Add 2022

author: Santo Cariotti <santo@dcariotti.me> 2022-12-05 19:46:06 +0100
committer: Santo Cariotti <santo@dcariotti.me> 2022-12-05 19:46:06 +0100
commit: cf6303a5bc1558ebdb7b467da38f74cd3ac3a9b1 (patch)
tree: 6292cb239a8cf114179c6e7c8b3015840dfbae6e /2021
parent: 6e10cc2773fcaff64902b13f44443da014f38be7 (diff)
27 files changed, 5438 insertions, 0 deletions
diff --git a/2021/Cargo.toml b/2021/Cargo.toml
new file mode 100644
index 0000000..9f555f1
--- /dev/null
+++ b/2021/Cargo.toml
@@ -0,0 +1,2 @@
+[workspace]
+members = ["day1", "day2", "day3", "day4", "day6", "day7", "day9", "day10"]
diff --git a/2021/day1/Cargo.toml b/2021/day1/Cargo.toml
new file mode 100644
index 0000000..a3c4e52
--- /dev/null
+++ b/2021/day1/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day1/input.txt b/2021/day1/input.txt
new file mode 100644
index 0000000..ad1abff
--- /dev/null
+++ b/2021/day1/input.txt
@@ -0,0 +1,2000 @@
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diff --git a/2021/day1/src/main.rs b/2021/day1/src/main.rs
new file mode 100644
index 0000000..7e18b94
--- /dev/null
+++ b/2021/day1/src/main.rs
@@ -0,0 +1,21 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+
+fn main() {
+    let file = File::open("input.txt").expect("File not found");
+    let reader = BufReader::new(file);
+    let values: Vec<i32> = reader
+        .lines()
+        .map(|x| x.unwrap().parse::<i32>().unwrap())
+        .collect::<Vec<i32>>();
+    let mut increasing: u16 = 0;
+
+    for index in 1..values.len() {
+        if values[index - 1] < values[index] {
+            increasing += 1;
+        }
+    }
+
+    println!("{}", increasing);
+}
diff --git a/2021/day10/Cargo.toml b/2021/day10/Cargo.toml
new file mode 100644
index 0000000..40d2066
--- /dev/null
+++ b/2021/day10/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day10"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day10/example.txt b/2021/day10/example.txt
new file mode 100644
index 0000000..b1518d9
--- /dev/null
+++ b/2021/day10/example.txt
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
diff --git a/2021/day10/input.txt b/2021/day10/input.txt
new file mode 100644
index 0000000..df5a5a3
--- /dev/null
+++ b/2021/day10/input.txt
@@ -0,0 +1,110 @@
+{[[<{(<{[{{[{[[]{}]{<>{}}}({<>()}{{}{}})]}{({[<>{}]({}[])})[{[{}[]](()<>)}<[{}{}]{()<>}>]}}]<(({{{(){}}{[][]
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+{<[(([{{{[(<<[{}()]>{(<>())[[]{}]}>){{[{{}[]}{()<>}]{(()<>)<<><>>}}}]}{(<[([[]][{}[]])]>)[[((<{}[]})[
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diff --git a/2021/day10/src/lib.rs b/2021/day10/src/lib.rs
new file mode 100644
index 0000000..6cf54ad
--- /dev/null
+++ b/2021/day10/src/lib.rs
@@ -0,0 +1,191 @@
+use std::collections::VecDeque;
+use std::str::FromStr;
+
+pub struct SyntaxLines {
+    lines: Vec<String>,
+}
+
+impl FromStr for SyntaxLines {
+    type Err = ();
+
+    fn from_str(input: &str) -> Result<Self, Self::Err> {
+        let lines: Vec<_> = input
+            .trim()
+            .split('\n')
+            .map(|x| x.to_owned())
+            .collect::<Vec<String>>();
+
+        Ok(SyntaxLines { lines })
+    }
+}
+
+impl SyntaxLines {
+    pub fn part1(&self) -> u32 {
+        let mut result: u32 = 0;
+
+        for line in &self.lines {
+            let mut qopen = VecDeque::new();
+            let mut panic_char = ' ';
+
+            for character in line.chars() {
+                match character {
+                    c if character == '('
+                        || character == '['
+                        || character == '{'
+                        || character == '<' =>
+                    {
+                        qopen.push_back(c);
+                    }
+                    c if character == ')'
+                        || character == ']'
+                        || character == '}'
+                        || character == '>' =>
+                    {
+                        match qopen.pop_back() {
+                            Some(bracket) => {
+                                let mut error = false;
+                                if c == ')' && bracket != '(' {
+                                    error = true;
+                                } else if c == ']' && bracket != '[' {
+                                    error = true;
+                                } else if c == '}' && bracket != '{' {
+                                    error = true;
+                                } else if c == '>' && bracket != '<' {
+                                    error = true;
+                                }
+
+                                if error {
+                                    panic_char = c;
+                                }
+                            }
+                            None => panic!("Wtf?"),
+                        };
+                    }
+                    _ => {}
+                };
+
+                if panic_char != ' ' {
+                    if panic_char == ')' {
+                        result += 3;
+                    } else if panic_char == ']' {
+                        result += 57;
+                    } else if panic_char == '}' {
+                        result += 1197;
+                    } else if panic_char == '>' {
+                        result += 25137;
+                    }
+                    break;
+                }
+            }
+        }
+
+        result
+    }
+
+    pub fn part2(&self) -> u64 {
+        let mut scores = Vec::<u64>::new();
+
+        for line in &self.lines {
+            let mut qopen = VecDeque::new();
+            let mut panic_char = ' ';
+            let mut result: u64 = 0;
+
+            for character in line.chars() {
+                match character {
+                    c if character == '('
+                        || character == '['
+                        || character == '{'
+                        || character == '<' =>
+                    {
+                        qopen.push_back(c);
+                    }
+                    c if character == ')'
+                        || character == ']'
+                        || character == '}'
+                        || character == '>' =>
+                    {
+                        match qopen.pop_back() {
+                            Some(bracket) => {
+                                let mut error = false;
+                                if c == ')' && bracket != '(' {
+                                    error = true;
+                                } else if c == ']' && bracket != '[' {
+                                    error = true;
+                                } else if c == '}' && bracket != '{' {
+                                    error = true;
+                                } else if c == '>' && bracket != '<' {
+                                    error = true;
+                                }
+
+                                if error {
+                                    panic_char = c;
+                                }
+                            }
+                            None => panic!("Wtf?"),
+                        };
+                    }
+                    _ => {}
+                };
+
+                if panic_char != ' ' {
+                    break;
+                }
+            }
+
+            if panic_char == ' ' {
+                while !qopen.is_empty() {
+                    let v = qopen.pop_back().unwrap();
+                    result *= 5;
+                    result += if v == '(' {
+                        1
+                    } else if v == '[' {
+                        2
+                    } else if v == '{' {
+                        3
+                    } else {
+                        4
+                    };
+                }
+                scores.push(result);
+            }
+        }
+
+        let middle = scores.len() / 2 as usize;
+        scores.sort();
+
+        scores[middle]
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_example() {
+        let input: SyntaxLines = include_str!("../example.txt").parse().unwrap();
+        let result = input.part1();
+        assert_eq!(result, 26397);
+    }
+
+    #[test]
+    fn test_example_part2() {
+        let input: SyntaxLines = include_str!("../example.txt").parse().unwrap();
+        let result = input.part2();
+        assert_eq!(result, 288957);
+    }
+
+    #[test]
+    fn test_puzzle_input() {
+        let input: SyntaxLines = include_str!("../input.txt").parse().unwrap();
+        let result = input.part1();
+        assert_eq!(result, 392367);
+    }
+
+    #[test]
+    fn test_puzzle_input_part2() {
+        let input: SyntaxLines = include_str!("../input.txt").parse().unwrap();
+        let result = input.part2();
+        assert_eq!(result, 2192104158);
+    }
+}
diff --git a/2021/day2/Cargo.toml b/2021/day2/Cargo.toml
new file mode 100644
index 0000000..8aa34bb
--- /dev/null
+++ b/2021/day2/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day2"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day2/input.txt b/2021/day2/input.txt
new file mode 100644
index 0000000..9e714f9
--- /dev/null
+++ b/2021/day2/input.txt
@@ -0,0 +1,1000 @@
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+down 4
+forward 3
+up 6
+down 3
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+down 7
+up 1
+forward 3
+forward 2
diff --git a/2021/day2/src/main.rs b/2021/day2/src/main.rs
new file mode 100644
index 0000000..e0153a3
--- /dev/null
+++ b/2021/day2/src/main.rs
@@ -0,0 +1,34 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+
+fn main() {
+    let file = File::open("input.txt").unwrap();
+    let reader = BufReader::new(&file);
+    let tokens: Vec<String> = reader.lines().map(|x| x.unwrap()).collect::<Vec<String>>();
+    let mut xpos: u32 = 0;
+    let mut ypos: u32 = 0;
+    let mut aim: u32 = 0;
+
+    for line in tokens {
+        let command: Vec<&str> = line.split(" ").collect();
+        let (action, value) = (command[0], command[1].parse::<u32>().unwrap());
+
+        match action {
+            "forward" => {
+                xpos += value;
+                ypos += aim * value;
+            }
+            "down" => {
+                // ypos += value;
+                aim += value;
+            }
+            "up" => {
+                // ypos -= value;
+                aim -= value;
+            }
+            _ => {}
+        }
+    }
+    println!("{}", ypos * xpos);
+}
diff --git a/2021/day3/Cargo.toml b/2021/day3/Cargo.toml
new file mode 100644
index 0000000..898e70d
--- /dev/null
+++ b/2021/day3/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day3"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day3/input.txt b/2021/day3/input.txt
new file mode 100644
index 0000000..b380427
--- /dev/null
+++ b/2021/day3/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2021/day3/src/main.rs b/2021/day3/src/main.rs
new file mode 100644
index 0000000..10c1f81
--- /dev/null
+++ b/2021/day3/src/main.rs
@@ -0,0 +1,36 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+
+fn main() -> Result<(), std::io::Error> {
+    let file = File::open("input.txt")?;
+    let reader = BufReader::new(&file);
+
+    let lines: Vec<_> = reader.lines().map(|x| x.unwrap()).collect::<Vec<String>>();
+    let mut bits: Vec<u32> = vec![0; lines[0].len()];
+    let half: u32 = (lines.len() / 2) as u32;
+    let mut gamma_string = String::new();
+    let mut epsilon_string = String::new();
+
+    for line in lines {
+        for (index, character) in line.chars().enumerate() {
+            bits[index] += character.to_digit(10).unwrap();
+        }
+    }
+
+    for bit in bits {
+        if bit >= half {
+            gamma_string.push('1');
+            epsilon_string.push('0');
+        } else {
+            gamma_string.push('0');
+            epsilon_string.push('1');
+        }
+    }
+    let gamma_rate = isize::from_str_radix(&gamma_string, 2).unwrap();
+    let epsilon_rate = isize::from_str_radix(&epsilon_string, 2).unwrap();
+
+    println!("{}", gamma_rate * epsilon_rate);
+
+    Ok(())
+}
diff --git a/2021/day4/Cargo.toml b/2021/day4/Cargo.toml
new file mode 100644
index 0000000..8842130
--- /dev/null
+++ b/2021/day4/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day4"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day4/input.txt b/2021/day4/input.txt
new file mode 100644
index 0000000..4c28ac7
--- /dev/null
+++ b/2021/day4/input.txt
@@ -0,0 +1,601 @@
+76,69,38,62,33,48,81,2,64,21,80,90,29,99,37,15,93,46,75,0,89,56,58,40,92,47,8,6,54,96,12,66,83,4,70,19,17,5,50,52,45,51,18,27,49,71,28,86,74,77,11,20,84,72,23,31,16,78,91,65,87,79,73,94,24,68,63,9,88,82,30,42,60,13,67,85,44,59,7,53,22,1,26,41,61,55,43,39,3,35,25,34,57,10,14,32,97,95,36,98
+
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+
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+
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+
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+
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diff --git a/2021/day4/src/main.rs b/2021/day4/src/main.rs
new file mode 100644
index 0000000..4b2f9b3
--- /dev/null
+++ b/2021/day4/src/main.rs
@@ -0,0 +1,107 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+fn part1(grids: &Vec<Vec<u32>>, mut inputs: Vec<u32>) -> u32 {
+    let mut values = Vec::<u32>::new();
+
+    for _ in 0..4 {
+        values.push(inputs.remove(0));
+    }
+
+    let mut winner: i8 = -1;
+    for input in inputs {
+        if winner >= 0 {
+            break;
+        }
+        values.push(input);
+        for i in 0..grids.len() {
+            // Search by rows
+            for j in [0, 5, 10, 15, 20] {
+                let mut n = 0;
+                for k in 0..5 {
+                    let x = grids[i][j + k];
+                    if values.iter().any(|&i| i == x) {
+                        n += 1;
+                    }
+                }
+                if n == 5 {
+                    winner = i as i8;
+                }
+            }
+
+            // Search by cols
+            if winner < 0 {
+                for j in 0..5 {
+                    let mut n = 0;
+                    for k in [0, 5, 10, 15, 20] {
+                        let x = grids[i][j + k];
+                        if values.iter().any(|&i| i == x) {
+                            n += 1;
+                        }
+                    }
+                    if n == 5 {
+                        winner = i as i8;
+                    }
+                }
+            }
+
+            if winner >= 0 {
+                break;
+            }
+        }
+    }
+
+    let mut sum = 0;
+    for x in &grids[winner as usize] {
+        if values.iter().any(|&i| i == *x) {
+            continue;
+        }
+
+        sum += x;
+    }
+
+    sum * values.pop().unwrap()
+}
+
+fn main() -> std::io::Result<()> {
+    let file = File::open("input.txt")?;
+    let reader = BufReader::new(file);
+    let mut lines = reader.lines();
+
+    let inputs: Vec<_> = lines
+        .next()
+        .unwrap()
+        .unwrap()
+        .trim()
+        .split(',')
+        .map(|x| x.parse::<u32>().unwrap())
+        .collect::<Vec<u32>>();
+
+    let mut grids: Vec<Vec<u32>> = vec![];
+    let mut n: usize = 0;
+
+    lines.next(); // Ignore the first empty line
+    while let Some(line) = lines.next() {
+        let mut line = line.unwrap();
+        grids.push(Vec::with_capacity(5 * 5));
+
+        for _ in 0..5 {
+            grids[n].extend(
+                line.trim()
+                    .split(' ')
+                    .filter(|x| !x.is_empty())
+                    .map(|x| x.parse::<u32>().unwrap())
+                    .collect::<Vec<u32>>(),
+            );
+            line = match lines.next() {
+                Some(x) => x.unwrap(),
+                None => "".to_string(),
+            };
+        }
+        n += 1;
+    }
+
+    println!("{}", part1(&grids, inputs.clone()));
+
+    Ok(())
+}
diff --git a/2021/day6/Cargo.toml b/2021/day6/Cargo.toml
new file mode 100644
index 0000000..89d04ae
--- /dev/null
+++ b/2021/day6/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day6"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day6/input.txt b/2021/day6/input.txt
new file mode 100644
index 0000000..de918c7
--- /dev/null
+++ b/2021/day6/input.txt
@@ -0,0 +1 @@
+1,1,3,5,1,1,1,4,1,5,1,1,1,1,1,1,1,3,1,1,1,1,2,5,1,1,1,1,1,2,1,4,1,4,1,1,1,1,1,3,1,1,5,1,1,1,4,1,1,1,4,1,1,3,5,1,1,1,1,4,1,5,4,1,1,2,3,2,1,1,1,1,1,1,1,1,1,1,1,1,1,5,1,1,1,1,1,1,1,1,2,2,1,1,1,1,1,5,1,1,1,3,4,1,1,1,1,3,1,1,1,1,1,4,1,1,3,1,1,3,1,1,1,1,1,3,1,5,2,3,1,2,3,1,1,2,1,2,4,5,1,5,1,4,1,1,1,1,2,1,5,1,1,1,1,1,5,1,1,3,1,1,1,1,1,1,4,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,2,1,1,1,1,2,2,1,2,1,1,1,5,5,1,1,1,1,1,1,1,1,1,1,1,1,2,2,1,1,4,2,1,4,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,1,5,1,1,1,1,1,1,1,1,3,1,1,3,3,1,1,1,3,5,1,1,4,1,1,1,1,1,4,1,1,3,1,1,1,1,1,1,1,1,2,1,5,1,1,1,1,1,1,1,1,1,1,4,1,1,1,1
diff --git a/2021/day6/src/main.rs b/2021/day6/src/main.rs
new file mode 100644
index 0000000..46a148c
--- /dev/null
+++ b/2021/day6/src/main.rs
@@ -0,0 +1,36 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+fn main() -> std::io::Result<()> {
+    let file = File::open("input.txt")?;
+    let mut reader = BufReader::new(file);
+    let mut buffer = String::new();
+
+    reader.read_line(&mut buffer)?;
+
+    let mut lanternfishes: Vec<_> = buffer
+        .trim()
+        .split(',')
+        .map(|x| x.parse::<i16>().unwrap())
+        .collect::<Vec<i16>>();
+
+    for _ in 0..80 {
+        let mut n = 0;
+        for lanternfish in lanternfishes.iter_mut() {
+            if *lanternfish == 0 {
+                *lanternfish = 6;
+                n += 1;
+            } else {
+                *lanternfish -= 1;
+            }
+        }
+
+        for _ in 0..n {
+            lanternfishes.push(8);
+        }
+    }
+
+    println!("{}", lanternfishes.len());
+
+    Ok(())
+}
diff --git a/2021/day7/Cargo.toml b/2021/day7/Cargo.toml
new file mode 100644
index 0000000..b170ccb
--- /dev/null
+++ b/2021/day7/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day7"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day7/input.txt b/2021/day7/input.txt
new file mode 100644
index 0000000..3e0fecf
--- /dev/null
+++ b/2021/day7/input.txt
@@ -0,0 +1 @@
+1101,1,29,67,1102,0,1,65,1008,65,35,66,1005,66,28,1,67,65,20,4,0,1001,65,1,65,1106,0,8,99,35,67,101,99,105,32,110,39,101,115,116,32,112,97,115,32,117,110,101,32,105,110,116,99,111,100,101,32,112,114,111,103,114,97,109,10,62,461,1087,183,1096,431,412,200,486,1543,25,580,1030,15,65,1186,9,226,173,77,119,691,855,451,88,741,221,1465,190,779,327,179,627,366,288,174,1147,49,773,3,5,65,20,172,601,307,611,699,1168,933,1295,832,242,62,8,4,226,768,33,566,21,10,937,15,760,100,574,181,89,72,1054,225,28,0,685,661,131,281,933,90,233,109,1345,81,106,636,1262,193,172,1056,709,1176,447,536,1054,929,171,226,127,274,710,917,218,192,25,128,321,1816,515,181,759,20,258,134,281,151,99,479,623,534,72,576,534,337,54,293,450,230,963,14,357,446,1244,964,16,865,52,1,1171,77,7,275,313,894,577,305,1119,393,285,354,136,1147,241,441,166,1024,650,101,178,1514,186,902,367,5,431,374,56,507,857,1316,0,186,63,118,1062,62,446,266,47,354,168,65,1036,447,689,160,749,728,791,1066,99,675,194,891,153,737,801,254,905,1046,21,413,386,204,603,373,218,440,137,1340,1616,121,903,722,841,731,213,219,405,336,1345,144,329,285,213,272,717,47,126,1137,548,32,21,755,219,595,187,143,636,476,397,185,70,345,89,319,80,867,26,1166,509,24,16,151,605,1415,893,814,473,289,377,407,44,184,290,447,1669,116,319,455,294,145,513,58,247,186,1565,31,297,1,226,1051,1561,1233,254,1274,422,547,1638,354,1855,419,71,1003,626,519,109,96,996,117,32,226,424,184,181,720,1311,1162,11,86,438,408,1269,887,612,327,133,1117,1390,345,10,370,175,37,1154,659,707,193,665,65,359,758,1253,498,219,601,59,919,1371,289,9,437,392,626,981,2,51,733,780,101,541,770,464,28,616,81,1708,1515,719,780,1214,673,268,246,25,252,301,205,27,160,0,298,69,285,58,809,1369,812,628,353,47,632,123,168,135,277,303,614,365,330,1385,1117,1346,737,744,1403,385,215,437,276,726,673,668,494,164,1,763,696,487,252,375,1253,42,1111,963,58,63,11,1648,1080,964,526,454,1349,1098,95,59,78,36,42,654,1441,1129,464,740,355,370,44,4,154,986,439,828,287,969,765,565,836,196,387,556,34,586,438,1205,760,798,6,61,260,25,418,1628,566,3,530,753,758,16,92,30,1388,109,240,513,1048,1056,588,1634,418,297,195,447,1145,198,466,0,607,180,57,58,72,319,221,869,744,339,195,1295,268,1336,1310,38,714,326,393,445,422,102,389,188,147,21,805,381,520,561,282,438,115,431,156,482,50,890,470,22,60,46,1588,971,1219,82,380,1061,948,455,99,255,400,1832,91,225,280,520,279,91,172,92,946,434,182,164,142,83,91,281,538,962,77,1104,1522,310,4,961,62,9,1257,596,464,733,338,1166,334,380,509,773,90,498,480,1523,1632,530,543,413,589,748,4,861,11,233,192,699,33,615,1853,205,270,624,1132,1100,227,1402,349,183,179,645,4,1120,962,317,326,128,422,281,302,701,53,179,34,802,272,1254,375,764,418,16,160,943,479,416,717,644,1029,372,140,114,449,351,159,305,1299,749,488,502,180,210,17,533,258,120,333,1097,185,1911,451,360,66,1329,1260,209,1611,454,809,336,783,1438,20,26,609,720,155,578,367,231,1715,64,610,465,752,81,108,389,995,244,1291,1144,159,161,1630,561,813,261,67,1604,124,231,833,14,15,1245,1309,1165,103,1270,228,1,133,644,581,218,481,716,237,155,360,110,1408,931,99,216,5,21,67,348,927,325,759,1127,557,584,696,428,653,548,247,1519,1682,132,3,1648,230,229,136,253,543,1153,204,669,58,81,357,85,82,749,503,139,32,1170,1352,151,653,1441,51,392,474,2,114,64,418,125,514,838,473,794,331,13,327,1476,836,37,3,0,115,18,1784,300,190,99,997,1164,31,1255,96,64,1101,354,698,372,852,1508,100,289,32,704,292,504,191,1342,231,692,12,369,1182,62,809,566,688,218,2,539,234,996,444,228,456,369,115,23,29,226,940,95,404,349,1254,171,69,711,2,1405,1181,34,8,92,173,533,20,181,921,201,1236,185,457,526,2,106,12,601,58,339,457,590,15,1583,473,451,1124,1569,401,72,154,9,1331,471,165,516,463,543,298,197,43,1294,101,1058,1025,1099,4,634,90,104,870,480,412,290,11,924,338,30,281,83,268,20,848,1722,1060,987,9,196,266,28,402,267,199,814,986,440,906,796,1403,1394,62,136,442,412,1729,571,459,91,730,269,172,202,772,305
diff --git a/2021/day7/src/main.rs b/2021/day7/src/main.rs
new file mode 100644
index 0000000..26e1e30
--- /dev/null
+++ b/2021/day7/src/main.rs
@@ -0,0 +1,29 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+fn main() -> std::io::Result<()> {
+    let file = File::open("input.txt")?;
+    let mut reader = BufReader::new(file);
+    let mut buffer = String::new();
+    reader.read_line(&mut buffer)?;
+
+    let mut inputs: Vec<_> = buffer
+        .trim()
+        .split(',')
+        .map(|x| x.parse::<i16>().unwrap())
+        .collect::<Vec<i16>>();
+
+    inputs.sort();
+
+    let half: usize = inputs.len() / 2;
+    let middle = inputs[half];
+    let mut sum: u32 = 0;
+
+    for input in inputs {
+        sum += (input - middle).abs() as u32;
+    }
+
+    println!("{}", sum);
+
+    Ok(())
+}
diff --git a/2021/day9/Cargo.toml b/2021/day9/Cargo.toml
new file mode 100644
index 0000000..b5e5273
--- /dev/null
+++ b/2021/day9/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day9"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2021/day9/example.txt b/2021/day9/example.txt
new file mode 100644
index 0000000..6dee4a4
--- /dev/null
+++ b/2021/day9/example.txt
@@ -0,0 +1,5 @@
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678
diff --git a/2021/day9/input.txt b/2021/day9/input.txt
new file mode 100644
index 0000000..10120f9
--- /dev/null
+++ b/2021/day9/input.txt
@@ -0,0 +1,100 @@
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diff --git a/2021/day9/src/lib.rs b/2021/day9/src/lib.rs
new file mode 100644
index 0000000..3391a74
--- /dev/null
+++ b/2021/day9/src/lib.rs
@@ -0,0 +1,90 @@
+use std::str::FromStr;
+
+#[derive(Debug)]
+struct Heightmap {
+    data: Vec<Vec<u8>>,
+    rows: usize,
+    cols: usize,
+}
+
+impl FromStr for Heightmap {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let rows: Vec<_> = s.trim().split('\n').collect::<Vec<&str>>();
+        let mut data: Vec<Vec<u8>> = vec![];
+        for row in &rows {
+            data.push(
+                row.chars()
+                    .map(|x| x.to_digit(10).unwrap() as u8)
+                    .collect::<Vec<u8>>(),
+            );
+        }
+        Ok(Heightmap {
+            data,
+            rows: rows.len(),
+            cols: rows[0].chars().count(),
+        })
+    }
+}
+
+impl Heightmap {
+    fn resolve(&self) -> usize {
+        let mut count: usize = 0;
+
+        for i in 0..self.rows {
+            for j in 0..self.cols {
+                let top = if i > 0 { self.data[i - 1][j] } else { 10 };
+
+                let bottom = if i < self.rows - 1 {
+                    self.data[i + 1][j]
+                } else {
+                    10
+                };
+
+                let left = if j > 0 { self.data[i][j - 1] } else { 10 };
+
+                let right = if j < self.cols - 1 {
+                    self.data[i][j + 1]
+                } else {
+                    10
+                };
+                let center = self.data[i][j];
+
+                if center < top && center < bottom && center < left && center < right {
+                    count += (center + 1) as usize;
+                }
+            }
+        }
+
+        count
+    }
+}
+
+pub fn part1(input: &str) -> usize {
+    let grid: Heightmap = input.parse().unwrap();
+    let result = grid.resolve();
+
+    result
+}
+
+#[cfg(test)]
+mod day9_test {
+    use super::*;
+
+    #[test]
+    fn test_with_example_data() {
+        let data = include_str!("../example.txt");
+        let result = part1(data);
+
+        assert_eq!(result, 15);
+    }
+
+    #[test]
+    fn test_puzzle_input_part1() {
+        let data = include_str!("../input.txt");
+        let result = part1(data);
+
+        assert_eq!(result, 541);
+    }
+}
author	Santo Cariotti <santo@dcariotti.me>	2022-12-05 19:46:06 +0100
committer	Santo Cariotti <santo@dcariotti.me>	2022-12-05 19:46:06 +0100
commit	cf6303a5bc1558ebdb7b467da38f74cd3ac3a9b1 (patch)
tree	6292cb239a8cf114179c6e7c8b3015840dfbae6e /2021
parent	6e10cc2773fcaff64902b13f44443da014f38be7 (diff)