main.rs

#![feature(type_alias_impl_trait)]

mod matrix;

use matrix::Matrix;
use std::fs::read_to_string;

fn main() {
    let data = read_to_string("data.txt").unwrap();
    let mut datamat = Matrix::new_from_str(&data, |c| (c.to_digit(10).unwrap(), false));

    datamat.lines_mut().for_each(|line| {
        line.fold(-1, |acc, v| {
            if v.0 as i32 > acc {
                v.1 = true;
                v.0 as i32
            } else {
                acc
            }
        });
    });
    datamat.lines_mut().for_each(|line| {
        line.rev().fold(-1, |acc, v| {
            if v.0 as i32 > acc {
                v.1 = true;
                v.0 as i32
            } else {
                acc
            }
        });
    });

    datamat.collumns_mut().for_each(|col| {
        col.fold(-1, |acc, v| {
            if v.0 as i32 > acc {
                v.1 = true;
                v.0 as i32
            } else {
                acc
            }
        });
    });

    datamat.collumns_mut().for_each(|col| {
        col.rev().fold(-1, |acc, v| {
            if v.0 as i32 > acc {
                v.1 = true;
                v.0 as i32
            } else {
                acc
            }
        });
    });

    datamat.lines().for_each(|v| {
        v.for_each(|x| print!("{}", if x.1 { 'A' } else { '_' }));
        println!();
    });

    let visible = datamat.elements.iter().filter(|v| v.1).count();
    println!("Visible trees: {visible}");
}