From c51d28eb75528c8a48b0b3f73fca0ae51031eac3 Mon Sep 17 00:00:00 2001
From: StNicolay <stnicolay2007@mail.ru>
Date: Sun, 1 Dec 2024 15:10:20 +0300
Subject: [PATCH] Day 1

---
 .gitignore  |  2 ++
 Cargo.lock  |  7 +++++++
 Cargo.toml  | 13 +++++++++++++
 src/main.rs | 42 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b08fc6c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+input.txt
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..aa37fc3
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "testing"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..cd969b7
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "testing"
+version = "0.1.0"
+edition = "2021"
+
+[profile.release]
+debug = 1
+
+[lints.clippy]
+pedantic = "warn"
+all = "warn"
+
+[dependencies]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..5c85b13
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,42 @@
+use std::{
+    collections::HashMap,
+    fs::File,
+    io::{BufRead, BufReader},
+};
+
+#[allow(dead_code)]
+fn day1_1() {
+    let reader = BufReader::new(File::open("input.txt").unwrap());
+    let mut a = Vec::<i32>::new();
+    let mut b = Vec::<i32>::new();
+    for line in reader.lines() {
+        let line = line.unwrap();
+        let (a1, b1) = line.trim_end().split_once("   ").unwrap();
+        a.push(a1.parse().unwrap());
+        b.push(b1.parse().unwrap());
+    }
+    a.sort_unstable();
+    b.sort_unstable();
+    let result: i32 = a.into_iter().zip(b).map(|(a, b)| (a - b).abs()).sum();
+    println!("{result}");
+}
+
+#[allow(dead_code)]
+fn day1_2() {
+    let reader = BufReader::new(File::open("input.txt").unwrap());
+    let mut a = Vec::<u32>::new();
+    let mut b = HashMap::<u32, u32>::new();
+    for line in reader.lines() {
+        let line = line.unwrap();
+        let (a1, b1) = line.trim_end().split_once("   ").unwrap();
+        a.push(a1.parse().unwrap());
+        *b.entry(b1.parse().unwrap()).or_insert(0) += 1;
+    }
+    let result: u32 = a.into_iter().map(|a| a * *b.get(&a).unwrap_or(&0)).sum();
+    println!("{result}");
+}
+
+fn main() {
+    day1_1();
+    day1_2();
+}