96 lines
2.3 KiB
Rust
96 lines
2.3 KiB
Rust
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#[macro_use] extern crate text_io;
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use std::{fs, cmp};
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enum GuardAction {
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shift_start(Guard),
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shift_end(Guard),
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fall_asleep,
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wake_up,
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}
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struct Guard {
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events: Vec<Event>,
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id: i32,
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}
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#[derive(Eq)]
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struct DateTime {
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month: i32,
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day: i32,
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hour: i32,
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minute: i32,
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sortable_time: i32,
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}
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// Calculate the absolute minute count relative to 01/01 0:00. Months are assumed to have 31
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// days because we just want to ensure that a higher month always results in a higher
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// timestamp. Think of this as a primitive and less correct unix epoch.
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pub fn get_sortable_time(month: i32, day: i32, hour: i32, minute: i32) -> i32 {
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return minute + hour * 60 + day * 60 * 24 + month * 60 * 24 * 31;
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}
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impl DateTime {
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pub fn new(month: i32, day: i32, hour: i32, minute: i32) -> Self {
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DateTime {
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month,
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day,
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hour,
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minute,
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sortable_time: get_sortable_time(month, day, hour, minute)
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}
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}
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}
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impl Ord for DateTime {
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fn cmp(&self, other: &DateTime) -> cmp::Ordering {
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self.sortable_time.cmp(&other.sortable_time)
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}
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}
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impl PartialOrd for DateTime {
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fn partial_cmp(&self, other: &DateTime) -> Option<cmp::Ordering> {
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Some(other.cmp(self))
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}
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}
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impl PartialEq for DateTime {
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fn eq(&self, other: &DateTime) -> bool {
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self.sortable_time == other.sortable_time
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}
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}
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struct Event {
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datetime: DateTime,
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action: GuardAction,
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}
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impl Event {
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pub fn new(datetime: DateTime, action: GuardAction) -> Self {
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Event {
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datetime,
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action
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}
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}
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}
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fn parse_action(input: &String) -> GuardAction {
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return GuardAction::fall_asleep;
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}
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fn event_from_line(line: &String) -> Event {
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let (month, day, hour, minute, unparsed_action): (i32, i32, i32, i32, String);
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scan!(line.bytes() => "[1518-{}-{} {}:{}] {}", month, day, hour, minute, unparsed_action);
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let datetime = DateTime::new(month, day, hour, minute);
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return Event::new(datetime, parse_action(&unparsed_action));
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}
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fn main() {
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let file = fs::read_to_string("../input").expect("can’t access file");
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let lines: Vec<&str> = file.split("\n").collect();
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let mut events: Vec<Event> = Vec::new();
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for line in lines {
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events.push(event_from_line(&line.to_string()));
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}
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}
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