commit f3afa52c9b718d47c006e1076c87eedff9ef4bda
Author: Jan Christian Grünhage <jan.christian@gruenhage.xyz>
Date:   Wed Dec 1 23:05:08 2021 +0100

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3ceb93d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+/input
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f6c9aa0
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,131 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc-rs-2021"
+version = "0.1.0"
+dependencies = [
+ "aoc-runner",
+ "aoc-runner-derive",
+ "itertools",
+]
+
+[[package]]
+name = "aoc-runner"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d21ef9204ad206a5a3e918e9920da04e1118ad91ce4f23570be964b9d6b9dfcb"
+
+[[package]]
+name = "aoc-runner-derive"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba8b944269d3fee645d281b1335e1797044db497bb02d0098cc3fdb8900069cc"
+dependencies = [
+ "aoc-runner-internal",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "aoc-runner-internal"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "274b0ba7f3669a45ec0aaacf94eb032a749de880ab776091576cca94037c9982"
+dependencies = [
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
+[[package]]
+name = "either"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+dependencies = [
+ "either",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
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+
+[[package]]
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+checksum = "d7bc1a1ab1961464eae040d96713baa5a724a8152c1222492465b54322ec508b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0ffa0837f2dfa6fb90868c2b5468cad482e175f7dad97e7421951e663f2b527"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "syn"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5681870
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "aoc-rs-2021"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+aoc-runner = "0.3.0"
+aoc-runner-derive = "0.3.0"
+itertools = "0.10.1"
diff --git a/src/day_01.rs b/src/day_01.rs
new file mode 100644
index 0000000..94dc343
--- /dev/null
+++ b/src/day_01.rs
@@ -0,0 +1,55 @@
+use aoc_runner_derive::{aoc, aoc_generator};
+
+use itertools::Itertools;
+
+#[aoc_generator(day1)]
+pub fn parse_measurements(input: &str) -> Vec<usize> {
+    input
+        .split('\n')
+        .map(|input| input.parse().unwrap())
+        .collect()
+}
+
+#[aoc(day1, part1)]
+pub fn count_increases_indexed(input: &[usize]) -> usize {
+    let mut count = 0;
+    for i in 1..input.len() {
+        if input[i - 1] < input[i] {
+            count += 1;
+        }
+    }
+    count
+}
+
+#[aoc(day1, part1, tuple_windows)]
+pub fn count_increases_tuple_windows(input: &[usize]) -> usize {
+    let mut count = 0;
+    for (a, b) in input.iter().tuple_windows() {
+        if a < b {
+            count += 1;
+        }
+    }
+    count
+}
+
+#[aoc(day1, part2)]
+pub fn count_sliding_increases_indexed(input: &[usize]) -> usize {
+    let mut count = 0;
+    for i in 3..input.len() {
+        if input[i - 3] + input[i - 2] + input[i - 1] < input[i - 2] + input[i - 1] + input[i] {
+            count += 1;
+        }
+    }
+    count
+}
+
+#[aoc(day1, part2, tuple_windows)]
+pub fn count_sliding_increases_tuple_windows(input: &[usize]) -> usize {
+    let mut count = 0;
+    for (a, b, c, d) in input.iter().tuple_windows() {
+        if a + b + c < b + c + d {
+            count += 1;
+        }
+    }
+    count
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..5cda2df
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,5 @@
+use aoc_runner_derive::aoc_lib;
+
+pub mod day_01;
+
+aoc_lib! { year = 2021 }