ishan/aoc2020
1
0
Fork 0
Code Releases Activity

Added Day 4 Part 1

Browse Source
This commit is contained in:
Ishan Jain 2020-12-04 11:08:59 +05:30
parent be2a7fcef3
commit 7ca65d40dd
No known key found for this signature in database
GPG Key ID: F261A0E73038D89D
3 changed files with 1179 additions and 377 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1458
input
View File

File diff suppressed because it is too large Load Diff

24
small.input
View File

@ -1,11 +1,13 @@
..##....... ecl:gry pid:860033327 eyr:2020 hcl:#fffffd
#...#...#.. byr:1937 iyr:2017 cid:147 hgt:183cm
.#....#..#.
..#.#...#.# iyr:2013 ecl:amb cid:350 eyr:2023 pid:028048884
.#...##..#. hcl:#cfa07d byr:1929
..#.##.....
.#.#.#....# hcl:#ae17e1 iyr:2013
.#........# eyr:2024
#.##...#... ecl:brn pid:760753108 byr:1931
#...##....# hgt:179cm
.#..#...#.#
hcl:#cfa07d eyr:2025 pid:166559648
iyr:2011 ecl:brn hgt:59in

74
src/main.rs
View File

@ -1,58 +1,46 @@
use std::collections::HashMap;
use std::io::{stdin, Read}; use std::io::{stdin, Read};
#[derive(Debug, PartialEq, Eq)]
enum GridType {
Open,
Tree,
}
fn main() { fn main() {
let mut input = String::new(); let mut input = String::new();
stdin().read_to_string(&mut input).unwrap(); stdin().read_to_string(&mut input).unwrap();
let grid = input let passports: usize = input
.split('\n') .split("\n\n")
.filter(|x| !x.is_empty()) .filter(|x| !x.is_empty())
.into_iter() .into_iter()
.map(|x| x.replace('\n', " "))
.map(|x| { .map(|x| {
x.as_bytes() let mut map = HashMap::new();
.into_iter()
.map(|y| match y { x.split(' ').filter(|x| !x.is_empty()).for_each(|y| {
b'#' => GridType::Tree, let mut y = y.split(':');
b'.' => GridType::Open, let key = y.next().unwrap();
_ => unreachable!(), let value = y.next().unwrap();
})
.collect::<Vec<GridType>>() map.insert(key.to_owned(), value.to_owned());
});
map
}) })
.collect::<Vec<Vec<GridType>>>(); .filter(|map| {
validate(&map, "byr")
&& validate(&map, "iyr")
&& validate(&map, "eyr")
&& validate(&map, "hgt")
&& validate(&map, "hcl")
&& validate(&map, "ecl")
&& validate(&map, "pid")
})
.count();
let m = grid.len(); println!("{:?}", passports);
let n = grid[0].len();
println!("m = {} n = {}", m, n);
let a = calc_trees(&grid, m, n, 3, 1);
let b = calc_trees(&grid, m, n, 1, 1);
let c = calc_trees(&grid, m, n, 5, 1);
let d = calc_trees(&grid, m, n, 7, 1);
let e = calc_trees(&grid, m, n, 1, 2);
println!("{} {} {} {} {}", a, b, c, d, e);
println!("{}", a * b * c * d * e);
} }
fn calc_trees(grid: &[Vec<GridType>], m: usize, n: usize, slope_x: usize, slope_y: usize) -> u32 { fn validate(map: &HashMap<String, String>, key: &str) -> bool {
let mut sx = 0; if let Some(v) = map.get(key) {
let mut sy = 0; !v.is_empty()
let mut treecount = if grid[0][0] == GridType::Open { 0 } else { 1 }; } else {
false
while sx < m - 1 {
sy = (sy + slope_x) % n;
sx += slope_y;
if grid[sx][sy] == GridType::Tree {
treecount += 1;
}
} }
return treecount;
} }