-j-1][i] > last_max_bot {
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visibilities[height-j-1][i] = 1;
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last_max_bot = trees[height-j-1][i];
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}
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}
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}
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// sum all visible trees
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let res = visibilities.iter()
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.map(|line| line.iter().sum::<i32>())
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.sum::<i32>();
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println!("Result 1: {}", res);
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// task 2
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let scenic_scores: Vec<Vec<i32>> = (0..height).map(|i| {
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(0..width).map(|j| {
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// calculate view range in each direction
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let mut to_top = 0;
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for k in (0..i).rev() {
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to_top += 1;
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if trees[k][j] >= trees[i][j] { break; }
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}
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let mut to_bot = 0;
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for k in i+1..height {
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to_bot += 1;
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if trees[k][j] >= trees[i][j] { break; }
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}
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let mut to_left = 0;
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for k in (0..j).rev() {
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to_left += 1;
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if trees[i][k] >= trees[i][j] { break; }
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}
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let mut to_right = 0;
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for k in j+1..width {
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to_right += 1;
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if trees[i][k] >= trees[i][j] { break; }
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}
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to_top*to_bot*to_left*to_right
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}).collect()
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}).collect();
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// find max scenic score
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let res = scenic_scores.iter()
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.map(|line| line.iter().max().unwrap())
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.max().unwrap();
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println!("Result 2: {}", res)
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}
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src/main.rs
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src/main.rs
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pub mod days;
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fn main() {
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days::d07::solve();
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_all_days()
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}
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fn _all_days() {
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println!("Day 1");
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days::d01::solve();
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println!("\nDay 2");
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days::d02::solve();
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println!("\nDay 3");
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days::d03::solve();
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println!("\nDay 4");
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days::d04::solve();
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println!("\nDay 5");
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days::d05::solve();
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println!("\nDay 6");
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days::d06::solve();
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println!("\nDay 7");
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days::d07::solve();
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println!("\nDay 8");
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days::d08::solve();
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}
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