Start on 2023 day 7

2023/day6/README.md

@@ -66,3 +66,28 @@ in this example, if you multiply these values together, you get **288** (4 * 8 *
 
 Determine the number of ways you could beat the record in each race. **What do you get if you multiply these numbers 
 together?**
+
+## Part 2
+
+As the race is about to start, you realize the piece of paper with race times and record distances you got earlier 
+actually just has very bad kerning. There's really **only one race** - ignore the spaces between the numbers on each line.
+
+So, the example from before:
+
+```
+Time:      7  15   30
+Distance:  9  40  200
+```
+
+...now instead means this:
+
+```
+Time:      71530
+Distance:  940200
+```
+
+Now, you have to figure out how many ways there are to win this single race. In this example, the race lasts for 
+**71530 milliseconds** and the record distance you need to beat is **940200 millimeters**. 
+You could hold the button anywhere from `14` to `71516` milliseconds and beat the record, a total of **71503** ways!
+
+**How many ways can you beat the record in this one much longer race?**

2023/day7/README.md

@@ -0,0 +1,78 @@
+# Day 7: Camel Cards
+
+## Part 1
+
+Your all-expenses-paid trip turns out to be a one-way, five-minute ride in an airship. (At least it's a **cool** 
+airship!) It drops you off at the edge of a vast desert and descends back to Island Island.
+
+"Did you bring the parts?"
+
+You turn around to see an Elf completely covered in white clothing, wearing goggles, and riding a large camel.
+
+"Did you bring the parts?" she asks again, louder this time. You aren't sure what parts she's looking for; you're 
+here to figure out why the sand stopped.
+
+"The parts! For the sand, yes! Come with me; I will show you." She beckons you onto the camel.
+
+After riding a bit across the sands of Desert Island, you can see what look like very large rocks covering half of the 
+horizon. The Elf explains that the rocks are all along the part of Desert Island that is directly above Island Island, 
+making it hard to even get there. Normally, they use big machines to move the rocks and filter the sand, but the 
+machines have broken down because Desert Island recently stopped receiving the **parts** they need to fix the machines.
+
+You've already assumed it'll be your job to figure out why the parts stopped when she asks if you can help. 
+You agree automatically.
+
+Because the journey will take a few days, she offers to teach you the game of **Camel Cards**. Camel Cards is sort of 
+similar to poker except it's designed to be easier to play while riding a camel.
+
+In Camel Cards, you get a list of **hands**, and your goal is to order them based on the strength of each hand. 
+A hand consists of five cards labeled one of `A`, `K`, `Q`, `J`, `T`, `9`, `8`, `7`, `6`, `5`, `4`, `3`, or `2`. 
+The relative strength of each card follows this order, where `A` is the highest and `2` is the lowest.
+
+Every hand is exactly one type. From strongest to weakest, they are:
+
+- **Five of a kind**, where all five cards have the same label: `AAAAA`
+- **Four of a kind**, where four cards have the same label and one card has a different label: `AA8AA`
+- **Full house**, where three cards have the same label, and the remaining two cards share a different label: `23332`
+- **Three of a kind**, where three cards have the same label, and the remaining two cards are each different from any other card in the hand: `TTT98`
+- **Two pair**, where two cards share one label, two other cards share a second label, and the remaining card has a third label: `23432`
+- **One pair**, where two cards share one label, and the other three cards have a different label from the pair and each other: `A23A4`
+- **High card**, where all cards' labels are distinct: `23456`
+
+Hands are primarily ordered based on type; for example, every **full house** is stronger than any **three of a kind**.
+
+If two hands have the same type, a second ordering rule takes effect. Start by comparing the **first card in each hand**. 
+If these cards are different, the hand with the stronger first card is considered stronger. If the first card in each 
+hand have the **same label**, however, then move on to considering the second card in each hand. If they differ, 
+the hand with the higher second card wins; otherwise, continue with the third card in each hand, then the fourth, 
+then the fifth.
+
+So, `33332` and `2AAAA` are both four of a kind hands, but `33332` is stronger because its first card is stronger. 
+Similarly, `77888` and `77788` are both a full house, but `77888` is stronger because its third card is stronger 
+(and both hands have the same first and second card).
+
+To play Camel Cards, you are given a list of hands and their corresponding bid (your puzzle input). For example:
+
+```
+32T3K 765
+T55J5 684
+KK677 28
+KTJJT 220
+QQQJA 483
+```
+
+This example shows five hands; each hand is followed by its **bid** amount. Each hand wins an amount equal to its bid 
+multiplied by its **rank**, where the weakest hand gets rank 1, the second-weakest hand gets rank 2, and so on up to 
+the strongest hand. Because there are five hands in this example, the strongest hand will have rank 5 and its bid will 
+be multiplied by 5.
+
+So, the first step is to put the hands in order of strength:
+
+- `32T3K` is the only **one pair** and the other hands are all a stronger type, so it gets rank **1**.
+- `KK677` and `KTJJT` are both **two pair**. Their first cards both have the same label, but the second card of `KK677` is stronger (K vs T), so `KTJJT` gets rank **2** and `KK677` gets rank **3**.
+- `T55J5` and `QQQJA` are both three of a kind. `QQQJA` has a stronger first card, so it gets rank **5** and `T55J5` gets rank **4**.
+
+Now, you can determine the total winnings of this set of hands by adding up the result of multiplying each hand's bid 
+with its rank (765 * 1 + 220 * 2 + 28 * 3 + 684 * 4 + 483 * 5). So the total winnings in this example are 6440.
+
+Find the rank of every hand in your set. **What are the total winnings?**

2023/day7/src/example-input.txt

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

2023/day7/src/main.rs

@@ -1,3 +1,12 @@
+const FILE_STR: &str = include_str!("input.txt");
+
 fn main() {
     println!("Hello, world!");
 }
+
+#[cfg(test)]
+mod test {
+    const EXAMPLE_FILE_STR: &str = include_str!("example-input.txt");
+
+    use super::*;
+}