7 files changed, 1169 insertions, 0 deletions

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 <ireneista@gmail.com>"]
+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
+++ b/03/input
@@ -0,0 +1,1000 @@
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diff --git a/03/src/.main.rs.swo b/03/src/.main.rs.swo
new file mode 100644
index 0000000..fead7a5
--- /dev/null
+++ b/03/src/.main.rs.swo
Binary files differdiff --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<String>, 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<dyn std::error::Error>> {
+  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
@@ -17,6 +17,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "advent_03"
+version = "0.1.0"
+dependencies = [
+ "advent_lib",
+ "assert_cmd",
+]
+
+[[package]]
 name = "advent_lib"
 version = "0.1.0"
 dependencies = [
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",
 ]