adventofcode/days/2024/08.rs

use std::collections::HashMap;

use advent_of_code::{
    strings::{convert_to_array, line_to_char},
    Kartesian, Table,
};
use advent_of_code_macros::include_aoc;
use log::*;

include_aoc!(2024, 08);

const EMPTY: char = '.';

fn get_map(maximum: Kartesian<usize>) -> Vec<Vec<char>> {
    let mut resomap = Vec::new();
    let mut m = Vec::new();
    m.resize(maximum.y, EMPTY);
    resomap.resize(maximum.x, m);
    resomap
}

fn find_antennas(map: Table) -> HashMap<char, Vec<Kartesian<usize>>> {
    let mut positions = HashMap::new();
    let mut x = 0;
    let mut y;
    let len = map[0].len();
    for line in map.clone() {
        y = 0;
        for char in line {
            if char != EMPTY {
                if !positions.contains_key(&char) {
                    positions.insert(char, Vec::with_capacity(len));
                }
                positions.get_mut(&char).unwrap().push(Kartesian::new(x, y));
            }
            y += 1;
        }
        x += 1;
    }
    positions
}

fn get_resonance(points: Vec<Kartesian<usize>>, maximum: Kartesian<usize>, harmonic: bool) -> Vec<Kartesian<usize>> {
    let mut resonances = Vec::new();
    let mut diff;
    let mut direction;
    for outer in points.clone() {
        for inner in points.clone() {
            if outer == inner {
                continue;
            }
            (diff, direction) = inner.diff(outer);
            loop {
                if let Some(reso) = outer.move_dir(diff, direction) {
                    if reso.x < maximum.x && reso.y < maximum.y {
                        debug!("Found Point: {}", reso);
                        resonances.push(reso);
                        if !harmonic {
                            break;
                        }
                    } else {
                        break;
                    }
                } else {
                    break;
                }
            }
        }
    }
    resonances
}

fn main() {
    let map = convert_to_array::<_, _, '\n'>(DATA, line_to_char);
    let maximum = Kartesian::new(map.len(), map[0].len());
    let positions = find_antennas(map.clone());
    let mut tmp;
    let mut resonating_points = Vec::new();
    for (group, points) in positions.clone() {
        tmp = get_resonance(points.clone(), maximum, false);
        println!("Found {} resonances for {} antennas in group {}", tmp.len(), points.len(), group,);
        resonating_points.append(&mut tmp);
    }
    println!("Found {} points before dedup", resonating_points.len());
    resonating_points.dedup();
    println!("{} after simple dedup", resonating_points.len());
    resonating_points = resonating_points
        .iter()
        .filter(|x| {
            for (group, positions) in positions.clone() {
                if positions.contains(*x) {
                    println!("Discarded point {} because it is over an point of group {}", *x, group);
                    return false;
                }
            }
            true
        })
        .cloned()
        .collect();
    let mut resomap = map.clone();
    println!("There are {} Resonating points on the map after dedup.", resonating_points.len());
    if resonating_points.len() != 305 {
        println!("Wrong solution");
    }
    for point in resonating_points {
        resomap[point.x][point.y] = '~';
    }
    for line in 0..resomap.len() {
        print!("{:02}. ", line + 1);
        for char in map[line].clone() {
            print!("{}", char);
        }
        print!("|");
        for char in resomap[line].clone() {
            print!("{}", char);
        }
        println!();
    }
}