Completed day 7 part 1
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101
inputs/7.txt
Executable file
101
inputs/7.txt
Executable file
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Step I must be finished before step Q can begin.
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Step B must be finished before step O can begin.
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Step J must be finished before step M can begin.
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Step W must be finished before step Y can begin.
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Step U must be finished before step X can begin.
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Step T must be finished before step Q can begin.
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Step G must be finished before step M can begin.
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Step K must be finished before step C can begin.
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Step F must be finished before step Z can begin.
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Step D must be finished before step A can begin.
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Step N must be finished before step Y can begin.
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Step Y must be finished before step Q can begin.
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Step Q must be finished before step Z can begin.
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Step V must be finished before step E can begin.
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Step A must be finished before step X can begin.
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Step E must be finished before step C can begin.
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Step O must be finished before step R can begin.
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Step P must be finished before step L can begin.
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Step H must be finished before step R can begin.
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Step M must be finished before step R can begin.
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Step C must be finished before step Z can begin.
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Step R must be finished before step L can begin.
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Step L must be finished before step S can begin.
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Step S must be finished before step X can begin.
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Step Z must be finished before step X can begin.
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Step T must be finished before step O can begin.
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Step D must be finished before step Z can begin.
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Step P must be finished before step R can begin.
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Step M must be finished before step Z can begin.
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Step L must be finished before step Z can begin.
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Step W must be finished before step N can begin.
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Step Q must be finished before step R can begin.
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Step P must be finished before step C can begin.
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Step U must be finished before step O can begin.
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Step F must be finished before step O can begin.
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Step K must be finished before step X can begin.
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Step G must be finished before step K can begin.
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Step M must be finished before step C can begin.
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Step Y must be finished before step Z can begin.
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Step A must be finished before step O can begin.
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Step D must be finished before step P can begin.
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Step K must be finished before step S can begin.
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Step I must be finished before step E can begin.
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Step G must be finished before step F can begin.
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Step S must be finished before step Z can begin.
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Step N must be finished before step V can begin.
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Step F must be finished before step D can begin.
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Step A must be finished before step Z can begin.
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Step F must be finished before step X can begin.
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Step T must be finished before step Y can begin.
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Step W must be finished before step H can begin.
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Step D must be finished before step H can begin.
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Step W must be finished before step G can begin.
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Step J must be finished before step X can begin.
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Step T must be finished before step X can begin.
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Step U must be finished before step R can begin.
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Step O must be finished before step P can begin.
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Step L must be finished before step X can begin.
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Step I must be finished before step B can begin.
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Step M must be finished before step L can begin.
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Step C must be finished before step R can begin.
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Step R must be finished before step X can begin.
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Step F must be finished before step N can begin.
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Step V must be finished before step H can begin.
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Step K must be finished before step A can begin.
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Step W must be finished before step O can begin.
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Step U must be finished before step Q can begin.
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Step O must be finished before step C can begin.
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Step K must be finished before step V can begin.
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Step R must be finished before step S can begin.
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Step E must be finished before step S can begin.
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Step J must be finished before step A can begin.
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Step E must be finished before step X can begin.
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Step K must be finished before step Y can begin.
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Step Y must be finished before step X can begin.
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Step P must be finished before step Z can begin.
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Step W must be finished before step X can begin.
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Step Y must be finished before step A can begin.
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Step V must be finished before step X can begin.
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Step O must be finished before step M can begin.
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Step I must be finished before step J can begin.
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Step W must be finished before step L can begin.
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Step I must be finished before step G can begin.
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Step D must be finished before step O can begin.
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Step D must be finished before step N can begin.
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Step M must be finished before step X can begin.
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Step I must be finished before step R can begin.
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Step Y must be finished before step M can begin.
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Step F must be finished before step M can begin.
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Step U must be finished before step M can begin.
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Step Y must be finished before step H can begin.
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Step K must be finished before step D can begin.
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Step N must be finished before step O can begin.
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Step H must be finished before step S can begin.
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Step G must be finished before step L can begin.
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Step T must be finished before step D can begin.
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Step J must be finished before step N can begin.
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Step K must be finished before step M can begin.
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Step K must be finished before step P can begin.
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Step E must be finished before step R can begin.
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Step N must be finished before step H can begin.
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7
inputs/7_test.txt
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7
inputs/7_test.txt
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Step C must be finished before step A can begin.
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Step C must be finished before step F can begin.
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Step A must be finished before step B can begin.
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Step A must be finished before step D can begin.
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Step B must be finished before step E can begin.
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Step D must be finished before step E can begin.
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Step F must be finished before step E can begin.
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132
src/day7.rs
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132
src/day7.rs
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extern crate regex;
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use std::error::Error;
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use std::fs::File;
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use std::io::{BufRead, BufReader};
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use std::fmt;
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use std::collections::HashMap;
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use regex::{Regex, Captures};
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const INPUT: &str = "inputs/7.txt";
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#[derive(Debug, Clone, PartialEq)]
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struct MalformedInstruction {
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details: String
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}
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impl MalformedInstruction {
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fn new(msg: &str) -> MalformedInstruction {
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MalformedInstruction{ details: msg.to_string() }
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}
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}
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impl fmt::Display for MalformedInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", self.details)
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}
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}
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impl Error for MalformedInstruction {
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fn description(&self) -> &str {
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&self.details
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}
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}
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pub fn solve_part1() -> Result<String, Box<Error>> {
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let mut instructions = read_instructions(INPUT)?;
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Ok(get_step_sequence(&mut instructions))
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}
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fn read_instructions(filename: &str) -> Result<HashMap<String, Vec<String>>, Box<Error>> {
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let mut instructions: HashMap<String, Vec<String>> = HashMap::new();
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lazy_static! {
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static ref INSTRUCTION_REGEX: Regex = Regex::new(
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r"Step (?P<dependency>\w) must be finished before step (?P<step>\w) can begin."
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).unwrap();
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}
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let file = File::open(filename)?;
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for (index, line) in BufReader::new(file).lines().enumerate() {
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match INSTRUCTION_REGEX.captures(&line?) {
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Some(captures) => {
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let step = get_captured_field(&captures, "step")?.parse()?;
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let dependency: String = get_captured_field(&captures, "dependency")?.parse()?;
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instructions.entry(dependency.clone()).or_insert(Vec::new());
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let dependencies = instructions.entry(step).or_insert(Vec::new());
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dependencies.push(dependency);
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},
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None => return Err(Box::new(MalformedInstruction {
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details: "Malformed instruction line, no fields could be found".to_string()
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})),
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};
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}
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Ok(instructions)
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}
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fn get_captured_field(captures: &Captures, field: &str) -> Result<String, Box<Error>> {
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match captures.name(field) {
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Some(capture) => Ok(String::from(capture.as_str())),
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None => return Err(Box::new(MalformedInstruction {
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details: format!("Malformed instruction line, field {} could not be found", field)
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}))
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}
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}
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fn get_step_sequence(instructions: &mut HashMap<String, Vec<String>>) -> String {
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let mut sequence: Vec<String> = Vec::new();
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loop {
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let mut available: Vec<String> = instructions
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.iter()
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.filter(|(_, dependencies)| dependencies.len() == 0)
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.map(|(step, _)| step.clone())
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.collect();
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if available.len() == 0 { break; }
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available.sort();
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available.reverse();
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let next = available.pop().unwrap();
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instructions.remove(&next);
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for dependencies in instructions.values_mut() {
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match dependencies.iter().position(|d| *d == next) {
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Some(index) => { dependencies.remove(index); },
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None => ()
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}
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}
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sequence.push(next);
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}
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sequence.join("")
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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const TEST_INPUT: &str = "inputs/7_test.txt";
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#[test]
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fn reads_instructions_file() {
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let expected: HashMap<String, Vec<String>> = [
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("A".to_string(), vec!["C".to_string()]),
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("F".to_string(), vec!["C".to_string()]),
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("C".to_string(), vec![]),
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("B".to_string(), vec!["A".to_string()]),
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("D".to_string(), vec!["A".to_string()]),
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("E".to_string(), vec!["B".to_string(), "D".to_string(), "F".to_string()]),
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].iter().cloned().collect();
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assert_eq!(read_instructions(TEST_INPUT).unwrap(), expected);
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}
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#[test]
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fn gets_step_sequence() {
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let mut instructions: HashMap<String, Vec<String>> = [
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("A".to_string(), vec!["C".to_string()]),
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("F".to_string(), vec!["C".to_string()]),
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("C".to_string(), vec![]),
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("B".to_string(), vec!["A".to_string()]),
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("D".to_string(), vec!["A".to_string()]),
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("E".to_string(), vec!["B".to_string(), "D".to_string(), "F".to_string()]),
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].iter().cloned().collect();
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assert_eq!(get_step_sequence(&mut instructions), "CABDFE");
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}
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}
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@ -7,6 +7,7 @@ mod day3;
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mod day4;
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mod day5;
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mod day6;
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mod day7;
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fn main() {
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// println!("Day 1:");
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// println!("Day 5:");
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// println!("{}", day5::solve_part1().unwrap());
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// println!("{}", day5::solve_part2().unwrap());
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println!("Day 6:");
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println!("{}", day6::solve_part1().unwrap());
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println!("{}", day6::solve_part2().unwrap());
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// println!("Day 6:");
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// println!("{}", day6::solve_part1().unwrap());
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// println!("{}", day6::solve_part2().unwrap());
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println!("Day 7:");
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println!("{}", day7::solve_part1().unwrap());
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}
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