AOC23
authorJustin Worthe <justin.worthe@gmail.com>
Fri, 23 Dec 2016 07:20:15 +0000 (09:20 +0200)
committerJustin Worthe <justin.worthe@gmail.com>
Fri, 23 Dec 2016 07:20:15 +0000 (09:20 +0200)
aoc23/Cargo.lock [new file with mode: 0644]
aoc23/Cargo.toml [new file with mode: 0644]
aoc23/input.txt [new file with mode: 0644]
aoc23/src/main.rs [new file with mode: 0644]

diff --git a/aoc23/Cargo.lock b/aoc23/Cargo.lock
new file mode 100644 (file)
index 0000000..c6ab041
--- /dev/null
@@ -0,0 +1,98 @@
+[root]
+name = "aoc23"
+version = "0.1.0"
+dependencies = [
+ "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "kernel32-sys"
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+]
+
+[[package]]
+name = "libc"
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+dependencies = [
+ "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.1.80"
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+dependencies = [
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+ "libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+]
+
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+
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diff --git a/aoc23/Cargo.toml b/aoc23/Cargo.toml
new file mode 100644 (file)
index 0000000..39fd06e
--- /dev/null
@@ -0,0 +1,7 @@
+[package]
+name = "aoc23"
+version = "0.1.0"
+authors = ["Justin Worthe <justin.worthe@entelect.co.za>"]
+
+[dependencies]
+regex = "0.1"
\ No newline at end of file
diff --git a/aoc23/input.txt b/aoc23/input.txt
new file mode 100644 (file)
index 0000000..3ff0460
--- /dev/null
@@ -0,0 +1,26 @@
+cpy a b
+dec b
+cpy a d
+cpy 0 a
+cpy b c
+inc a
+dec c
+jnz c -2
+dec d
+jnz d -5
+dec b
+cpy b c
+cpy c d
+dec d
+inc c
+jnz d -2
+tgl c
+cpy -16 c
+jnz 1 c
+cpy 90 c
+jnz 90 d
+inc a
+inc d
+jnz d -2
+inc c
+jnz c -5
diff --git a/aoc23/src/main.rs b/aoc23/src/main.rs
new file mode 100644 (file)
index 0000000..a12fa18
--- /dev/null
@@ -0,0 +1,247 @@
+extern crate regex;
+use regex::Regex;
+
+use std::io::BufReader;
+use std::io::prelude::*;
+use std::fs::File;
+
+enum Instruction {
+    Inc(usize),
+    Dec(usize),
+
+    TglLit(i32),
+    TglReg(usize),
+    
+    CpyLitReg(i32, usize),
+    CpyRegReg(usize, usize),
+    CpyLitLit(i32, i32),
+    CpyRegLit(usize, i32),
+    
+    JnzLitLit(i32, i32),
+    JnzRegLit(usize, i32),
+    JnzLitReg(i32, usize),
+    JnzRegReg(usize, usize),
+
+    Noop
+}
+
+impl Instruction {
+    fn parse(line: &str) -> Instruction {
+        match Regex::new(r"inc (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let reg = to_register_index(cap.at(1).unwrap());
+                return Instruction::Inc(reg);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"dec (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let reg = to_register_index(cap.at(1).unwrap());
+                return Instruction::Dec(reg);
+            },
+            _ => {}
+        }
+        
+
+        match Regex::new(r"tgl (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let reg = to_register_index(cap.at(1).unwrap());
+                return Instruction::TglReg(reg);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"tgl ([-\d]+)").unwrap().captures(line) {
+            Some(cap) => {
+                let lit = cap.at(1).unwrap().parse().unwrap();
+                return Instruction::TglLit(lit);
+            },
+            _ => {}
+        }
+        
+        
+        match Regex::new(r"cpy ([-\d]+) (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = cap.at(1).unwrap().parse().unwrap();
+                let dest = to_register_index(cap.at(2).unwrap());
+                return Instruction::CpyLitReg(src, dest);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"cpy (a|b|c|d) (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = to_register_index(cap.at(1).unwrap());
+                let dest = to_register_index(cap.at(2).unwrap());
+                return Instruction::CpyRegReg(src, dest);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"cpy ([-\d]+) ([-\d]+)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = cap.at(1).unwrap().parse().unwrap();
+                let dest = cap.at(2).unwrap().parse().unwrap();
+                return Instruction::CpyLitLit(src, dest);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"cpy (a|b|c|d) ([-\d]+)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = to_register_index(cap.at(1).unwrap());
+                let dest = cap.at(2).unwrap().parse().unwrap();
+                return Instruction::CpyRegReg(src, dest);
+            },
+            _ => {}
+        }
+
+        
+        match Regex::new(r"jnz ([-\d]+) (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = cap.at(1).unwrap().parse().unwrap();
+                let dest = to_register_index(cap.at(2).unwrap());
+                return Instruction::JnzLitReg(src, dest);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"jnz (a|b|c|d) (a|b|c|d)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = to_register_index(cap.at(1).unwrap());
+                let dest = to_register_index(cap.at(2).unwrap());
+                return Instruction::JnzRegReg(src, dest);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"jnz ([-\d]+) ([-\d]+)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = cap.at(1).unwrap().parse().unwrap();
+                let dest = cap.at(2).unwrap().parse().unwrap();
+                return Instruction::JnzLitLit(src, dest);
+            },
+            _ => {}
+        }
+
+        match Regex::new(r"jnz (a|b|c|d) ([-\d]+)").unwrap().captures(line) {
+            Some(cap) => {
+                let src = to_register_index(cap.at(1).unwrap());
+                let dest = cap.at(2).unwrap().parse().unwrap();
+                return Instruction::JnzRegLit(src, dest);
+            },
+            _ => {}
+        }
+        
+        panic!("Invalid instruction line");
+    }
+
+    fn toggle(&self) -> Self {
+        match *self {
+            Instruction::Inc(a) => Instruction::Dec(a),
+            Instruction::Dec(a) => Instruction::Inc(a),
+            
+            Instruction::TglLit(_) => Instruction::Noop,
+            Instruction::TglReg(a) => Instruction::Inc(a),
+            
+            Instruction::CpyLitReg(a, b) => Instruction::JnzLitReg(a, b),
+            Instruction::CpyRegReg(a, b) => Instruction::JnzRegReg(a, b),
+            Instruction::CpyLitLit(a, b) => Instruction::JnzLitLit(a, b),
+            Instruction::CpyRegLit(a, b) => Instruction::JnzRegLit(a, b),
+            
+            Instruction::JnzLitLit(a, b) => Instruction::CpyLitLit(a, b),
+            Instruction::JnzRegLit(a, b) => Instruction::CpyRegLit(a, b),
+            Instruction::JnzLitReg(a, b) => Instruction::CpyLitReg(a, b),
+            Instruction::JnzRegReg(a, b) => Instruction::CpyRegReg(a, b),
+            Instruction::Noop => Instruction::Noop
+        }
+    }
+}
+
+fn main() {
+    let mut program = read_file();
+
+    let mut registers: [i32; 4] = [12, 0, 0, 0];
+    let mut pc: usize = 0;
+    
+    while pc < program.len() {
+        let mut pc_next: usize = pc+1;
+
+        match program[pc] {
+            Instruction::Inc(dest) => {
+                registers[dest] += 1;
+            },
+            Instruction::Dec(dest) => {
+                registers[dest] -= 1;
+            },
+            
+            Instruction::TglReg(offset) => {
+                let line_to_toggle = (pc as i32 + registers[offset]) as usize;
+                if line_to_toggle > 0 && line_to_toggle < program.len() {
+                    program[line_to_toggle] = program[line_to_toggle].toggle();
+                }
+            },
+            Instruction::TglLit(offset) => {
+                let line_to_toggle = (pc as i32 + offset) as usize;
+                if line_to_toggle > 0 && line_to_toggle < program.len() {
+                    program[line_to_toggle] = program[line_to_toggle].toggle();
+                }
+            },
+            
+            Instruction::CpyLitReg(src, dest) => {
+                registers[dest] = src;
+            },
+            Instruction::CpyRegReg(src, dest) => {
+                registers[dest] = registers[src];
+            },
+            Instruction::CpyLitLit(_, _) | Instruction::CpyRegLit(_, _) => {},
+            
+            Instruction::JnzRegLit(condition, offset) => {
+                if registers[condition] != 0 {
+                    pc_next = (pc as i32 + offset) as usize;
+                }
+            },
+            Instruction::JnzLitLit(condition, offset) => {
+                if condition != 0 {
+                    pc_next = (pc as i32 + offset) as usize;
+                }
+            },
+            Instruction::JnzRegReg(condition, offset) => {
+                if registers[condition] != 0 {
+                    pc_next = (pc as i32 + registers[offset]) as usize;
+                }
+            },
+            Instruction::JnzLitReg(condition, offset) => {
+                if condition != 0 {
+                    pc_next = (pc as i32 + registers[offset]) as usize;
+                }
+            },
+            Instruction::Noop => {}
+        }
+
+        pc = pc_next;
+    }
+    
+    println!("a: {}, b: {}, c: {}, d: {}", registers[0], registers[1], registers[2], registers[3]);
+    
+}
+
+fn to_register_index(name: &str) -> usize {
+    match name {
+        "a" => 0,
+        "b" => 1,
+        "c" => 2,
+        "d" => 3,
+        _ => panic!("Invalid register provided")
+    }
+}
+
+fn read_file() -> Vec<Instruction> {
+    let file = BufReader::new(File::open("input.txt").unwrap());
+    file.lines()
+        .map(|line| line.unwrap())
+        .filter(|line| line.len() > 0)
+        .map(|line| Instruction::parse(line.trim()))
+        .collect()
+}