fn main() {
    let mut hill: Vec<String> = Vec::new();
    let contents = std::fs::read_to_string("input1").unwrap();
    for s in contents.lines() {
        hill.push(s.parse::<String>().unwrap());
    }

    let rounds = [[1, 1], [3, 1], [5, 1], [7, 1], [1, 2]];
    // let rounds = [[1, 2]];
    let mut hit_trees = Vec::new();
    for r in rounds.iter() {
        let right_rule = r[0];
        let down_rule = r[1];
        let mut right_pos = 0;
        let mut down_pos = 0;
        let mut trees: i64 = 0;
        loop {
            for _ in 0..right_rule {
                if right_pos == hill[down_pos].len() - 1 {
                    right_pos = 0;
                } else {
                    right_pos += 1;
                }
            }
            down_pos += down_rule;
            if hill[down_pos].chars().nth(right_pos).unwrap() == '#' {
                trees += 1;
            }
            if hill.len() - 1 == down_pos {
                break;
            }
        }
        hit_trees.push(trees);
    }
    let total = hit_trees[0] * hit_trees[1] * hit_trees[2] * hit_trees[3] * hit_trees[4];
    print!("You hit {} total trees!\n", total);
}