pub fn process_part1(input: &str) -> u32 {
    input
        .lines()
        .map(|line| {
            let line_len = line.len();
            let nums = line.chars().map(|char| char.to_digit(10).unwrap());
            let mut highest = (0, 0);
            for (idx, num) in nums.enumerate() {
                if num > highest.0 && idx + 1 != line_len {
                    highest.0 = num;
                    highest.1 = 0;
                } else if num > highest.1 {
                    highest.1 = num;
                }
            }
            highest.0 * 10 + highest.1
        })
        .sum()
}

pub fn process_part2(input: &str) -> u64 {
    input
        .lines()
        .map(|line| {
            let line_len = line.len();
            let nums = line.chars().map(|char| char.to_digit(10).unwrap() as u64);
            let mut highest = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
            for (idx, num) in nums.enumerate() {
                if num > highest.0 && idx + 1 < line_len - 10 {
                    highest.0 = num;
                    highest.1 = 0;
                    highest.2 = 0;
                    highest.3 = 0;
                    highest.4 = 0;
                    highest.5 = 0;
                    highest.6 = 0;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.1 && idx + 1 < line_len - 9 {
                    highest.1 = num;
                    highest.2 = 0;
                    highest.3 = 0;
                    highest.4 = 0;
                    highest.5 = 0;
                    highest.6 = 0;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.2 && idx + 1 < line_len - 8 {
                    highest.2 = num;
                    highest.3 = 0;
                    highest.4 = 0;
                    highest.5 = 0;
                    highest.6 = 0;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.3 && idx + 1 < line_len - 7 {
                    highest.3 = num;
                    highest.4 = 0;
                    highest.5 = 0;
                    highest.6 = 0;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.4 && idx + 1 < line_len - 6 {
                    highest.4 = num;
                    highest.5 = 0;
                    highest.6 = 0;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.5 && idx + 1 < line_len - 5 {
                    highest.5 = num;
                    highest.6 = 0;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.6 && idx + 1 < line_len - 4 {
                    highest.6 = num;
                    highest.7 = 0;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.7 && idx + 1 < line_len - 3 {
                    highest.7 = num;
                    highest.8 = 0;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.8 && idx + 1 < line_len - 2 {
                    highest.8 = num;
                    highest.9 = 0;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.9 && idx + 1 < line_len - 1 {
                    highest.9 = num;
                    highest.10 = 0;
                    highest.11 = 0;
                } else if num > highest.10 && idx + 1 < line_len {
                    highest.10 = num;
                    highest.11 = 0;
                } else if num > highest.11 {
                    highest.11 = num;
                }
            }
            let res = highest.0 * 100000000000
                + highest.1 * 10000000000
                + highest.2 * 1000000000
                + highest.3 * 100000000
                + highest.4 * 10000000
                + highest.5 * 1000000
                + highest.6 * 100000
                + highest.7 * 10000
                + highest.8 * 1000
                + highest.9 * 100
                + highest.10 * 10
                + highest.11;
            res
        })
        .sum()
}

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

    const INPUT: &str = "987654321111111
811111111111119
234234234234278
818181911112111";

    #[test]
    fn part1() {
        let result = process_part1(INPUT);
        assert_eq!(result, 357);
    }

    #[test]
    fn part2() {
        let result = process_part2(INPUT);
        assert_eq!(result, 3121910778619);
    }
}