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/target |
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use std::io::BufRead; |
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|
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pub fn part1<F: BufRead> (input: F) { |
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let res: i32 = input.lines() |
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.filter_map(|line| line.unwrap().parse::<i32>().ok()) |
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.map(|mass| mass / 3 - 2) |
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.sum(); |
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println!("{}", res); |
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} |
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|
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fn recursive_fuel_mass(mass: i32) -> i32 { |
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let fuel_mass = mass / 3 - 2; |
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if fuel_mass <= 0 { |
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0 |
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} else { |
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fuel_mass + recursive_fuel_mass(fuel_mass) |
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} |
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} |
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|
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pub fn part2<F: BufRead> (input: F) { |
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let res: i32 = input.lines() |
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.filter_map(|line| line.unwrap().parse::<i32>().ok()) |
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.map(recursive_fuel_mass) |
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.sum(); |
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|
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println!("{}", res); |
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} |
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@ -0,0 +1,43 @@ |
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#[macro_use] |
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extern crate clap; |
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use clap::{Arg, App}; |
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use std::fs::File; |
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use std::io::BufReader; |
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|
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mod day1; |
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|
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fn main() { |
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let matches = App::new("Advent of Code 2019") |
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.version("0.1") |
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.arg(Arg::with_name("challenge") |
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.short("c") |
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.long("challenge") |
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.value_name("CHALLENGE") |
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.required(true) |
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.takes_value(true) |
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.min_values(1) |
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.max_values(50)) |
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.arg(Arg::with_name("input") |
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.short("i") |
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.long("input") |
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.value_name("INPUT") |
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.required(true) |
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.takes_value(true)) |
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.get_matches(); |
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let input = matches.value_of("input").unwrap(); |
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let challenge = value_t!(matches, "challenge", usize).unwrap() - 1; |
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|
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let input_file = File::open(input).expect("Unable to open input file"); |
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let reader = BufReader::new(input_file); |
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|
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let challenges = [ |
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day1::part1, day1::part2 |
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]; |
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|
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if let Some(f) = challenges.get(challenge) { |
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f(reader); |
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} else { |
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println!("Challenge {}, part {} not unimplemented", challenge / 2 + 1, challenge % 2 +1) |
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} |
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} |
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Reference in new issue