diff --git a/aoc_09a/.gitignore b/aoc_09a/.gitignore new file mode 100644 index 0000000..62bd1a4 --- /dev/null +++ b/aoc_09a/.gitignore @@ -0,0 +1,12 @@ +# ---> Rust +# Generated by Cargo +# will have compiled files and executables +/target/ + +# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries +# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html +Cargo.lock + +# These are backup files generated by rustfmt +**/*.rs.bk + diff --git a/aoc_09a/Cargo.toml b/aoc_09a/Cargo.toml new file mode 100644 index 0000000..d926ffa --- /dev/null +++ b/aoc_09a/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "aoc_09a" +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/aoc_09a/input b/aoc_09a/input new file mode 100644 index 0000000..8e32261 --- /dev/null +++ b/aoc_09a/input @@ -0,0 +1,2000 @@ +R 1 +U 2 +R 1 +L 2 +U 2 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8 +R 1 +D 3 +R 11 +U 12 +D 14 +L 1 +U 4 +D 2 +L 11 +R 4 +U 14 +R 1 +L 3 +R 13 +L 13 +D 8 +L 14 +U 12 +R 13 +D 9 +R 8 +D 12 +U 14 +D 2 +L 10 +R 1 +D 12 +R 13 +L 1 +U 5 +L 12 +R 6 +U 14 +R 6 +L 13 +U 11 +R 2 +D 6 +R 5 +U 12 +R 1 +D 11 +L 4 +U 6 +R 4 +U 5 +L 12 +D 3 +R 4 +D 1 +L 15 +R 15 +U 13 +R 10 +U 14 +R 15 +D 4 +R 8 +U 13 +L 4 +R 5 +D 7 +R 5 +L 2 +D 7 +L 4 +R 7 +D 6 +R 3 +D 12 +U 9 +L 14 +R 7 +L 12 +R 7 +D 15 +R 4 +L 1 +D 11 +R 10 +D 8 +L 9 +D 10 +L 4 +R 10 +U 8 +D 2 +L 8 +D 7 +U 11 +L 9 +U 15 +L 7 +R 6 +L 14 +D 2 +L 15 +D 6 +U 2 +R 9 +D 6 +U 7 +R 7 diff --git a/aoc_09a/src/main.rs b/aoc_09a/src/main.rs new file mode 100644 index 0000000..c263660 --- /dev/null +++ b/aoc_09a/src/main.rs @@ -0,0 +1,85 @@ +use std::fs::File; +use std::io::{self, BufRead}; +use std::path::Path; +use std::collections::HashMap; + +fn main() { + let file_path = String::from("input"); + let mut positions = HashMap::<(i32, i32), u32>::new(); + let mut tail: (i32, i32) = (0, 0); + let mut head: (i32, i32) = (0, 0); + *positions.entry(tail).or_insert(0) += 1; + + + println!("In file {}", file_path); + + if let Ok(lines) = read_lines(file_path) { + // Consumes the iterator, returns an (Optional) String + for line in lines { + if let Ok(ip) = line { + let split: Vec<&str> = ip.split(" ").collect(); + let dir = split[0]; + let steps: usize = split[1].parse().unwrap(); + if dir == "U" { + for _ in 0..steps { + println!("U {}", steps); + head.1 += 1; + if tail.1 - head.1 == -2 { + println!("U move {}", steps); + tail.0 = head.0; + tail.1 += 1; + *positions.entry(tail).or_insert(0) += 1; + } + } + } + else if dir == "D" { + for _ in 0..steps { + println!("D {}", steps); + head.1 -= 1; + if tail.1 - head.1 == 2 { + println!("D move {}", steps); + tail.0 = head.0; + tail.1 -= 1; + *positions.entry(tail).or_insert(0) += 1; + } + } + } + else if dir == "R" { + for _ in 0..steps { + println!("R {}", steps); + head.0 += 1; + if tail.0 - head.0 == -2 { + println!("R move {}", steps); + tail.1 = head.1; + tail.0 += 1; + *positions.entry(tail).or_insert(0) += 1; + } + } + } + else if dir == "L" { + for _ in 0..steps { + println!("L {}", steps); + head.0 -= 1; + if tail.0 - head.0 == 2 { + println!("L move {}", steps); + tail.1 = head.1; + tail.0 -= 1; + *positions.entry(tail).or_insert(0) += 1; + } + } + } + } + } + } + + println!("tail {:?}", tail); + println!("head {:?}", head); + println!("positions {:?}", positions); + println!("positions {}", positions.len()); +} + +fn read_lines
(filename: P) -> io::Result (filename: P) -> io::Result