From 8370d27bea0a88e08ce811506c3c0c89cfac75ee Mon Sep 17 00:00:00 2001
From: Fabian Schmidt <fabschmidt96@gmail.com>
Date: Mon, 28 Oct 2024 11:39:18 +0100
Subject: [PATCH] Started with aoc 2015, unable to make d4 part2 faster.
 Multi-threaded actually slower

---
 Cargo.lock                  |    9 +
 y2015/Cargo.toml            |    1 +
 y2015/resources/1_input.txt |    1 +
 y2015/resources/2_input.txt | 1000 +++++++++++++++++++++++++++++++++++
 y2015/resources/3_input.txt |    1 +
 y2015/src/bin/d1.rs         |   20 +
 y2015/src/bin/d2.rs         |   20 +
 y2015/src/bin/d3.rs         |   20 +
 y2015/src/bin/d4.rs         |   20 +
 y2015/src/days/d1.rs        |   74 +++
 y2015/src/days/d2.rs        |   57 ++
 y2015/src/days/d3.rs        |  111 ++++
 y2015/src/days/d4.rs        |   72 +++
 y2015/src/days/mod.rs       |    4 +
 y2015/src/lib.rs            |    1 +
 15 files changed, 1411 insertions(+)
 create mode 100644 y2015/resources/1_input.txt
 create mode 100644 y2015/resources/2_input.txt
 create mode 100644 y2015/resources/3_input.txt
 create mode 100644 y2015/src/bin/d1.rs
 create mode 100644 y2015/src/bin/d2.rs
 create mode 100644 y2015/src/bin/d3.rs
 create mode 100644 y2015/src/bin/d4.rs
 create mode 100644 y2015/src/days/d1.rs
 create mode 100644 y2015/src/days/d2.rs
 create mode 100644 y2015/src/days/d3.rs
 create mode 100644 y2015/src/days/d4.rs
 create mode 100644 y2015/src/days/mod.rs

diff --git a/Cargo.lock b/Cargo.lock
index 030b049..ca953c6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,9 +2,18 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "md5"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "490cc448043f947bae3cbee9c203358d62dbee0db12107a74be5c30ccfd09771"
+
 [[package]]
 name = "y2015"
 version = "0.1.0"
+dependencies = [
+ "md5",
+]
 
 [[package]]
 name = "y2016"
diff --git a/y2015/Cargo.toml b/y2015/Cargo.toml
index d2b71d3..c30cc93 100644
--- a/y2015/Cargo.toml
+++ b/y2015/Cargo.toml
@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+md5 = "0.7.0"
diff --git a/y2015/resources/1_input.txt b/y2015/resources/1_input.txt
new file mode 100644
index 0000000..becde71
--- /dev/null
+++ b/y2015/resources/1_input.txt
@@ -0,0 +1 @@
+((((()(()(((((((()))(((()((((()())(())()(((()((((((()((()(()(((()(()((())))()((()()())))))))))()((((((())((()))(((((()(((((((((()()))((()(())()((())((()(()))((()))()))()(((((()(((()()))()())((()((((())()())()((((())()(()(()(((()(())(()(())(((((((())()()(((())(()(()(()(())))(()((((())((()))(((()(()()(((((()()(()(((()(((((())()))()((()(()))()((()((((())((((())(()(((())()()(()()()()()(())((((())((())(()()))()((((())))((((()())()((((())((()())((())(())(((((()((((()(((()((((())(()(((()()))()))((((((()((())()())))(((()(()))(()()(()(((()(()))((()()()())((()()()(((())())()())())())((()))(()(()))(((((()(()(())((()(())(())()((((()())()))((((())(())((())())((((()(((())(())((()()((((()((((((()(())()()(()(()()((((()))(())()())()))(())))(())))())()()(())(()))()((()(()(())()()))(()())))))(()))(()()))(())(((((()(()(()()((())()())))))((())())((())(()(())((()))(())(((()((((((((()()()(()))()()(((()))()((()()(())(())())()(()(())))(((((()(())(())(()))))())()))(()))()(()(((((((()((((())))())())())())()((((((((((((((()()((((((()()()())())()())())())(())(())))())((()())((()(()))))))()))))))))))))))))())((())((())()()))))))(((()((()(()()))((())(()()))()()())))(())))))))(()(((())))())()())))()()(())()))()(()))())((()()))))(()))))()))(()()(())))))))()(((()))))()(()))(())())))))()))((()))((()))())(())))))))))((((())()))()))()))())(())()()(())))())))(()())()))((()()(())))(())((((((()(())((()(((()(()()(())))()))))))()))()(()((()))()(()))(()(((())((((())())(())(()))))))))())))))))())())))))())))))()()(((())()(()))))))))())))))(())()()()))()))()))(()(())()()())())))))))())()(()(()))))()()()))))())(()))))()()))))()())))))(((())()()))(()))))))))))()()))))()()()))))(()())())()()())()(()))))()(()))(())))))))(((((())(())())()()))()()))(())))))()(()))))(())(()()))()())()))()))()))()))))())()()))())())))(()))(()))))))())()(((())()))))))))()))()())))())))())))()))))))))))()()))(()()))))))(())()(()))))())(()))))(()))))(()())))))())())()()))))())()))))))))(()))))()))))))()(()())))))))()))())))())))())))())))))))())(()()))))))(()())())))()())()))))))))))))))())))()(())))()))())()()(())(()()))(())))())()())(()(()(()))))())))))))))))())(()))()))()))))(())()())()())))))))))))()()))))))))))))())())))))(()())))))))))))())(())))()))))))))())())(()))()))(())))()))()()(())()))))))()((((())()))())())))))()))()))))((()())()))))())))(())))))))))))))))))()))))()()())()))()()))))())()))((()())))())))(()))(()())))))))()))()))))(())))))))(())))))())()()(()))())()))()()))))())()()))))())()))())))))))(()))))()())()))))))))(()))())))(()))()))))(())()))())())(())())())))))))((((())))))()))()))()())()(())))()))()))()())(()())()()(()())()))))())())))))(()))()))))())(()()(())))))(())()()((())())))))(())(())))))))())))))))))()(())))))))()())())())()(()))))))))(()))))))))())()()))()(()))))))()))))))())))))))(())))()()(())()())))))(((())))()((())()))())))(()()))())(())())))()(((()())))))()(()()())))()()(()()(()()))())()(()()()))())()()))()())(()))))())))))())))(())()()))))(()))))(())(()))(())))))()()))()))))())()))()()(())())))((()))())()))))))()()))))((()(()))))()()))))))())))))())(()((()())))))))))))()())())))()))(()))))))(()))(())()())))(()))))))))())()()()()))))(()())))))))((())))()))(()))(())(())()())()))))))))(())))())))(()))()()))(()()))(()))())))()(())))())((()((()(())))((())))()))))((((())())()())))(())))()))))))())(()()((())))())()(()())))))(()())()))())))))))((())())))))))(()(()))())()()(()()(((()(((()())))))()))))))()(())(()()((()()(())()()))())()())()))()())())())))))))(((())))))))()()))))))(((())()))(()()))(()()))))(()(()()((((())()())((()()))))(()(())))))()((()()()())()()((()((()()))(()))(((()()()))(((())))()(((())()))))))((()(())())))(()())(((((()(()))(()((()))(()())()))))(()(()))()(()))(())(((())(()()))))()()))(((()))))(()()()()))())))((()()()(())()))()))))()()))()))))))((((((()()()))))())((()()(((()))))(()(())(()()())())())))()(((()()))(())((())))(()))(()()()())((())())())(()))))()))()((()(())()(()()(())(()))(())()))(())(()))))(())(())())(()()(()((()()((())))((()))()((())))(((()()()()((((()))(()()))()()()(((())((())())(()()(()()()))()((())(())()))())(((()()(())))()((()()())()())(()(())())(((())(())())((())(())()(((()()))(())))((())(()())())(())((()()()((((((())))((()(((((())()))()))(())(()()))()))(())()()))(())((()()())()()(()))())()((())))()((()()())((((()())((())())())((()((()))()))((())((()()(()((()()(((())(()()))))((()((())()(((())(()((())())((())(()((((((())())()(()())()(())(((())((((((()(())(()((()()()((()()(()()()())))()()(((((()()))()((((((()))()(()(()(()(((()())((()))())()((()))(())))()))()()))())()()))())((((())(()(()))(((((((())(((()(((((()(((()()((((())(((())())))(()()()(()(()))()))((((((()))((()(((()(())((()((((()((((((())(((((())))(((()(()))))(((()(((())()((())(()((()))(((()()(((())((((()(()(((((()))(((()(((((((()(()()()(()(()(()()())(())(((((()(())())()())(()(()(()))()(()()()())(()()(()((()))()((())())()(()))((())(()))()(()))()(((()(()(()((((((()()()()())()(((((()()(((()()()((()(((((()))((((((((()()()(((((()))))))(()()()(())(()))(()()))))((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diff --git a/y2015/resources/2_input.txt b/y2015/resources/2_input.txt
new file mode 100644
index 0000000..2f04474
--- /dev/null
+++ b/y2015/resources/2_input.txt
@@ -0,0 +1,1000 @@
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diff --git a/y2015/resources/3_input.txt b/y2015/resources/3_input.txt
new file mode 100644
index 0000000..f7791cc
--- /dev/null
+++ b/y2015/resources/3_input.txt
@@ -0,0 +1 @@
+v>v<vvv<<vv^v<v>vv>v<<<^^^^^<<^<vv>^>v^>^>^>^>^><vvvv<^>^<<^><<<^vvvv>^>^><^v^><^<>^^>^vvv^<vv>>^>^^<>><>^>vvv>>^vv>^<><>^<v^>^>^><vv^vv^>><<^><<v>><>^<^>>vvv>v>>>v<<^<><^<v<>v>^^v^^^<^v^^>>><^>^>v<>^<>>^>^^v^><v<v>>><>v<v^v>^v<>>^><v>^<>v^>^<>^v^^^v^^>>vv<<^^><^<vvv>^>^^<^>>^^^^^v^<v>vv<>>v^v<^v^^<><^<^vv^><>><><>v>vvv^vv^^<<><<vvv><<^v^><v<>vvv^<^>vvvv^>^>>^v^<v^vv<^^v<>v>vv^<>><v<<<^v^<<><v<^<^<><^^^>^>>v>^>v^<>v><^<^<v^>^^vv<^^<>v^v^vv<>>>>v^v<>><^^v>vv^^>v^v>v<vv>>v>><v^v^v>vv>^^>^v><<vv^v^^vv<^v><^<<v<v^>vv^^^<v^>v>v^^^>><^^<v^<^>>v><vv<v^^>^^v>>v^^^<^^v>^v>><^<^<>>v<<^^vv>^^^v<^<^<v<v^^vv>^vv^>>v^><v>><<<>^vv^<^<>v^^<<<v<^>^><><v^^>>^^^<^vv<^^^>><^^v>^^v^<v^v^>^^<v>^<^v<^<<<<^<v^>v^<^^<>^^>^><<>>^v><>><^<v><^^^>>vv>^><vv>^^^^^v^vvv><><^<^>v>v^v^>^><><^<^><>v<<vv<^>><>^v^^v>^<<<>^v^>^<<v^vv<>v^<v^^vv><<v^<>>>^<v>vv>v>>>^<^>><vv<>>>>v<v>>>^v>v><>>vvv<^^><<^>^>v<^vvvv<v><vv<><^^^v^^^>v^v<>v<^^v>>><>v<v^>>v><v^>>^^<v<<<^<v<><^^v><<v^><<<<^vv<^<>^><vv<<<<^>>>^v>^v>vv>^v<>v>v<v><^>>v>>^>^><^<v^v^>^v<><><^^>^<vvvv^^<>^^^>vv^v^v>^v^^v^^v><v^<^<>><^<v>v>>vv<<v>>vvvv<vv><>>^v^>^>>v^v^<<<vv<><v<<>>>^v<<v>^^vv^><>v>^>v><<<<<<<^>^^v^<<^^>>vvv^<><>><>^^v<<vv><^^v<^^><vv>v^>>>v^v><v^v<^>v^><>v<<>v>^^v><<<<><^v^v>>^<>^<<>^<v<<>>v<<>><^<<<<^v>^<^v>v>vv<v<v<<>^>v<^<<>v^<vvvv^>v>><<v><v<>v>v>>v^vvv^^>>>v^<^<<^^<<<><v>v^<<v<<<>v<^^<><v<v^^<v>^>v>>v<>^>^^>>^v<<>v^^^>>>^vv<^v<v>^>v>^><>v^^<>^^v^^vv^<^>^<<>><<^>^v>>><<<vvvv><<><v<^v^v<vvv^<><<^<vv><v^v^v^>v>v^<vvv^><^><^<vv><>>v^>^^^<>><v^<^^^<>v<<v<^v>>>^>>v^><<>vvv><^>>v><v><>v>>^>v><<><<>^<>^^^vv><v^>v^^>>^>^<^v<v<^^<^vvvv>v<v>^>v^>^><^<vvvv><^><><<v<>v<v^><^<v^>^v^^<<<<^><^^<^><>>^v<<^<<^vv>v>>v<^<^vv>><v<vv>v<v<v>^v<>^>v<>^v<<<v>>^^v>>><vvv>v^>^v^v>^^^v<vvvv>><^>vvv^<vv^^vv><<<>v<>v>^<vvv^<^<v<v<^vv^^>>vv^<^^v^><^^^^^v<^<v<^>>>vv^v^>^<v>^<><v^<^v>>><^v^<<v<<v<>v>^v<v^v>>^^v<<v<v<<>>>vv>>^v>>^<<<<^><<<><^^>>v<>^vvvv>v^^^>^^^>^<vvvv><^^v<v<>v<^v^v<<v^^^v^<v<^v>v^^<>^>^<^v>vv<v^vv<^<<>v><<^><><^^v<<><^^><>^v>^<><<^<^^<<>vv<>^^<<^>><<<>>vvv>^>v^^v^><<^>v>^>^<^<<>v<^>vv^v^v<>vv<<v>vv<vv><^>v^<>^vv^v^<v<^>>>>v^v><^<><<>vv^<vvv^>>vvv^>v>>><^^vv<vvvv>v<^<^>>^^>^^vv>>><^v<>^v^<<>v^^^<v>^>>^<^<v>>^v<^^^<v>^v>^>>v<vv>>^<v^<<>>^>>><v>v^<<^<v>>^<<^^<>v<^v<^<>v^v>^^v<vvvv>^vv>vvv>v^<^>><v^^vv<<<^>vvvv<>>^^<>v^<><>v<^<>v<>^>v<>vv<v^v>>v<v<^<v^^v^vv^vvv><^^>v>><>>^<^^<>>^>^<v^>>vvv^v><v>>^>^>v><><<><vv^v>v<>^v<^vv^^^<>^^<<^^^v<>><v<^<^<^<^^><v^v<^>v^>vvvv>^^v^>^<v<^^^>>^<<vv^<><><^^^^<<>^<><v>vv^<><^>^^<>v^<>>>v><>vvvvv>v>v^^>^<<vvvv<>vv>>v<<^<>^^^v^<><>>^<<<v<v<>>>><><v>v<v<>>^>^^^^vv^^<<><^^<<vv<^<>v>vv<v<><<<^<<v<<<<>v<>>^<^>^>><v>v>><^^<>><<<><<><v^^v<<><^<^v<v^><^^v<<>><<<<^>v^<v>><v^><v<vvv>v^v^<v><<>>v<><<v>^<>><>>^><>v^v>v<<>v<>v^^><<>>>v<<>>>>^>v>><v<<>>>vv>v>^<^^^<>v<v>^<^^v^vvv^>vv>^<v><vvvv>^<<>vvv<<<vv>^^<^>^>>v>v<<<<<>^^vv^>>v>^<^<v^v^>^v>>v>^v<><>^<^>v>v<<<^^^v>^<<<>vvv^v^^>^>>^>v>v<>^^><>>v>^>v<<<^^^v^<v^vv>><><^<^<><vvv<v^>>^v>vv<^v<<^vv>v^<<v>v>v>^v^>^v<<^v^vv>v<v>^<<><v^>>v<>><v<<<^v<<>vvv^<vv<vvv<<>^vv^^v><^>v^vv<<v^<<^^^<^<>^^<<>v<><<v>^><>^<><<v<v^^>vv<>^<v<^<vvv>vv>v><^^v<>><^v^v><><>><v<v>vv<>>><v^^v<>><<^>>><^^^vvv<<<vv<<^v<<<>><<vv>>>>v<<<<<vv><><v>v^^<<^vv^<vv<>>vv>^<>^v^^<>^^^vv>v^^<v<><v>v<v>>^v<v<>>^<v^^><>v^^^>v^^v<vv><^>v^v^<>v>v<v<^^>>v<^^vv^v<^^^^vv<<><<^>>^^<<v^^<<^>v^>>^^^><^^>^v^v>^<<v<vv<<<v<^^^>^>>^v<>^<^>v>^>^v^<^^^<^vv<v><^^>>v<v>^>^v^>>>>^v>^^<<^<v^v<^<<v<<^><^^<v^<><v>v^<<v^^<><<>>><vv<<><>^<>>>v<<v^^^v^^<<<vv<<^<^<^vv^<><><<^^<^^>v^>^<v<>>v^v<><<v>^^v>^<^<vvv<v>v^v>>>^^<^<v^>^vv<<<v<<>^><><^<>v>>>v<v^<>v>><^^^v^^^v<^^<vv^^^>v>v<>>^^<><>v>^<v<>^>>>><>v>^v>^vv^v<vv<<^^>><v<>^>^^<v<^>^<vvv>><>^<<>>><<<><>^^<<<v<>v^>v>v<v>^^^>^>^v<<>v>vv>><<<v>^^<v><vv<<v^^>^>>^><^>v<^<^v>><^^>v<vv^^><><>^><<><>v^>v<><^^>><>^<^^v<^<<v>><v><<<^^<<v<^vv^v<>><>>>^>v<vvv^>^<><v^><^<<^vv<^v^v^v<>v^^v>v^<^>^vv^>>><<>v^vv^<>^v^><<v^v<v>v^<><>>v^v^><>v^vvv^^^<<^<<v<<v<^vv^>>v^v>^^<v<>><>v>>v^<>^>v>^>><<>v^v><^v>v>>><v<v><^<^^>vv<v><^>^<^>^^v><><v<^^v<<><^<<v^<v<<><^^vvv^v>^>^<>>vv>v^^v^^vv<^^>><v^^vv><^v>v^<<v<^v>vvv<>>^v><<>^v<<<>^><^vv><<^^<v^>v<<v>^vv<>^v>>>><<<<^^<^v>^<^^<^<^^>>^^v>^^^^v^^^<<>^^vv<<v^^><v>><^<<><>^>v<>>v^^^>^v^^v^<v^v>v>>>>>^v>^>^^<vvv^^<v^<<<v<<>v>><^^^v<<^^<v>>^<^<^><^<<v^v><<vv<^<>>v>v>^v<><<v>^>vv^v<v>v><^<v>><>^<vv<v^^^^v<^^>><<^^>v>v>^^^<>v>^v^^>vv^vv<^^>><>^>^<>v>><>^v<<v>v>^><^^^v^<vv><<^v^>v^>vv>v^<>v><vv><^v>v<><v^v^v<^v<>^v<v^<<><<v>>^v><v>^^<>vvv^>^<<v^>><^>><^<>^v<v<v<^vvv<><<^v^<v>><<<v>^<^<v>v>^vv^v>v<^^vv<<vvv^<v>><>vv^>v<<>v<vvvv>>v>^^>>><<<^>^vv>><v>^^^>v<^vv<>v<<<v<<<<v>>>>^<^^^^>v<^^<><v>v>v<v^>vv^>v>v<^>^v^<>v>>vvv>^^><^vvv>><>>>^<<^<v<>>>v^^><v<v>>^><>v<^^v^<<v><>^<>>><^v^v>>>^vvvv^<><<<v<^>>v>^v^<v<v<<^<<v^vv^v>v<v<>>v<v^<<<><v^>><^<<^>^^><v>v<^v^<^>v>^<<v>v^<>v^<>vv^<>^>^>v^>^vv<>^^<<>>v<>^v<><v^><><<<vv>v>v^>vv^><<<<v>^v<><>^^<vv>v^^v^^^<v<^^><v^v<>><v<vv>^<>>><vv<^v<<>>^><>>v<v^v^>>>v<<>v<<<<<<<^v<<^^^v<^v<>v^^<<<^<>>v^vv<v>^<^^<^^<<^>vv><^<^^v<<<^><^v<^><>v<vv^>^v^^>>><<vv^^v><^<<^<>>^>>^<<<<v^vv<>>>v>^v>><>v>>v>><>v>><^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diff --git a/y2015/src/bin/d1.rs b/y2015/src/bin/d1.rs
new file mode 100644
index 0000000..0ef8964
--- /dev/null
+++ b/y2015/src/bin/d1.rs
@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2015::days::d1;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/1_input.txt")).unwrap();
+    println!("{}", d1::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/1_input.txt")).unwrap();
+    println!("{}", d1::process_part2(&content));
+}
diff --git a/y2015/src/bin/d2.rs b/y2015/src/bin/d2.rs
new file mode 100644
index 0000000..40ee9d0
--- /dev/null
+++ b/y2015/src/bin/d2.rs
@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2015::days::d2;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/2_input.txt")).unwrap();
+    println!("{}", d2::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/2_input.txt")).unwrap();
+    println!("{}", d2::process_part2(&content));
+}
diff --git a/y2015/src/bin/d3.rs b/y2015/src/bin/d3.rs
new file mode 100644
index 0000000..5fe04a8
--- /dev/null
+++ b/y2015/src/bin/d3.rs
@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2015::days::d3;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/3_input.txt")).unwrap();
+    println!("{}", d3::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/3_input.txt")).unwrap();
+    println!("{}", d3::process_part2(&content));
+}
diff --git a/y2015/src/bin/d4.rs b/y2015/src/bin/d4.rs
new file mode 100644
index 0000000..dcca0ed
--- /dev/null
+++ b/y2015/src/bin/d4.rs
@@ -0,0 +1,20 @@
+use std::time::Instant;
+
+use y2015::days::d4;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let now = Instant::now();
+    println!("{}", d4::process_part1("bgvyzdsv"));
+    println!("{}µs", now.elapsed().as_micros());
+}
+
+fn part2() {
+    let now = Instant::now();
+    println!("{}", d4::process_part2("bgvyzdsv"));
+    println!("{}µs", now.elapsed().as_micros());
+}
diff --git a/y2015/src/days/d1.rs b/y2015/src/days/d1.rs
new file mode 100644
index 0000000..28d6afe
--- /dev/null
+++ b/y2015/src/days/d1.rs
@@ -0,0 +1,74 @@
+use core::panic;
+
+pub fn process_part1(input: &str) -> i32 {
+    input
+        .chars()
+        .map(|char| {
+            if char == '(' {
+                1
+            } else if char == ')' {
+                -1
+            } else if char == '\n' {
+                0
+            } else {
+                panic!("Expected '(' or ')'")
+            }
+        })
+        .sum()
+}
+
+pub fn process_part2(input: &str) -> i32 {
+    let mut floor = 0;
+    let mut pos = 0;
+    for char in input.chars() {
+        pos += 1;
+        if char == '(' {
+            floor += 1;
+        } else if char == ')' {
+            floor += -1;
+        } else if char == '\n' {
+            floor += 0;
+        } else {
+            panic!("Expected '(' or ')'")
+        }
+        if floor == -1 {
+            break;
+        }
+    }
+    pos
+}
+
+#[cfg(test)]
+mod tests_1 {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = process_part1("(())");
+        assert_eq!(result, 0);
+        let result = process_part1("(())");
+        assert_eq!(result, 0);
+        let result = process_part1("(((");
+        assert_eq!(result, 3);
+        let result = process_part1("(()(()(");
+        assert_eq!(result, 3);
+        let result = process_part1("))(((((");
+        assert_eq!(result, 3);
+        let result = process_part1("())");
+        assert_eq!(result, -1);
+        let result = process_part1("))(");
+        assert_eq!(result, -1);
+        let result = process_part1(")))");
+        assert_eq!(result, -3);
+        let result = process_part1(")())())");
+        assert_eq!(result, -3);
+    }
+
+    #[test]
+    fn part2() {
+        let result = process_part2(")(())))(");
+        assert_eq!(result, 1);
+        let result = process_part2("()()))))");
+        assert_eq!(result, 5);
+    }
+}
diff --git a/y2015/src/days/d2.rs b/y2015/src/days/d2.rs
new file mode 100644
index 0000000..5399dd2
--- /dev/null
+++ b/y2015/src/days/d2.rs
@@ -0,0 +1,57 @@
+pub fn process_part1(input: &str) -> i64 {
+    input
+        .lines()
+        .map(|line| {
+            line.split("x")
+                .map(|dimension| dimension.parse::<i64>().unwrap())
+                .collect::<Vec<i64>>()
+        })
+        .map(|dimension| {
+            let squares = (
+                dimension[0] * dimension[1],
+                dimension[0] * dimension[2],
+                dimension[1] * dimension[2],
+            );
+            squares.0.min(squares.1).min(squares.2) + squares.0 * 2 + squares.1 * 2 + squares.2 * 2
+        })
+        .sum()
+}
+
+pub fn process_part2(input: &str) -> i64 {
+    input
+        .lines()
+        .map(|line| {
+            line.split("x")
+                .map(|dimension| dimension.parse::<i64>().unwrap())
+                .collect::<Vec<i64>>()
+        })
+        .map(|dimension| {
+            let bow = dimension[0] * dimension[1] * dimension[2];
+            let ribbon = {
+                let largest = dimension[0].max(dimension[1]).max(dimension[2]);
+                dimension[0] * 2 + dimension[1] * 2 + dimension[2] * 2 - largest * 2
+            };
+            bow + ribbon
+        })
+        .sum()
+}
+
+#[cfg(test)]
+mod tests_2 {
+    use super::*;
+
+    const INPUT: &str = "2x3x4
+1x1x10";
+
+    #[test]
+    fn it_works() {
+        let result = process_part1(INPUT);
+        assert_eq!(result, 101);
+    }
+
+    #[test]
+    fn part2() {
+        let result = process_part2(INPUT);
+        assert_eq!(result, 48);
+    }
+}
diff --git a/y2015/src/days/d3.rs b/y2015/src/days/d3.rs
new file mode 100644
index 0000000..46f1efe
--- /dev/null
+++ b/y2015/src/days/d3.rs
@@ -0,0 +1,111 @@
+use core::panic;
+use std::collections::HashSet;
+
+pub fn process_part1(input: &str) -> i64 {
+    let mut visited_coords = HashSet::new();
+    let mut last_coord = (0, 0);
+    visited_coords.insert(last_coord);
+    input.chars().for_each(|char| {
+        if char == '^' {
+            last_coord.1 += 1;
+            visited_coords.insert(last_coord);
+        } else if char == '>' {
+            last_coord.0 += 1;
+            visited_coords.insert(last_coord);
+        } else if char == '<' {
+            last_coord.0 -= 1;
+            visited_coords.insert(last_coord);
+        } else if char == 'v' {
+            last_coord.1 -= 1;
+            visited_coords.insert(last_coord);
+        } else if char == '\n' {
+            println!("The end");
+        } else {
+            panic!("Could not parse direction");
+        }
+    });
+    visited_coords.len() as i64
+}
+
+pub fn process_part2(input: &str) -> i64 {
+    let mut visited_coords = HashSet::new();
+    let mut last_coord = (0, 0);
+    let mut is_robot = false;
+    let mut last_robo_coord = (0, 0);
+    visited_coords.insert(last_coord);
+    input.chars().for_each(|char| {
+        if is_robot {
+            if char == '^' {
+                last_robo_coord.1 += 1;
+                visited_coords.insert(last_robo_coord);
+            } else if char == '>' {
+                last_robo_coord.0 += 1;
+                visited_coords.insert(last_robo_coord);
+            } else if char == '<' {
+                last_robo_coord.0 -= 1;
+                visited_coords.insert(last_robo_coord);
+            } else if char == 'v' {
+                last_robo_coord.1 -= 1;
+                visited_coords.insert(last_robo_coord);
+            } else if char == '\n' {
+                println!("The end");
+            } else {
+                panic!("Could not parse direction");
+            }
+        } else if char == '^' {
+            last_coord.1 += 1;
+            visited_coords.insert(last_coord);
+        } else if char == '>' {
+            last_coord.0 += 1;
+            visited_coords.insert(last_coord);
+        } else if char == '<' {
+            last_coord.0 -= 1;
+            visited_coords.insert(last_coord);
+        } else if char == 'v' {
+            last_coord.1 -= 1;
+            visited_coords.insert(last_coord);
+        } else if char == '\n' {
+            println!("The end");
+        } else {
+            panic!("Could not parse direction");
+        }
+        is_robot = !is_robot;
+    });
+    visited_coords.len() as i64
+}
+
+#[cfg(test)]
+mod tests_3 {
+    use super::*;
+
+    const INPUT: &str = ">
+^v
+^>v<
+^v^v^v^v^v";
+
+    #[test]
+    fn it_works() {
+        let mut lines = INPUT.lines();
+        let result = process_part1(lines.next().unwrap());
+        assert_eq!(result, 2);
+        let result = process_part1(lines.next().unwrap());
+        assert_eq!(result, 2);
+        let result = process_part1(lines.next().unwrap());
+        assert_eq!(result, 4);
+        let result = process_part1(lines.next().unwrap());
+        assert_eq!(result, 2);
+    }
+
+    #[test]
+    fn part2() {
+        let mut lines = INPUT.lines();
+        let result = process_part2(lines.next().unwrap());
+        assert_eq!(result, 2);
+        let result = process_part2(lines.next().unwrap());
+        assert_eq!(result, 3);
+        let result = process_part2(lines.next().unwrap());
+        assert_eq!(result, 3);
+        let result = process_part2(lines.next().unwrap());
+        assert_eq!(result, 11);
+    }
+}
diff --git a/y2015/src/days/d4.rs b/y2015/src/days/d4.rs
new file mode 100644
index 0000000..19035c8
--- /dev/null
+++ b/y2015/src/days/d4.rs
@@ -0,0 +1,72 @@
+use std::{
+    sync::{mpsc, Arc, Mutex},
+    thread,
+};
+
+pub fn process_part1(input: &str) -> i64 {
+    let mut n = 1;
+    loop {
+        let hash = md5::compute(format!("{input}{n}"));
+        let hash = format!("{hash:x}");
+        if hash.split_at(5).0 == "00000" {
+            break;
+        }
+        n += 1;
+    }
+    n
+}
+
+pub fn process_part2(input: &str) -> i64 {
+    let threads = thread::available_parallelism().unwrap().get();
+
+    let found = Arc::new(Mutex::new(false));
+
+    let (tx, rx) = mpsc::channel();
+    thread::scope(|s| {
+        for thread in 0..threads {
+            let tx_clone = tx.clone();
+            let found_clone = found.clone();
+            s.spawn(move || {
+                let mut n = thread + 1;
+                loop {
+                    {
+                        if *found_clone.lock().unwrap() {
+                            break;
+                        }
+                    }
+                    let hash = md5::compute(format!("{input}{n}"));
+                    let hash = format!("{hash:x}");
+                    if hash.split_at(6).0 == "000000" {
+                        let _ = tx_clone.send(n);
+                        let mut found_guard = found_clone.lock().unwrap();
+                        *found_guard = true;
+                        break;
+                    }
+                    n += 1;
+                }
+            });
+        }
+        drop(tx);
+        let mut res = vec![];
+        while let Ok(n) = rx.recv() {
+            res.push(n);
+        }
+        *res.iter().min().unwrap() as i64
+    })
+}
+
+#[cfg(test)]
+mod tests_4 {
+    use super::*;
+
+    const INPUT1: &str = "abcdef";
+    const INPUT2: &str = "pqrstuv";
+
+    #[test]
+    fn it_works() {
+        let result = process_part1(INPUT1);
+        assert_eq!(result, 609043);
+        let result = process_part1(INPUT2);
+        assert_eq!(result, 1048970);
+    }
+}
diff --git a/y2015/src/days/mod.rs b/y2015/src/days/mod.rs
new file mode 100644
index 0000000..61f448e
--- /dev/null
+++ b/y2015/src/days/mod.rs
@@ -0,0 +1,4 @@
+pub mod d1;
+pub mod d2;
+pub mod d3;
+pub mod d4;
diff --git a/y2015/src/lib.rs b/y2015/src/lib.rs
index e69de29..c73659c 100644
--- a/y2015/src/lib.rs
+++ b/y2015/src/lib.rs
@@ -0,0 +1 @@
+pub mod days;