From cfd9b4f2ad1a09bedf7f764f84448a61faab54a3 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Tue, 19 Apr 2022 20:26:02 +0200
Subject: Refile for merging repos

---
 2018/src/bin/day_4.rs | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 2018/src/bin/day_4.rs

(limited to '2018/src/bin/day_4.rs')

diff --git a/2018/src/bin/day_4.rs b/2018/src/bin/day_4.rs
new file mode 100644
index 0000000..2010cf8
--- /dev/null
+++ b/2018/src/bin/day_4.rs
@@ -0,0 +1,116 @@
+extern crate advent_of_code_2018;
+use advent_of_code_2018::*;
+
+use std::str::FromStr;
+
+use std::error::Error;
+use std::path::PathBuf;
+use std::collections::HashMap;
+
+// cargo watch -cs "cargo run --release --bin day_4"
+
+#[derive(Debug, PartialOrd, Ord, PartialEq, Eq)]
+struct Event {
+    date: String,
+    hour: u32,
+    minute: u32,
+    what: EventType
+}
+
+#[derive(Debug, PartialOrd, Ord, PartialEq, Eq)]
+enum EventType {
+    BeginShift(u32),
+    Asleep,
+    Awake
+}
+
+impl FromStr for Event {
+    type Err = Box<Error>;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let date = s.split_whitespace().nth(0).unwrap().trim_matches('[').to_string();
+        let time = s.split_whitespace().nth(1).unwrap().trim_matches(']');
+        let hour = time.split(':').nth(0).unwrap().parse().unwrap();
+        let minute = time.split(':').nth(1).unwrap().parse().unwrap();
+        let guard = s.split_whitespace().nth(3).and_then(|x| x.trim_matches('#').parse().ok());
+
+        let what = match s.split_whitespace().nth(2).unwrap() {
+            "Guard" => EventType::BeginShift(guard.unwrap()),
+            "falls" => EventType::Asleep,
+            "wakes" => EventType::Awake,
+            _ => panic!("Unknown event")
+        };
+        
+        Ok(Event {
+            date,
+            hour, 
+            minute,
+            what
+        })
+    }
+}
+
+#[derive(Debug)]
+struct GuardSleepStats {
+    per_minute: HashMap<u32, u32>
+}
+
+impl GuardSleepStats {
+    fn new() -> GuardSleepStats {
+        GuardSleepStats {
+            per_minute: HashMap::new()
+        }
+    }
+    fn total(&self) -> u32 {
+        self.per_minute.values().sum()
+    }
+}
+
+
+fn main() -> Result<(), Box<Error>> {
+    let input = read_file(&PathBuf::from("inputs/4.txt"))?;
+
+    //println!("Input: {:?}", input);
+
+    let mut events: Vec<Event> = input.iter().map(|line| line.parse().unwrap()).collect();
+    events.sort();
+    //println!("Events: {:?}", events);
+
+
+    let mut sleep = HashMap::new();
+    let mut current_guard = 0;
+    let mut last_asleep = 0;
+    for event in events {
+        match event.what {
+            EventType::BeginShift(guard) => current_guard = guard,
+            EventType::Asleep => last_asleep = event.minute,
+            EventType::Awake => {
+                for i in last_asleep..event.minute {
+                    *sleep
+                        .entry(current_guard)
+                        .or_insert(GuardSleepStats::new())
+                        .per_minute
+                        .entry(i)
+                        .or_insert(0) += 1
+                }
+            }
+        }
+    }
+
+    println!("Stats: {:?}", sleep);
+
+    let (sleepiest_guard, sleepiest_stats) = sleep.iter().max_by_key(|(_,v)| v.total()).unwrap().clone();
+    println!("Sleepiest guard: {:?}", sleepiest_guard);
+    let (sleepiest_minute, sleepiest_occurances) = sleepiest_stats.per_minute.iter().max_by_key(|(_,v)| *v).unwrap().clone();
+    println!("Sleepiest minute: {:?}", sleepiest_minute);
+    println!("Part 1 answer: {}", sleepiest_guard * sleepiest_minute);
+
+
+    let (specific_minute_offender, specific_minute_stats) = sleep.iter().max_by_key(|(_,v)| v.per_minute.values().max().unwrap()).unwrap().clone();
+    println!("Specific minute: {:?}", specific_minute_offender);
+    let (specific_minute_minute, specific_minute_occurances) = specific_minute_stats.per_minute.iter().max_by_key(|(_,v)| *v).unwrap().clone();
+    println!("Specific Minute minute: {:?}", specific_minute_minute);
+    println!("Part 2 answer: {}", specific_minute_offender * specific_minute_minute);
+    
+    Ok(())
+}
-- 
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