From 1d0ad880b2280477b6985d0f8bde25aa5259c8cd Mon Sep 17 00:00:00 2001
From: Timo Schneider <timoschneider04@gmail.com>
Date: Sun, 8 Dec 2024 00:55:40 +0100
Subject: [PATCH] added day02

---
 Cargo.lock               |    5 +
 Cargo.toml               |    1 +
 src/day02/Cargo.lock     |    7 +
 src/day02/Cargo.toml     |    6 +
 src/day02/input02.txt    | 1000 ++++++++++++++++++++++++++++++++++++++
 src/day02/src/lib.rs     |    2 +
 src/day02/src/part02a.rs |   31 ++
 src/day02/src/part02b.rs |   44 ++
 src/day02/story02a.txt   |   34 ++
 src/day02/story02b.txt   |   18 +
 src/main.rs              |    6 +-
 11 files changed, 1153 insertions(+), 1 deletion(-)
 create mode 100644 src/day02/Cargo.lock
 create mode 100644 src/day02/Cargo.toml
 create mode 100644 src/day02/input02.txt
 create mode 100644 src/day02/src/lib.rs
 create mode 100644 src/day02/src/part02a.rs
 create mode 100644 src/day02/src/part02b.rs
 create mode 100644 src/day02/story02a.txt
 create mode 100644 src/day02/story02b.txt

diff --git a/Cargo.lock b/Cargo.lock
index 004ad0a..ea42f0f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7,8 +7,13 @@ name = "AdventOfCode2024"
 version = "0.1.0"
 dependencies = [
  "day01",
+ "day02",
 ]
 
 [[package]]
 name = "day01"
 version = "0.1.0"
+
+[[package]]
+name = "day02"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 42d3995..8d6f0a4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,4 @@ opt-level = 2
 
 [dependencies]
 day01 = {path = "src/day01" }
+day02 = {path = "src/day02" }
\ No newline at end of file
diff --git a/src/day02/Cargo.lock b/src/day02/Cargo.lock
new file mode 100644
index 0000000..52d399b
--- /dev/null
+++ b/src/day02/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day02"
+version = "0.1.0"
diff --git a/src/day02/Cargo.toml b/src/day02/Cargo.toml
new file mode 100644
index 0000000..854585a
--- /dev/null
+++ b/src/day02/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day02"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/src/day02/input02.txt b/src/day02/input02.txt
new file mode 100644
index 0000000..af26180
--- /dev/null
+++ b/src/day02/input02.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/src/day02/src/lib.rs b/src/day02/src/lib.rs
new file mode 100644
index 0000000..f89298c
--- /dev/null
+++ b/src/day02/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod part02a;
+pub mod part02b;
\ No newline at end of file
diff --git a/src/day02/src/part02a.rs b/src/day02/src/part02a.rs
new file mode 100644
index 0000000..e9ee582
--- /dev/null
+++ b/src/day02/src/part02a.rs
@@ -0,0 +1,31 @@
+use std::fs::File;
+use std::io::Read;
+
+pub fn day02a() -> u64 {
+    // read file (that for sure exists) into two lists
+    let mut file: File = File::open("src/day02/input02.txt").unwrap();
+    let mut file_content: String = String::new();
+    file.read_to_string(&mut file_content).expect("Can't read file");
+
+    // analyze reports
+    let mut nr_or_correct_reports: u64 = 0;
+    // iterate over all reports
+    file_content.split("\n").for_each(|report| {
+        let levels: Vec<i32> = report.split(" ").map(|level| level.parse::<i32>().unwrap()).collect();
+        let mut trend: i32 = 0;
+        let mut safe: bool = true;
+        // iterate over all levels and ty to find a trend
+        levels.windows(2).for_each(|window| {
+            let local_trend: i32 = window[1] - window[0];
+            if local_trend == 0 || local_trend.abs() > 3
+                    || local_trend * trend < 0 {
+                safe = false
+            }
+            trend = local_trend
+        });
+
+        if safe {nr_or_correct_reports += 1}
+    });
+
+    nr_or_correct_reports
+}
\ No newline at end of file
diff --git a/src/day02/src/part02b.rs b/src/day02/src/part02b.rs
new file mode 100644
index 0000000..15aa998
--- /dev/null
+++ b/src/day02/src/part02b.rs
@@ -0,0 +1,44 @@
+use std::fs::File;
+use std::io::Read;
+
+pub fn day02b() -> u64 {
+    // read file (that for sure exists) into two lists
+    let mut file: File = File::open("src/day02/input02.txt").unwrap();
+    let mut file_content: String = String::new();
+    file.read_to_string(&mut file_content).expect("Can't read file");
+
+    // analyze reports
+    let mut nr_or_correct_reports: u64 = 0;
+    // iterate over all reports
+    file_content.split("\n").for_each(|report| {
+        let mut levels: Vec<i32> = report.split(" ").map(|level| level.parse::<i32>().unwrap()).collect();
+        let mut trend: i32 = 0;
+        let mut safe: i32 = 2;
+        // iterate over all levels and ty to find a trend
+        let mut skip: Option<i32> = None;
+        levels.windows(2).for_each(|window| {
+            let local_trend: i32;
+            if let Some(skipped) = skip {
+                local_trend = window[1] - skipped;
+                // don't need this anymore
+                skip = None
+            }
+            else {
+                local_trend = window[1] - window[0];
+            }
+            if local_trend == 0 || local_trend.abs() > 3
+                    || local_trend * trend < 0 {
+                // allow one skip
+                if safe == 2 {skip = Some(window[1])}
+                safe -= 1;
+            }
+            trend = local_trend
+        });
+
+        if safe > 0 {
+            nr_or_correct_reports += 1;
+        }
+    });
+
+    nr_or_correct_reports
+}
\ No newline at end of file
diff --git a/src/day02/story02a.txt b/src/day02/story02a.txt
new file mode 100644
index 0000000..c2a31cd
--- /dev/null
+++ b/src/day02/story02a.txt
@@ -0,0 +1,34 @@
+Fortunately, the first location The Historians want to search isn't a long walk from the Chief Historian's office.
+
+While the Red-Nosed Reindeer nuclear fusion/fission plant appears to contain no sign of the Chief Historian, the engineers there run up to you as soon as they see you. Apparently, they still talk about the time Rudolph was saved through molecular synthesis from a single electron.
+
+They're quick to add that - since you're already here - they'd really appreciate your help analyzing some unusual data from the Red-Nosed reactor. You turn to check if The Historians are waiting for you, but they seem to have already divided into groups that are currently searching every corner of the facility. You offer to help with the unusual data.
+
+The unusual data (your puzzle input) consists of many reports, one report per line. Each report is a list of numbers called levels that are separated by spaces. For example:
+
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9
+
+This example data contains six reports each containing five levels.
+
+The engineers are trying to figure out which reports are safe. The Red-Nosed reactor safety systems can only tolerate levels that are either gradually increasing or gradually decreasing. So, a report only counts as safe if both of the following are true:
+
+    The levels are either all increasing or all decreasing.
+    Any two adjacent levels differ by at least one and at most three.
+
+In the example above, the reports can be found safe or unsafe by checking those rules:
+
+    7 6 4 2 1: Safe because the levels are all decreasing by 1 or 2.
+    1 2 7 8 9: Unsafe because 2 7 is an increase of 5.
+    9 7 6 2 1: Unsafe because 6 2 is a decrease of 4.
+    1 3 2 4 5: Unsafe because 1 3 is increasing but 3 2 is decreasing.
+    8 6 4 4 1: Unsafe because 4 4 is neither an increase or a decrease.
+    1 3 6 7 9: Safe because the levels are all increasing by 1, 2, or 3.
+
+So, in this example, 2 reports are safe.
+
+Analyze the unusual data from the engineers. How many reports are safe?
\ No newline at end of file
diff --git a/src/day02/story02b.txt b/src/day02/story02b.txt
new file mode 100644
index 0000000..d6e6c6f
--- /dev/null
+++ b/src/day02/story02b.txt
@@ -0,0 +1,18 @@
+The engineers are surprised by the low number of safe reports until they realize they forgot to tell you about the Problem Dampener.
+
+The Problem Dampener is a reactor-mounted module that lets the reactor safety systems tolerate a single bad level in what would otherwise be a safe report. It's like the bad level never happened!
+
+Now, the same rules apply as before, except if removing a single level from an unsafe report would make it safe, the report instead counts as safe.
+
+More of the above example's reports are now safe:
+
+    7 6 4 2 1: Safe without removing any level.
+    1 2 7 8 9: Unsafe regardless of which level is removed.
+    9 7 6 2 1: Unsafe regardless of which level is removed.
+    1 3 2 4 5: Safe by removing the second level, 3.
+    8 6 4 4 1: Safe by removing the third level, 4.
+    1 3 6 7 9: Safe without removing any level.
+
+Thanks to the Problem Dampener, 4 reports are actually safe!
+
+Update your analysis by handling situations where the Problem Dampener can remove a single level from unsafe reports. How many reports are now safe?
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index aeb58cf..d8da1b7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,11 @@
 use day01::part01a::day01a;
 use day01::part01b::day01b;
+use day02::part02a::day02a;
+use day02::part02b::day02b;
 
 fn main() {
-    //println!("day01:A =>  {}", day01a());
+    println!("day01:A =>  {}", day01a());
     println!("day01:B =>  {}", day01b());
+    println!("day02:A =>  {}", day02a());
+    println!("day02:B =>  {}", day02b());
 }