From 768c9d24c437657ce47eceb28c1983e392651d9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thorben=20G=C3=BCnther?= <admin@xenrox.net>
Date: Wed, 7 Apr 2021 20:39:50 +0200
Subject: [PATCH] Solve day 2 part 1

---
 Cargo.lock        |   42 ++
 Cargo.toml        |    3 +
 README.md         |    3 +
 data/day02.dat    | 1000 +++++++++++++++++++++++++++++++++++++++++++++
 src/days.rs       |    1 +
 src/days/day02.rs |   63 +++
 src/main.rs       |    1 +
 7 files changed, 1113 insertions(+)
 create mode 100644 README.md
 create mode 100644 data/day02.dat
 create mode 100644 src/days/day02.rs

diff --git a/Cargo.lock b/Cargo.lock
index a368233..a21dee6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,47 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "aoc2020"
 version = "0.1.0"
+dependencies = [
+ "lazy_static",
+ "regex",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "memchr"
+version = "2.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
+
+[[package]]
+name = "regex"
+version = "1.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "957056ecddbeba1b26965114e191d2e8589ce74db242b6ea25fc4062427a5c19"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5f089152e60f62d28b835fbff2cd2e8dc0baf1ac13343bef92ab7eed84548"
diff --git a/Cargo.toml b/Cargo.toml
index e8e2bd6..1164e93 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+# Used for regex compiling https://docs.rs/regex/1.4.5/regex/#example-avoid-compiling-the-same-regex-in-a-loop
+lazy_static = "1"
+regex = "1"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1098cf3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+TODO:
+- Maybe don't use unwrap; expect better for error handling?
+- Make everything run parallel
diff --git a/data/day02.dat b/data/day02.dat
new file mode 100644
index 0000000..c2da11c
--- /dev/null
+++ b/data/day02.dat
@@ -0,0 +1,1000 @@
+8-11 l: qllllqllklhlvtl
+1-3 m: wmmmmmttm
+2-4 p: pgppp
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+6-10 m: mmmmmfmmmm
+9-11 s: sssssstsssgss
+2-6 n: nnfnpgnnnmnnn
+15-17 w: wwwwrswthgwhkwwrw
+5-9 h: lbhdhplmbnwh
+5-6 d: jdddqqt
diff --git a/src/days.rs b/src/days.rs
index 12b8f18..28326d5 100644
--- a/src/days.rs
+++ b/src/days.rs
@@ -1 +1,2 @@
 pub mod day01;
+pub mod day02;
diff --git a/src/days/day02.rs b/src/days/day02.rs
new file mode 100644
index 0000000..ef63291
--- /dev/null
+++ b/src/days/day02.rs
@@ -0,0 +1,63 @@
+use lazy_static::lazy_static;
+use regex::Regex;
+use std::fs;
+
+struct Policy {
+    letter: char,
+    min: usize,
+    max: usize,
+    password: String,
+}
+
+fn parse_contents(contents: String) -> Vec<Policy> {
+    let mut policies = Vec::new();
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"(\d+)-(\d+) ([a-z]): ([a-z]+)").unwrap();
+    }
+
+    for line in contents.lines() {
+        let caps = RE.captures(line).unwrap();
+        let policy = Policy {
+            letter: caps[3].parse().unwrap(),
+            min: caps[1].parse().unwrap(),
+            max: caps[2].parse().unwrap(),
+            password: caps[4].to_string(),
+        };
+        policies.push(policy);
+    }
+    policies
+}
+
+fn count_valid_passwords(policies: &Vec<Policy>) -> i32 {
+    let mut count_valid = 0;
+    for policy in policies {
+        let count = policy.password.matches(policy.letter).count();
+        if policy.min <= count && count <= policy.max {
+            count_valid += 1;
+        }
+    }
+    count_valid
+}
+
+pub fn get_solution() {
+    let contents = fs::read_to_string("data/day02.dat").expect("Could not read data");
+    let policies = parse_contents(contents);
+    let count_valid = count_valid_passwords(&policies);
+
+    println!("Day 2, part 1: {}", count_valid);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1() {
+        let contents = String::from(
+            "1-3 a: abcde
+            1-3 b: cdefg
+            2-9 c: ccccccccc",
+        );
+        assert_eq!(count_valid_passwords(&parse_contents(contents)), 2);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 67c6484..8565c40 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,4 +2,5 @@ mod days;
 
 fn main() {
     days::day01::get_solution();
+    days::day02::get_solution();
 }
-- 
2.44.0