64 lines
2.0 KiB
Rust
64 lines
2.0 KiB
Rust
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use std::{fs, env, collections::HashMap};
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fn read_input(path: &str) -> String {
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return fs::read_to_string(path).expect("Cannot read file.");
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}
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fn parse_input(s: &str) -> Vec<Vec<u32>> {
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return s.lines()
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.map(|l| l.chars().filter_map(|e| e.to_digit(10)).collect())
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.collect();
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}
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fn expand_map(m: &Vec<Vec<u32>>) -> Vec<Vec<u32>> {
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let mut t = vec![];
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for l in 0..(5 * m.len()) {
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t.push(vec![]);
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for c in 0..(5 * m.len()) {
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let x = (m[l % m.len()][c % m[0].len()] + (l / m.len() + c / m[0].len()) as u32) % 9;
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t[l].push(if x == 0 { 9 } else { x });
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}
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}
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return t;
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}
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fn get_shortest_risk(m: &Vec<Vec<u32>>, mut l: usize, mut c: usize) -> u32 {
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let mut w = HashMap::new();
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w.insert((l, c), 0);
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let mut q = vec![(0, l, c)];
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while !q.is_empty() {
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let e = q.pop().unwrap();
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l = e.1;
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c = e.2;
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let z = *w.get(&(l, c)).unwrap();
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let mut p = vec![];
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if c > 0 { p.push((l, c - 1)); }
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if l > 0 { p.push((l - 1, c)); }
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if c < m[l].len() - 1 { p.push((l, c + 1)); }
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if l < m.len() - 1 { p.push((l + 1, c)); }
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while !p.is_empty() {
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let a = p.pop().unwrap();
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let x = *w.get(&a).unwrap_or(&u32::MAX);
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if x > z + m[a.0][a.1] {
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w.insert(a, z + m[a.0][a.1]);
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q.push((z + m[a.0][a.1], a.0, a.1));
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}
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}
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q.sort_by(|a, b| b.cmp(a));
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}
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return *w.get(&(m.len() - 1, m[m.len() - 1].len() - 1)).unwrap_or(&u32::MAX);
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}
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fn main() {
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let args: Vec<String> = env::args().collect();
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for arg in args.iter().skip(1) {
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let input = read_input(&arg);
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let vec_in = parse_input(&input);
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let exp = expand_map(&vec_in);
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println!("[{}]", &arg);
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println!("\t[Part 1] => Answer is '{}'.", get_shortest_risk(&vec_in, 0, 0));
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println!("\t[Part 2] => Answer is '{}'.", get_shortest_risk(&exp, 0, 0));
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}
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}
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