From d02b18e2f5a7baf46e2c6c8a531b05b9851f5fa4 Mon Sep 17 00:00:00 2001 From: Irene Knapp Date: Thu, 2 Dec 2021 21:48:57 -0800 Subject: 03 --- 03/Cargo.toml | 11 + 03/input | 1000 +++++++++++++++++++++++++++++++++++++++++++++++++++ 03/src/.main.rs.swo | Bin 0 -> 12288 bytes 03/src/main.rs | 132 +++++++ 03/tests/main.rs | 17 + Cargo.lock | 8 + Cargo.toml | 1 + 7 files changed, 1169 insertions(+) create mode 100644 03/Cargo.toml create mode 100644 03/input create mode 100644 03/src/.main.rs.swo create mode 100644 03/src/main.rs create mode 100644 03/tests/main.rs diff --git a/03/Cargo.toml b/03/Cargo.toml new file mode 100644 index 0000000..189ca3f --- /dev/null +++ b/03/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "advent_03" +version = "0.1.0" +authors = ["Irene Knapp "] +edition = "2018" + +[dependencies] +advent_lib = { path = "../lib" } + +[dev-dependencies] +assert_cmd = "0.10" diff --git a/03/input b/03/input new file mode 100644 index 0000000..7320494 --- /dev/null +++ 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+010000010101 +000110111001 +100100100000 +110010001011 +110111100011 +101101101001 +100001100100 +000111010100 diff --git a/03/src/.main.rs.swo b/03/src/.main.rs.swo new file mode 100644 index 0000000..fead7a5 Binary files /dev/null and b/03/src/.main.rs.swo differ diff --git a/03/src/main.rs b/03/src/main.rs new file mode 100644 index 0000000..03c6d23 --- /dev/null +++ b/03/src/main.rs @@ -0,0 +1,132 @@ +use advent_lib::prelude::*; + + +fn main() -> Result<()> { + let mut args = std::env::args(); + if args.len() != 2 { + eprintln!("Usage: advent input"); + } + let _ = args.next(); + let filename = args.next().unwrap(); + + let input = advent_lib::read_lines_file(&filename)?; + + { + let mut frequencies = Vec::new(); + + for _ in 0 .. input[0].len() { + frequencies.push(0); + } + + for line in &input { + let mut i = 0; + for c in line.chars() { + match c { + '1' => { + frequencies[i] += 1; + }, + _ => { } + } + + i += 1; + } + } + + let n_lines = input.len(); + + let mut gamma = 0; + let mut epsilon = 0; + + for i in 0 .. frequencies.len() { + let bit_value = 1 << frequencies.len() - i - 1; + if frequencies[i] > n_lines / 2 { + gamma += bit_value; + } else { + epsilon += bit_value; + } + } + + println!("{}", gamma * epsilon); + } + + { + let n_bits = input[0].len(); + + let generator_line = filter(&input, 0, true); + let mut generator = 0; + + for i in 0 .. n_bits { + let bit_value = 1 << n_bits - i - 1; + if generator_line.chars().nth(i).unwrap() == '1' { + generator += bit_value; + } + } + + let scrubber_line = filter(&input, 0, false); + let mut scrubber = 0; + + for i in 0 .. n_bits { + let bit_value = 1 << n_bits - i - 1; + if scrubber_line.chars().nth(i).unwrap() == '1' { + scrubber += bit_value; + } + } + + println!("{}", generator * scrubber); + } + + Ok(()) +} + + +fn filter(input: &Vec, bit_offset: usize, want_most: bool) -> String { + if input.len() == 1 { + return input[0].clone(); + } + + let mut frequency = 0; + + for line in input { + match line.chars().nth(bit_offset).unwrap() { + '1' => { + frequency += 1; + }, + _ => { } + } + } + + let is_tied = frequency * 2 == input.len(); + let one_is_most = frequency > input.len() / 2; + + let mut new_input = Vec::new(); + for line in input { + let is_one = line.chars().nth(bit_offset).unwrap() == '1'; + let is_wanted = if is_tied { + if want_most { + is_one + } else { + !is_one + } + } else { + if want_most { + if one_is_most { + is_one + } else { + !is_one + } + } else { + if one_is_most { + !is_one + } else { + is_one + } + } + }; + if is_wanted { + new_input.push(line.clone()); + } + } + + return filter(&new_input, bit_offset + 1, want_most); +} + diff --git a/03/tests/main.rs b/03/tests/main.rs new file mode 100644 index 0000000..b74d88d --- /dev/null +++ b/03/tests/main.rs @@ -0,0 +1,17 @@ +use assert_cmd::prelude::*; +//use predicates::prelude::*; +use std::process::Command; + + +#[test] +fn personal_input() -> Result<(), Box> { + let mut command = Command::cargo_bin("advent_02")?; + + command.arg("input"); + command.assert().success().stdout( + "1813801\n\ + 1960569556\n"); + + Ok(()) +} + diff --git a/Cargo.lock b/Cargo.lock index 0f0320a..4a2594c 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -16,6 +16,14 @@ dependencies = [ "assert_cmd", ] +[[package]] +name = "advent_03" +version = "0.1.0" +dependencies = [ + "advent_lib", + "assert_cmd", +] + [[package]] name = "advent_lib" version = "0.1.0" diff --git a/Cargo.toml b/Cargo.toml index 1caad48..3f08bba 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -3,4 +3,5 @@ members = [ "lib", "01", "02", + "03", ] -- cgit 1.4.1