From cee59608de180349af58c66d52455acfa7fb44cb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Th=C3=A9o=20LUDWIG?= Date: Fri, 8 Dec 2023 18:29:27 +0100 Subject: [PATCH 1/2] feat: add day 3 - part 2 --- day_3/README.md | 2 +- day_3/src/lib.rs | 126 ++++++++++++++++++++++++++++++++++++++++++---- day_3/src/main.rs | 4 +- 3 files changed, 120 insertions(+), 12 deletions(-) diff --git a/day_3/README.md b/day_3/README.md index 1555ad4..990527e 100644 --- a/day_3/README.md +++ b/day_3/README.md @@ -72,6 +72,6 @@ In this schematic, there are **two** gears. The first is in the top left; it has **What is the sum of all of the gear ratios in your engine schematic?** -Your puzzle answer was `answer`. +Your puzzle answer was `84363105`. **Both parts of this puzzle are complete! They provide two gold stars: `**`.** diff --git a/day_3/src/lib.rs b/day_3/src/lib.rs index 17a280c..ca3730b 100644 --- a/day_3/src/lib.rs +++ b/day_3/src/lib.rs @@ -1,8 +1,17 @@ -#[derive(Debug, PartialEq)] +use std::collections::HashMap; + +#[derive(Debug, PartialEq, Default, Clone, Copy)] +pub struct GearPosition { + pub index_line: usize, + pub index_character: usize, +} + +#[derive(Debug, PartialEq, Default, Clone, Copy)] pub struct NumberPosition { pub index_start: usize, pub index_end: usize, pub value: usize, + pub gear_position: GearPosition, } pub fn get_numbers_positions_from_line(line: &str) -> Vec { @@ -23,6 +32,7 @@ pub fn get_numbers_positions_from_line(line: &str) -> Vec { index_start, index_end, value, + gear_position: GearPosition::default(), }); number_string = String::from(""); index_start = 0; @@ -35,6 +45,7 @@ pub fn get_numbers_positions_from_line(line: &str) -> Vec { index_start, index_end, value, + gear_position: GearPosition::default(), }); } result @@ -44,6 +55,10 @@ pub fn is_symbol(character: char) -> bool { !character.is_ascii_digit() && character != '.' } +pub fn is_gear_symbol(character: char) -> bool { + character == '*' +} + pub fn part_1(input: &str) -> usize { let lines = input.lines().collect::>(); lines @@ -82,15 +97,108 @@ pub fn part_1(input: &str) -> usize { || has_symbol_on_the_top || has_symbol_on_the_bottom }) - .map(|matching_number| matching_number.value) + .map(|number_position| number_position.value) .sum::() }) .sum() } -// pub fn part_2(_input: &str) -> usize { -// 42 -// } +pub fn part_2(input: &str) -> usize { + let lines = input.lines().collect::>(); + let mut number_positions = vec![]; + + lines.iter().enumerate().for_each(|(index_line, &line)| { + get_numbers_positions_from_line(line) + .iter() + .for_each(|&number_position| { + let index_start = number_position.index_start.saturating_sub(1); + let index_end = if number_position.index_end + 1 >= line.len() { + line.len().saturating_sub(1) + } else { + number_position.index_end + 1 + }; + + let has_symbol_on_the_left = + line.chars().nth(index_start).is_some_and(is_gear_symbol); + if has_symbol_on_the_left { + let mut number_position = number_position.to_owned(); + number_position.gear_position.index_line = index_line; + number_position.gear_position.index_character = index_start; + number_positions.push(number_position); + } + + let has_symbol_on_the_right = + line.chars().nth(index_end).is_some_and(is_gear_symbol); + if has_symbol_on_the_right { + let mut number_position = number_position.to_owned(); + number_position.gear_position.index_line = index_line; + number_position.gear_position.index_character = index_end; + number_positions.push(number_position); + } + + let index_character_top = + lines.get(index_line.saturating_sub(1)).and_then(|&line| { + line.get(index_start..=index_end) + .and_then(|value| value.chars().position(is_gear_symbol)) + }); + if let Some(index_character_top) = index_character_top { + let mut number_position = number_position.to_owned(); + number_position.gear_position.index_line = index_line.saturating_sub(1); + number_position.gear_position.index_character = + index_character_top + index_start; + number_positions.push(number_position); + } + + let index_character_bottom = lines.get(index_line + 1).and_then(|&line| { + line.get(index_start..=index_end) + .and_then(|value| value.chars().position(is_gear_symbol)) + }); + if let Some(index_character_bottom) = index_character_bottom { + let mut number_position = number_position.to_owned(); + number_position.gear_position.index_line = index_line + 1; + number_position.gear_position.index_character = + index_character_bottom + index_start; + number_positions.push(number_position); + } + }); + }); + + // Key: "index_line-index_character" + // Value: usize + let mut gear_positions: HashMap> = HashMap::new(); + + number_positions.iter().for_each(|&number_position| { + let key = format!( + "{}-{}", + number_position.gear_position.index_line, number_position.gear_position.index_character, + ); + match gear_positions.get_mut(&key) { + Some(gear_positions) => { + gear_positions.push(number_position.value); + } + None => { + gear_positions.insert(key, vec![number_position.value]); + } + } + }); + + let mut result = 0; + + for (_, value) in gear_positions.iter() { + if value.len() != 2 { + continue; + } + + let first_number = value.first(); + let second_number = value.last(); + + if let (Some(first_number), Some(second_number)) = (first_number, second_number) { + result += first_number * second_number; + } + } + + result +} #[cfg(test)] mod day_3_tests { @@ -101,8 +209,8 @@ mod day_3_tests { assert_eq!(part_1(include_str!("../input_example_1.txt")), 4361); } - // #[test] - // fn test_part_2_example() { - // assert_eq!(part_2(include_str!("../input_example_1.txt")), 467835); - // } + #[test] + fn test_part_2_example() { + assert_eq!(part_2(include_str!("../input_example_1.txt")), 467835); + } } diff --git a/day_3/src/main.rs b/day_3/src/main.rs index 31b334d..896b5f5 100644 --- a/day_3/src/main.rs +++ b/day_3/src/main.rs @@ -1,8 +1,8 @@ -use day_3::part_1; +use day_3::{part_1, part_2}; fn main() { let input = include_str!("../input.txt"); println!("- Day 3: Gear Ratios -"); println!("Answer Part 1: {}", part_1(input)); - // println!("Answer Part 2: {}", part_2(input)); + println!("Answer Part 2: {}", part_2(input)); } From bf03a758c34f09b2c695bc4cfdcbb4bec5daf315 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Th=C3=A9o=20LUDWIG?= Date: Fri, 8 Dec 2023 18:29:39 +0100 Subject: [PATCH 2/2] feat: add day 4 --- Cargo.lock | 4 + Cargo.toml | 1 + day_4/.gitignore | 1 + day_4/Cargo.toml | 6 ++ day_4/README.md | 85 ++++++++++++++++ day_4/input.txt | 208 ++++++++++++++++++++++++++++++++++++++ day_4/input_example_1.txt | 6 ++ day_4/src/lib.rs | 163 +++++++++++++++++++++++++++++ day_4/src/main.rs | 8 ++ 9 files changed, 482 insertions(+) create mode 100644 day_4/.gitignore create mode 100644 day_4/Cargo.toml create mode 100644 day_4/README.md create mode 100644 day_4/input.txt create mode 100644 day_4/input_example_1.txt create mode 100644 day_4/src/lib.rs create mode 100644 day_4/src/main.rs diff --git a/Cargo.lock b/Cargo.lock index 0b8147e..c10a016 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -13,3 +13,7 @@ version = "1.0.0" [[package]] name = "day_3" version = "1.0.0" + +[[package]] +name = "day_4" +version = "1.0.0" diff --git a/Cargo.toml b/Cargo.toml index 0d8abf2..0617796 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -3,5 +3,6 @@ members = [ "day_1", "day_2", "day_3", + "day_4", ] resolver = "2" diff --git a/day_4/.gitignore b/day_4/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/day_4/.gitignore @@ -0,0 +1 @@ +/target diff --git a/day_4/Cargo.toml b/day_4/Cargo.toml new file mode 100644 index 0000000..4d4e39c --- /dev/null +++ b/day_4/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "day_4" +version = "1.0.0" +edition = "2021" + +[dependencies] diff --git a/day_4/README.md b/day_4/README.md new file mode 100644 index 0000000..7d00eb6 --- /dev/null +++ b/day_4/README.md @@ -0,0 +1,85 @@ +# - Day 4: Scratchcards - + +Source: + +## Instructions - Part 1 + +The gondola takes you up. Strangely, though, the ground doesn't seem to be coming with you; you're not climbing a mountain. As the circle of Snow Island recedes below you, an entire new landmass suddenly appears above you! The gondola carries you to the surface of the new island and lurches into the station. + +As you exit the gondola, the first thing you notice is that the air here is much **warmer** than it was on Snow Island. It's also quite **humid**. Is this where the water source is? + +The next thing you notice is an Elf sitting on the floor across the station in what seems to be a pile of colorful square cards. + +"Oh! Hello!" The Elf excitedly runs over to you. "How may I be of service?" You ask about water sources. + +"I'm not sure; I just operate the gondola lift. That does sound like something we'd have, though - this is **Island Island**, after all! I bet the **gardener** would know. He's on a different island, though - er, the small kind surrounded by water, not the floating kind. We really need to come up with a better naming scheme. Tell you what: if you can help me with something quick, I'll let you **borrow my boat** and you can go visit the gardener. I got all these [scratchcards](https://en.wikipedia.org/wiki/Scratchcard) as a gift, but I can't figure out what I've won." + +The Elf leads you over to the pile of colorful cards. There, you discover dozens of scratchcards, all with their opaque covering already scratched off. Picking one up, it looks like each card has two lists of numbers separated by a vertical bar (`|`): a list of **winning numbers** and then a list of **numbers you have**. You organize the information into a table (your puzzle input). + +As far as the Elf has been able to figure out, you have to figure out which of the **numbers you have** appear in the list of **winning numbers**. The first match makes the card worth **one point** and each match after the first **doubles** the point value of that card. + +For example: + +```txt +Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53 +Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19 +Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1 +Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83 +Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36 +Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11 +``` + +In the above example, card 1 has five winning numbers (`41`, `48`, `83`, `86`, and `17`) and eight numbers you have (`83`, `86`, `6`, `31`, `17`, `9`, `48`, and `53`). Of the numbers you have, four of them (`48`, `83`, `17`, and `86`) are winning numbers! That means card 1 is worth **`8`** points (1 for the first match, then doubled three times for each of the three matches after the first). + +- Card 2 has two winning numbers (`32` and `61`), so it is worth **`2`** points. +- Card 3 has two winning numbers (`1` and `21`), so it is worth **`2`** points. +- Card 4 has one winning number (`84`), so it is worth **`1`** point. +- Card 5 has no winning numbers, so it is worth no points. +- Card 6 has no winning numbers, so it is worth no points. + +So, in this example, the Elf's pile of scratchcards is worth **`13`** points. + +Take a seat in the large pile of colorful cards. **How many points are they worth in total?** + +To begin, [get your puzzle input](./input.txt). + +Your puzzle answer was `24160`. + +**The first half of this puzzle is complete! It provides one gold star: `*`.** + +## Instructions - Part 2 + +Just as you're about to report your findings to the Elf, one of you realizes that the rules have actually been printed on the back of every card this whole time. + +There's no such thing as "points". Instead, scratchcards only cause you to **win more scratchcards** equal to the number of winning numbers you have. + +Specifically, you win **copies** of the scratchcards below the winning card equal to the number of matches. So, if card 10 were to have 5 matching numbers, you would win one copy each of cards 11, 12, 13, 14, and 15. + +Copies of scratchcards are scored like normal scratchcards and have the **same card number** as the card they copied. So, if you win a copy of card 10 and it has 5 matching numbers, it would then win a copy of the same cards that the original card 10 won: cards 11, 12, 13, 14, and 15. This process repeats until none of the copies cause you to win any more cards. (Cards will never make you copy a card past the end of the table.) + +This time, the above example goes differently: + +```txt +Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53 +Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19 +Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1 +Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83 +Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36 +Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11 +``` + +- Card 1 has four matching numbers, so you win one copy each of the next four cards: cards 2, 3, 4, and 5. +- Your original card 2 has two matching numbers, so you win one copy each of cards 3 and 4. +- Your copy of card 2 also wins one copy each of cards 3 and 4. +- Your four instances of card 3 (one original and three copies) have two matching numbers, so you win **four** copies each of cards 4 and 5. +- Your eight instances of card 4 (one original and seven copies) have one matching number, so you win **eight** copies of card 5. +- Your fourteen instances of card 5 (one original and thirteen copies) have no matching numbers and win no more cards. +- Your one instance of card 6 (one original) has no matching numbers and wins no more cards. + +Once all of the originals and copies have been processed, you end up with 1 instance of card 1, **`2`** instances of card 2, **`4`** instances of card 3, **`8`** instances of card 4, **`14`** instances of card 5, and **`1`** instance of card 6. In total, this example pile of scratchcards causes you to ultimately have **`30`** scratchcards! + +Process all of the original and copied scratchcards until no more scratchcards are won. Including the original set of scratchcards, **how many total scratchcards do you end up with**? + +Your puzzle answer was `5659035`. + +**Both parts of this puzzle are complete! They provide two gold stars: `**`.** diff --git a/day_4/input.txt b/day_4/input.txt new file mode 100644 index 0000000..da97dbb --- /dev/null +++ b/day_4/input.txt @@ -0,0 +1,208 @@ +Card 1: 57 76 72 11 8 28 15 38 54 46 | 77 87 71 98 40 7 84 43 61 64 5 50 19 83 79 99 36 47 4 95 30 44 37 55 26 +Card 2: 44 69 14 83 54 48 21 6 20 26 | 80 26 86 3 9 4 62 34 15 87 60 88 90 29 65 46 92 73 24 12 40 10 99 37 74 +Card 3: 15 60 63 84 20 93 36 39 17 19 | 68 80 17 91 20 84 69 72 15 39 5 61 74 99 60 85 19 45 24 79 53 36 7 63 93 +Card 4: 22 74 83 58 88 46 7 52 84 5 | 75 20 95 8 37 56 31 42 73 43 40 48 4 28 99 45 90 63 81 93 68 50 46 30 7 +Card 5: 4 97 41 50 32 26 68 84 5 11 | 91 70 87 4 88 13 48 51 32 34 38 82 86 11 1 50 40 43 28 5 61 89 84 41 37 +Card 6: 79 97 39 26 57 69 38 87 60 44 | 22 92 80 38 27 66 54 2 9 62 3 4 71 99 24 97 14 7 93 28 53 50 77 68 73 +Card 7: 73 91 51 23 90 67 19 81 50 12 | 4 76 97 64 19 85 31 3 74 12 23 60 20 68 52 39 43 65 37 63 40 59 99 80 6 +Card 8: 23 64 38 82 68 79 49 56 5 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b/day_4/input_example_1.txt new file mode 100644 index 0000000..9bdb874 --- /dev/null +++ b/day_4/input_example_1.txt @@ -0,0 +1,6 @@ +Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53 +Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19 +Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1 +Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83 +Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36 +Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11 diff --git a/day_4/src/lib.rs b/day_4/src/lib.rs new file mode 100644 index 0000000..f88cde0 --- /dev/null +++ b/day_4/src/lib.rs @@ -0,0 +1,163 @@ +use std::cmp; +use std::str::FromStr; + +#[derive(Debug, Default, PartialEq, Clone)] +pub struct CardNumbers { + pub numbers: Vec, +} + +impl FromStr for CardNumbers { + type Err = &'static str; + + /// Parses a string `string` to return a value of [`CardNumbers`] + /// + /// If parsing succeeds, return the value inside [`Ok`], otherwise + /// when the string is ill-formatted return an error specific to the + /// inside [`Err`]. + /// + /// # Examples + /// + /// ``` + /// use std::str::FromStr; + /// use day_4::CardNumbers; + /// + /// let string = "83 86 6 31 17 9 48 53"; + /// let expected_result = CardNumbers { + /// numbers: vec![83, 86, 6, 31, 17, 9, 48, 53], + /// }; + /// let actual_result = CardNumbers::from_str(string).unwrap(); + /// + /// assert_eq!(actual_result, expected_result); + /// ``` + fn from_str(string: &str) -> Result { + let result = CardNumbers { + numbers: string + .split_whitespace() + .map(|string| string.trim()) + .filter(|&string| !string.is_empty()) + .map(|string| string.parse::().unwrap_or_default()) + .collect(), + }; + Ok(result) + } +} + +#[derive(Debug, Default, PartialEq, Clone)] +pub struct Card { + pub id: usize, + pub winning_numbers_count: usize, +} + +impl FromStr for Card { + type Err = &'static str; + + /// Parses a string `string` to return a value of [`Card`] + /// + /// If parsing succeeds, return the value inside [`Ok`], otherwise + /// when the string is ill-formatted return an error specific to the + /// inside [`Err`]. + /// + /// # Examples + /// + /// ``` + /// use std::str::FromStr; + /// use day_4::{Card, CardNumbers}; + /// + /// let string = "Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53"; + /// let expected_result = Card { + /// id: 1, + /// winning_numbers_count: 4, + /// }; + /// let actual_result = Card::from_str(string).unwrap(); + /// + /// assert_eq!(actual_result, expected_result); + /// ``` + fn from_str(string: &str) -> Result { + let mut result = Card::default(); + let mut parts = string.split(": "); + result.id = parts + .next() + .unwrap_or("Card 1") + .strip_prefix("Card ") + .unwrap_or("1") + .trim() + .parse() + .unwrap_or(1); + + let mut numbers_parts = parts.next().unwrap_or("").split(" | "); + + let winning_numbers = + CardNumbers::from_str(numbers_parts.next().unwrap_or("")).unwrap_or_default(); + let owned_numbers = + CardNumbers::from_str(numbers_parts.next().unwrap_or("")).unwrap_or_default(); + + result.winning_numbers_count = owned_numbers + .numbers + .iter() + .filter(|&owned_number| winning_numbers.numbers.contains(owned_number)) + .count(); + + Ok(result) + } +} + +pub fn part_1(input: &str) -> usize { + input + .lines() + .map(|line| Card::from_str(line).unwrap_or_default()) + .map(|card| { + let winning_numbers_count = card.winning_numbers_count as u32; + let base: usize = 2; + if winning_numbers_count > 0 { + base.pow(winning_numbers_count.saturating_sub(1)) + } else { + 0 + } + }) + .sum::() +} + +pub fn part_2(input: &str) -> usize { + let cards = input + .lines() + .map(|line| Card::from_str(line).unwrap_or_default()) + .collect::>(); + let mut cards_identifiers = cards.iter().map(|card| card.id).collect::>(); + + let mut index_card = 0; + loop { + if index_card >= cards_identifiers.len() { + break; + } + + if let Some(card) = cards.get(cards_identifiers.get(index_card).unwrap_or(&0) - 1) { + let card_position_index = card.id - 1; + let maximum_index = cmp::min( + card_position_index + card.winning_numbers_count, + cards.len() - 1, + ); + for index in card_position_index + 1..=maximum_index { + cards_identifiers.push(index + 1); + } + } + + index_card += 1; + } + + cards_identifiers.len() +} + +#[cfg(test)] +mod day_4_tests { + use super::*; + + #[test] + fn test_part_1_example() { + assert_eq!(part_1(include_str!("../input_example_1.txt")), 13); + } + + #[test] + fn test_part_2_example() { + assert_eq!(part_2(include_str!("../input_example_1.txt")), 30); + } +} diff --git a/day_4/src/main.rs b/day_4/src/main.rs new file mode 100644 index 0000000..9a71dc5 --- /dev/null +++ b/day_4/src/main.rs @@ -0,0 +1,8 @@ +use day_4::{part_1, part_2}; + +fn main() { + let input = include_str!("../input.txt"); + println!("- Day 4: Scratchcards -"); + println!("Answer Part 1: {}", part_1(input)); + println!("Answer Part 2: {}", part_2(input)); +}