init

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "anyhow"
+version = "1.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b26702f315f53b6071259e15dd9d64528213b44d61de1ec926eca7715d62203"
+
+[[package]]
+name = "aoc2021"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "itertools",
+ "thiserror",
+]
+
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
+[[package]]
+name = "itertools"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69ddb889f9d0d08a67338271fa9b62996bc788c7796a5c18cf057420aaed5eaf"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba508cc11742c0dc5c1659771673afbab7a0efab23aa17e854cbab0837ed0b43"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8daf5dd0bb60cbd4137b1b587d2fc0ae729bc07cf01cd70b36a1ed5ade3b9d59"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa32fd3f627f367fe16f893e2597ae3c05020f8bba2666a4e6ea73d377e5714b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

Cargo.toml

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+[package]
+name = "aoc2021"
+version = "0.1.0"
+authors = ["Stefan Schwarz <stefan@f2o.io>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0"
+itertools = "0.10"
+thiserror = "1.0"
+
+[[bin]]
+name = "1"
+path = "src/01.rs"
+
+[[bin]]
+name = "2"
+path = "src/02.rs"

src/01.rs

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+static INPUT: &str = include_str!("01.txt");
+
+fn main() {
+    let mut counter = 0;
+    INPUT.lines().fold(None, |last, line| {
+        let cur: u32 = line.parse().expect("line must be numeric");
+        if let Some(last) = last {
+            if cur > last {
+                counter += 1;
+            }
+        }
+        Some(cur)
+    });
+    println!("increased {} times", counter);
+
+    let mut counter = 0;
+    let splitted: Vec<u32> = INPUT
+        .lines()
+        .map(|line| line.parse().expect("line must be a number"))
+        .collect();
+    splitted
+        .windows(3)
+        .map(|win| {
+            if let [a, b, c] = win {
+                a + b + c
+            } else {
+                unreachable!("line must be a number")
+            }
+        })
+        .fold(None, |last, cur| {
+            if let Some(last) = last {
+                if cur > last {
+                    counter += 1;
+                }
+            }
+            Some(cur)
+        });
+    println!("increased {} times", counter);
+}

src/02.rs

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+static INPUT: &str = include_str!("02.txt");
+
+fn main() {
+    // part 1
+    let mut pos: i32 = 0;
+    let mut depth: i32 = 0;
+    INPUT
+        .lines()
+        .map(|line| {
+            let mut line = line.splitn(2, " ");
+            let direction = line.next().expect("no direction set");
+            let delta: i32 = line
+                .next()
+                .expect("no delta set")
+                .parse()
+                .expect("delta must be a number");
+            match direction {
+                "forward" => pos += delta,
+                "down" => depth += delta,
+                "up" => depth -= delta,
+                _ => unimplemented!("unknown direction instruction"),
+            }
+        })
+        .count();
+    println!("---");
+    println!("pos: {}, depth: {}", pos, depth);
+    println!("result: {}", pos * depth);
+
+    // part 2
+    let mut pos: i32 = 0;
+    let mut depth: i32 = 0;
+    let mut aim: i32 = 0;
+    INPUT
+        .lines()
+        .map(|line| {
+            let mut line = line.splitn(2, " ");
+            let direction = line.next().expect("no direction set");
+            let delta: i32 = line
+                .next()
+                .expect("no delta set")
+                .parse()
+                .expect("delta must be a number");
+            match direction {
+                "forward" => {
+                    pos += delta;
+                    depth += aim * delta;
+                }
+                "down" => aim += delta,
+                "up" => aim -= delta,
+                _ => unimplemented!("unknown direction instruction"),
+            }
+        })
+        .count();
+    println!("---");
+    println!("pos: {}, depth: {}", pos, depth);
+    println!("result: {}", pos * depth)
+}

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}