use std::{
    fs::File,
    io::{BufRead, BufReader},
    str::FromStr,
};

use anyhow::Result;
use num_bigint::BigUint;

fn main() -> Result<()> {
    let file = File::open("p13/input.txt")?;
    let reader = BufReader::new(file);
    let mut numbers: Vec<BigUint> = Vec::new();
    for line in reader.lines() {
        let line = line?;
        let trimmed = line.trim();
        if !trimmed.is_empty() {
            let big_num = BigUint::from_str(trimmed).unwrap();
            numbers.push(big_num);
        }
    }
    let result: BigUint = numbers.iter().sum();
    println!("{result}");
    Ok(())
}