Day 7 Part 1 Attempt :(

src/input/day07_test1

@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483

src/input/day07_test2

@@ -0,0 +1,5 @@
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483

src/main.rs

@@ -14,7 +14,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
         Box::new(day04::Day04 {}),
         Box::new(day05::Day05 {}),
         Box::new(day06::Day06 {}),
-        // Box::new(day07::Day07 {}),
+        Box::new(day07::Day07 {}),
         // Box::new(day08::Day08 {}),
         // Box::new(day09::Day09 {}),
         // Box::new(day10::Day10 {}),
@@ -57,6 +57,9 @@ async fn main() -> Result<(), Box<dyn Error>> {
         println!("========= {}ms =========\n", day.time.as_millis());
     }
 
-    println!("Ran AoC 2023 in {}ms", SystemTime::now().duration_since(start_time)?.as_millis());
+    println!(
+        "Ran AoC 2023 in {}ms",
+        SystemTime::now().duration_since(start_time)?.as_millis()
+    );
     Ok(())
 }

src/solutions/day07.rs

@@ -1,13 +1,46 @@
+use std::collections::HashMap;
+
 use super::Solution;
 
 pub struct Day07 {}
 
+#[derive(Debug, Eq, PartialEq)]
+enum Hands {
+    HC = 1,
+    OP,
+    TP,
+    ThreeOAK,
+    FH,
+    FourOAK,
+    FiveOAK,
+}
+
 impl Solution for Day07 {
     fn part1(
         &self,
-        _input: &mut Vec<String>,
+        input: &mut Vec<String>,
     ) -> Result<Box<dyn std::fmt::Display + Sync>, Box<dyn std::error::Error>> {
-        Ok(Box::new("Ready"))
+        let hands = self.get_hands_from_string(input)?;
+        let mut totals = vec![];
+
+        for hand in hands.iter() {
+            totals.push((hand.0.clone(), hand.1, self.get_hand_type(&hand.0)? as u32));
+        }
+
+        totals.sort_by(|a, b| {
+            if a.2 == b.2 {
+                a.0.partial_cmp(&b.0).unwrap()
+            } else {
+                (a.2 as u32).cmp(&(b.2 as u32))
+            }
+        });
+
+        let mut score: u64 = 0;
+        for (i, cards) in totals.iter().enumerate() {
+            println!("{} * {}, {:?} {}", i + 1, cards.1, cards.0, cards.2);
+            score += (cards.1 * (i + 1) as u32) as u64;
+        }
+        Ok(Box::new(score))
     }
 
     fn part2(
@@ -22,7 +55,80 @@ impl Solution for Day07 {
     }
 }
 
-impl Day07 {}
+impl Day07 {
+    fn get_hands_from_string(
+        &self,
+        input: &mut Vec<String>,
+    ) -> Result<Vec<(Vec<u32>, u32)>, Box<dyn std::error::Error>> {
+        let mut hands = vec![];
+
+        // Get the string from each line and split into hand and stake
+        for hand in input {
+            let (card, mut stake) = hand.split_at(5);
+            stake = stake.trim();
+
+            let mut hand = vec![];
+            for i in card.chars() {
+                hand.push(match i {
+                    'T' => 10,
+                    'J' => 11,
+                    'Q' => 12,
+                    'K' => 13,
+                    'A' => 14,
+                    _ => i.to_digit(10).unwrap(),
+                });
+            }
+
+            hand.sort();
+            hands.push((hand.iter().rev().map(|c| *c).collect(), stake.parse()?));
+        }
+        Ok(hands)
+    }
+
+    fn get_hand_type(&self, hand: &Vec<u32>) -> Result<Hands, Box<dyn std::error::Error>> {
+        let mut map_cards = HashMap::new();
+
+        for c in hand {
+            map_cards.entry(c).and_modify(|c| *c += 1).or_insert(1u32);
+        }
+
+        let mut counts: Vec<&u32> = map_cards.values().into_iter().collect();
+        counts.sort();
+
+        // If there is a single key in the map we have 5OAK
+        if map_cards.len() == 1 {
+            return Ok(Hands::FiveOAK);
+        }
+
+        // 4OAK
+        // Full House
+        if map_cards.len() == 2 {
+            // 4OAK
+            if *counts[1] == 4u32 {
+                return Ok(Hands::FourOAK);
+            }
+            return Ok(Hands::FH);
+        }
+
+        if map_cards.len() == 3 {
+            // 3OAK
+            if *counts[2] == 3 {
+                return Ok(Hands::ThreeOAK);
+            }
+
+            // Two Pair
+            return Ok(Hands::TP);
+        }
+
+        // One Pair
+        if map_cards.len() == 4 {
+            return Ok(Hands::OP);
+        }
+
+        // High Card
+        Ok(Hands::HC)
+    }
+}
 
 /// Test from puzzle input
 #[cfg(test)]
@@ -44,7 +150,7 @@ mod test {
             .unwrap()
             .to_string();
 
-        assert_eq!(answer, "Ready");
+        assert_eq!(answer, "6440");
     }
 
     #[test]