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day 4 solution

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Andrew Coleman 2018-12-07 17:42:24 -05:00
parent ed8b988482
commit 9c31ed0700
3 changed files with 220 additions and 2 deletions

96
2018/day4/Cargo.lock generated Normal file
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@ -0,0 +1,96 @@
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View File

@ -4,3 +4,5 @@ version = "0.1.0"
authors = ["Andrew Coleman <penguincoder@gmail.com>"]
[dependencies]
regex = "1"
lazy_static = "1"

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@ -1,3 +1,123 @@
fn main() {
println!("Hello, world!");
#[macro_use]
extern crate lazy_static;
extern crate regex;
use regex::Regex;
use std::collections::HashMap;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::iter::Iterator;
type Day4Map = HashMap<u16, [u16; 60]>;
fn calc_minutes_from_lines(lines: &mut Vec<String>, map: &mut Day4Map, gid: u16, start: u16) {
lazy_static! {
static ref GUARD_RE: Regex =
Regex::new(r"^\[\d{4}-\d{2}-\d{2} \d{2}:\d{2}\] Guard #(\d+) begins shift$").unwrap();
static ref ASLEEP_RE: Regex =
Regex::new(r"^\[\d{4}-\d{2}-\d{2} \d{2}:(\d{2})\] falls asleep$").unwrap();
static ref AWAKE_RE: Regex =
Regex::new(r"^\[\d{4}-\d{2}-\d{2} \d{2}:(\d{2})\] wakes up$").unwrap();
}
let line = lines.remove(0);
let line = line.as_str();
let guard_id = if GUARD_RE.is_match(line) {
let caps = GUARD_RE.captures(line).unwrap();
caps[1].parse::<u16>().unwrap()
} else {
gid
};
let start_minute = if ASLEEP_RE.is_match(line) {
let caps = ASLEEP_RE.captures(line).unwrap();
caps[1].parse::<u16>().unwrap()
} else {
start
};
if AWAKE_RE.is_match(line) {
let caps = AWAKE_RE.captures(line).unwrap();
let end_minute = caps[1].parse::<u16>().unwrap();
map.entry(guard_id)
.and_modify(|e| {
for minute in (start_minute..end_minute).into_iter() {
e[usize::from(minute)] += 1;
}
})
.or_insert([0u16; 60]);
};
if lines.is_empty() {
return;
} else {
calc_minutes_from_lines(lines, map, guard_id, start_minute)
}
}
fn get_max_from_map(map: &mut Day4Map) -> HashMap<u16, u16> {
let mut count_map: HashMap<u16, u16> = HashMap::new();
let mut max_gid = 0;
let mut max_count = 0;
let mut max_minute = 0;
let mut most_max_gid = 0;
let mut most_max_minute = 0;
let mut most_max_minute_index = 0;
for (key, value) in map {
let sum = value.into_iter().sum();
if sum > max_count {
max_gid = *key;
max_count = sum;
let mut cur_max_min = 0;
for i in 0..value.len() {
if value[i] > cur_max_min {
cur_max_min = value[i];
max_minute = i as u16;
}
}
}
for i in 0..value.len() {
if value[i] > most_max_minute {
most_max_minute = value[i];
most_max_minute_index = i as u16;
most_max_gid = *key;
}
}
count_map.insert(*key, sum);
}
println!(
"max guard id is {} sum {}, max minute of {} with val of {}",
max_gid,
max_count,
max_minute,
max_gid * max_minute
);
println!(
"guard {} most asleep on a single minute {} with a count of {} is {}",
most_max_gid,
most_max_minute_index,
most_max_minute,
most_max_gid * most_max_minute_index
);
count_map
}
fn main() {
let mut lines: Vec<String> = BufReader::new(File::open("sorted-input").unwrap())
.lines()
.map(|line| line.unwrap())
.collect();
let mut map = Day4Map::new();
calc_minutes_from_lines(&mut lines, &mut map, 0, 0);
/*for (key, value) in &map {
print!("{}: ", key);
for r in value.iter() {
print!("{} ", r);
}
println!();
}*/
get_max_from_map(&mut map);
}