2022 rust day 4

2022/rust/Cargo.lock

@@ -2,6 +2,41 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "regex"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e076559ef8e241f2ae3479e36f97bd5741c0330689e217ad51ce2c76808b868a"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
+
 [[package]]
 name = "rust"
 version = "0.1.0"
+dependencies = [
+ "regex",
+]

2022/rust/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+regex = "1.7.0"

2022/rust/inputs/scratch.txt

@@ -1,6 +1,6 @@
-vJrwpWtwJgWrhcsFMMfFFhFp
-jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
-PmmdzqPrVvPwwTWBwg
-wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
-ttgJtRGJQctTZtZT
-CrZsJsPPZsGzwwsLwLmpwMDw
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

2022/rust/src/main.rs

@@ -3,5 +3,5 @@ mod solutions;
 
 
 fn main() {
-    solutions::day03::run();
+    solutions::day04::run();
 }

2022/rust/src/solutions/day04.rs

@@ -0,0 +1,51 @@
+#![allow(dead_code)]
+use regex::Regex;
+use crate::utils;
+
+
+pub fn run() -> () {
+    let data = parse_data(utils::read_lines(utils::Source::Day(4)));
+
+    println!("Day 4");
+    println!("Part 1: {}", solve1(&data));
+    println!("Part 2: {}", solve2(&data));
+}
+
+
+fn solve1(data: &Vec<((i32, i32), (i32, i32))>) -> i32 {
+    data.iter()
+        .copied()
+        .map(|((s1, e1), (s2, e2))|
+            if s1 <= s2 && e2 <= e1 || s2 <= s1 && e1 <= e2 { 1 } else { 0 }
+        )
+        .sum()
+}
+
+fn solve2(data: &Vec<((i32, i32), (i32, i32))>) -> i32 {
+    data.iter()
+        .copied()
+        .map(|((s1, e1), (s2, e2))|
+            if s1 <= e2 && s2 <= e1 { 1 } else { 0 }
+        )
+        .sum()
+}
+
+
+fn parse_data(data: Vec<String>) -> Vec<((i32, i32), (i32, i32))> {
+    let re = Regex::new(r"^(\d+)-(\d+),(\d+)-(\d+)$").unwrap();
+    data.iter()
+        .map(|s| {
+            let c = re.captures(s).unwrap();
+            (
+                (
+                    c.get(1).unwrap().as_str().parse().unwrap(),
+                    c.get(2).unwrap().as_str().parse().unwrap(),
+                ),
+                (
+                    c.get(3).unwrap().as_str().parse().unwrap(),
+                    c.get(4).unwrap().as_str().parse().unwrap(),
+                ),
+            )
+        })
+        .collect()
+}

2022/rust/src/solutions/mod.rs

@@ -1,3 +1,4 @@
 pub mod day01;
 pub mod day02;
 pub mod day03;
+pub mod day04;