Säähavainnot

use std::{
    io::{self, BufRead},
    iter,
};

fn main() {
    let reader = io::stdin().lock();
    run(reader);
}

fn run<T>(mut reader: T)
where
    T: BufRead,
{
    let mut input = String::new();
    reader.read_line(&mut input).unwrap();

    let _n: i32 = input
        .trim()
        .parse()
        .expect("first line of input should be the number of days");

    reader.lines().for_each(|line| {
        println!(
            "{}",
            iter::repeat(
                &line
                    .unwrap()
                    .split_whitespace()
                    .skip(23)
                    .next()
                    .unwrap()
                    .parse::<f64>()
                    .unwrap()
                    .to_string()[..],
            )
            .take(3)
            .chain(iter::repeat("?"))
            .take(12)
            .collect::<Vec<&str>>()
            .join(" ")
        );
    });
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::{fs::File, io::BufReader};

    #[test]
    fn example_input() {
        let file =
            File::open("in.txt").expect("there should be an example input file named `in.txt`");
        let reader = BufReader::new(file);
        run(reader);
    }

    #[test]
    fn custom() {
        let data_file_name = "data.txt";
        let file = File::open(data_file_name)
            .unwrap_or_else(|_| panic!("expected to find file `{}`", data_file_name));
        let reader = BufReader::new(file);
        run(reader);
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED