use std::io::{self, Read};
type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
fn main() -> Result<()> {
    let mut input = String::new();
    io::stdin().read_to_string(&mut input)?;
    let vector = parse(input);
    part1(&vector, 3, 1);
    part2(&vector);
    Ok(())
}
fn part2(vector: &Vec<Vec<bool>>) {
    let mut ans: usize = 1;
    ans *= part1(&vector, 1, 1);
    ans *= part1(&vector, 3, 1);
    ans *= part1(&vector, 5, 1);
    ans *= part1(&vector, 7, 1);
    ans *= part1(&vector, 1, 2);
    println!("{}", ans);
}
fn part1(vector: &Vec<Vec<bool>>, x: usize, y: usize) -> usize {
    let mut x_co = 0;
    let mut y_co = 0;
    let mut value = 0;
    loop {
        if vector[y_co][x_co % 31] == true {
            value += 1;
        }
        x_co += x;
        y_co += y;
        // we are adding the value and then checking so no `vector.len() - 1`
        if vector.len() <= y_co {
            break;
        }
    }
    value
}
fn parse(input: String) -> Vec<Vec<bool>> {
    let mut vector = vec![];
    for (_y, line) in input.lines().enumerate() {
        let mut vec = vec![false; 31];
        for (x, char) in line.trim().chars().enumerate() {
            if char == '#' {
                vec[x] = true;
            } else {
                vec[x] = false;
            }
        }
        vector.push(vec);
    }
    vector
}

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[package]
name = "aoc03"
version = "0.1.0"
authors = ["henil <dedaniahenil@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "aoc03"
version = "0.1.0"