From 467181d7b73b9747d8ea88041187c06d12cc0adf Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 7 Dec 2021 22:31:33 +0100
Subject: Add day3

---
 day3/Cargo.toml  |    8 +
 day3/input.txt   | 1000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 day3/src/main.rs |   36 ++
 3 files changed, 1044 insertions(+)
 create mode 100644 day3/Cargo.toml
 create mode 100644 day3/input.txt
 create mode 100644 day3/src/main.rs

(limited to 'day3')

diff --git a/day3/Cargo.toml b/day3/Cargo.toml
new file mode 100644
index 0000000..898e70d
--- /dev/null
+++ b/day3/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day3"
+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.txt b/day3/input.txt
new file mode 100644
index 0000000..b380427
--- /dev/null
+++ b/day3/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/day3/src/main.rs b/day3/src/main.rs
new file mode 100644
index 0000000..aa7eda7
--- /dev/null
+++ b/day3/src/main.rs
@@ -0,0 +1,36 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+
+fn main() -> Result<(), std::io::Error> {
+    let file = File::open("input.txt")?;
+    let reader = BufReader::new(&file);
+
+    let lines: Vec<_> = reader.lines().map(|x| x.unwrap()).collect::<Vec<String>>();
+    let mut bits: Vec<u32> = vec![0; lines[0].len()];
+    let half: u32 = (lines.len() / 2) as u32;
+    let mut gamma_string = String::new();
+    let mut epsilon_string = String::new();
+
+    for line in lines {
+        for (index, char) in line.chars().enumerate() {
+            bits[index] += char.to_digit(10).unwrap();
+        }
+    }
+
+    for bit in bits {
+        if bit >= half {
+            gamma_string.push('1');
+            epsilon_string.push('0');
+        } else {
+            gamma_string.push('0');
+            epsilon_string.push('1');
+        }
+    }
+    let gamma_rate = isize::from_str_radix(&gamma_string, 2).unwrap();
+    let epsilon_rate = isize::from_str_radix(&epsilon_string, 2).unwrap();
+
+    println!("{}", gamma_rate * epsilon_rate);
+
+    Ok(())
+}
-- 
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