add initial data

aoc10/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc10"
+version = "0.1.0"

aoc10/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "aoc10"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

aoc10/example.txt

@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]

aoc10/input1.txt

@@ -0,0 +1,90 @@
+({{[<{[{[[<([[<><>][{}()]]<([]{})[<>()]>)><<<([]())>>{([()<>][{}{}])<[<>()]{()()}>}>]<(<[[[]<>]({}{})]{{{}<>}
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aoc10/src/main.rs

@@ -0,0 +1,146 @@
+use core::panic;
+use std::fs;
+
+const CLOSING: [char; 4] = [')', ']', '}', '>'];
+
+type Result = u64;
+
+struct Line<'a> {
+    input: &'a str,
+    illegal_char: Option<char>,
+    opened: Vec<char>,
+    value: Result,
+    is_incomplete: Option<bool>,
+}
+
+impl<'a> Line<'a> {
+    fn new(input: &'a str) -> Self {
+        Self {
+            input,
+            illegal_char: None,
+            opened: vec![],
+            value: 0,
+            is_incomplete: None,
+        }
+    }
+
+    pub fn run(&mut self) {
+        self.illegal_char = self.find_illegal_character();
+        self.value += match self.illegal_char {
+            Some(c) => get_value_for_illegal_character(c),
+            None => 0,
+        };
+        if self.is_incomplete == Some(true) {
+            self.value = self.evaluate_opened_chars();
+        }
+    }
+
+    fn evaluate_opened_chars(&mut self) -> Result {
+        let mut value = 0;
+        self.opened.reverse();
+        for character in &self.opened {
+            value *= 5;
+            value += get_value_for_unclosed_delimiter(character);
+        }
+
+        for c in &self.opened {
+            print!("{c}");
+        }
+        println!(" {value}");
+        value
+    }
+
+    fn find_illegal_character(&mut self) -> Option<char> {
+        let mut chars = self.input.chars();
+        self.opened.push(chars.next().unwrap());
+
+        for character in chars {
+            if CLOSING.contains(&character) {
+                if self.opened.last().unwrap() == &get_matching_delimiter(&character) {
+                    self.opened.pop();
+                } else {
+                    self.is_incomplete = Some(false);
+                    return Some(character);
+                }
+            } else {
+                self.opened.push(character);
+            }
+        }
+        self.is_incomplete = Some(true);
+        None
+    }
+}
+
+fn main() {
+    let file = fs::read_to_string("input1.txt").unwrap();
+
+    let mut instances = vec![];
+    for line in file.split_whitespace() {
+        let mut instance = Line::new(line);
+        instance.run();
+
+        instances.push(instance);
+    }
+    let result1 = instances
+        .iter()
+        .filter(|item| !item.is_incomplete.unwrap())
+        .map(|item| item.value)
+        .reduce(|accum, item| accum + item)
+        .unwrap();
+
+    println!("\n{result1}");
+
+    let mut result2: Vec<_> = instances
+        .iter()
+        .filter(|item| item.is_incomplete.unwrap())
+        .map(|item| item.value)
+        .collect();
+
+    result2.sort_unstable();
+    let index = (result2.len() - 1) / 2;
+    println!("{}", result2.get(index).unwrap());
+}
+
+fn get_matching_delimiter(input: &char) -> char {
+    if input == &')' {
+        '('
+    } else if input == &'(' {
+        ')'
+    } else if input == &']' {
+        '['
+    } else if input == &'[' {
+        ']'
+    } else if input == &'{' {
+        '}'
+    } else if input == &'}' {
+        '{'
+    } else if input == &'<' {
+        '>'
+    } else if input == &'>' {
+        '<'
+    } else {
+        panic!()
+    }
+}
+
+fn get_value_for_illegal_character(character: char) -> Result {
+    if character == ')' {
+        3
+    } else if character == ']' {
+        57
+    } else if character == '}' {
+        1197
+    } else {
+        25137
+    }
+}
+
+fn get_value_for_unclosed_delimiter(character: &char) -> Result {
+    match character {
+        '(' => 1,
+        '[' => 2,
+        '{' => 3,
+        '<' => 4,
+        _ => panic!(),
+    }
+}