From 3cd8684e2a447ed70486d3847e2c374d8c6fd12b Mon Sep 17 00:00:00 2001 From: Louis Vallat Date: Sat, 4 Dec 2021 01:12:20 +0100 Subject: [PATCH] Added day 3 code for part 1 and 2 Signed-off-by: Louis Vallat --- day3/Cargo.toml | 8 + day3/input | 1000 ++++++++++++++++++++++++++++++++++++++++++++++ day3/src/main.rs | 79 ++++ 3 files changed, 1087 insertions(+) create mode 100644 day3/Cargo.toml create mode 100644 day3/input create mode 100644 day3/src/main.rs diff --git a/day3/Cargo.toml b/day3/Cargo.toml new file mode 100644 index 0000000..8aa34bb --- /dev/null +++ b/day3/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/day3/input b/day3/input new file mode 100644 index 0000000..3566496 --- /dev/null +++ b/day3/input @@ -0,0 +1,1000 @@ +101000001100 +011111100111 +111100001110 +110000011001 +001001001011 +010011101000 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--git a/day3/src/main.rs b/day3/src/main.rs new file mode 100644 index 0000000..4904ad5 --- /dev/null +++ b/day3/src/main.rs @@ -0,0 +1,79 @@ +use std::{fs, env, vec}; + + +fn read_input(path: &str) -> String { + return fs::read_to_string(path).expect("Cannot read file."); +} + +fn parse_input(s: &str) -> Vec> { + let mut r: Vec> = vec![]; + for e in s.split("\n") { + if !e.is_empty() { + r.push(e.chars().filter_map(|e| e.to_digit(2)).collect()); + } + } + return r; +} + +fn bit_vec_to_u32(v: &Vec, invert: bool) -> u32 { + let mut acc = 0; + for i in 0..v.len() { + acc += if invert { (v[i] + 1) % 2 } else { v[i] } << (v.len() - 1 - i); + } + return acc; +} + +fn get_most_in_col(v: &Vec>, c: usize) -> u32 { + let mut a = (0, 0); + for r in 0..v.len() { + if v[r][c] == 0 { + a.0 += 1; + } else { + a.1 += 1; + } + } + if a.1 == a.0 { return 1; } + else { return if a.1 > a.0 { 1 } else { 0 }; } +} + +fn get_o2(v: &Vec>, c: usize) -> u32 { + if v.len() == 1 { return bit_vec_to_u32(&v[0], false); } + + let a = get_most_in_col(&v, c); + let f = v.into_iter().filter(|e| e[c] == (a + 1) % 2) + .fold(vec![], |mut acc, e| { acc.push(e.to_owned()); return acc;}); + return get_o2(&f, c + 1); +} + +fn get_co2(v: &Vec>, c: usize) -> u32 { + if v.len() == 1 { return bit_vec_to_u32(&v[0], false); } + + let a = get_most_in_col(&v, c); + let f = v.into_iter().filter(|e| e[c] == a) + .fold(vec![], |mut acc, e| { acc.push(e.to_owned()); return acc;}); + return get_co2(&f, c + 1); +} + +fn get_gamma_epsilon(v: &Vec>) -> (u32, u32) { + let mut acc: Vec = vec![]; + + for c in 0..v[0].len() { + acc.push(get_most_in_col(&v, c)); + } + return (bit_vec_to_u32(&acc, false), bit_vec_to_u32(&acc, true)); +} + + +fn main() { + let args: Vec = env::args().collect(); + for arg in args.iter().skip(1) { + let v = parse_input(&read_input(&arg)); + let t = get_gamma_epsilon(&v); + let o = get_o2(&v, 0); + let c = get_co2(&v, 0); + println!("[{}]", arg); + println!("\tPart 1 : {} x {} = {}", t.0, t.1, t.0 * t.1); + println!("\tPart 2 : {} x {} = {}", o, c, o * c); + } +} +