#[aoc(day3, part1)]
pub fn part1(input: &str) -> u32 {
    input.split("\n").map(|line| get_joltage(line)).sum()
}

fn get_joltage(line: &str) -> u32 {
    let len = line.len();
    let (revpos_1, val_1) = line[..(len - 1)]
        .chars()
        .rev()
        .enumerate()
        .max_by(|x, y| x.1.cmp(&y.1))
        .unwrap();

    let val_2 = line[(len - 1 - revpos_1)..].chars().max().unwrap();
    let result = val_1.to_digit(10).unwrap() * 10 + val_2.to_digit(10).unwrap();

    result
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_part1_1() {
        let input = String::from(
            "987654321111111
811111111111119
234234234234278
818181911112111",
        );
        assert_eq!(part1(&input), 357)
    }
    #[test]
    fn test_part1_2() {
        let input = String::from(
            "9891111111111111111
111111111111111
818181911112111",
        );
        assert_eq!(part1(&input), 99 + 11 + 92)
    }
}