From 72b1f346b9b03de2f91387464713859d9b494a8b Mon Sep 17 00:00:00 2001
From: Ishan Jain <contact@ishanjain.me>
Date: Mon, 18 Dec 2023 14:18:12 +0530
Subject: [PATCH] day18: added/optimized

---
 src/day18/1.rs       |  61 ++++-
 src/day18/2.rs       |  75 +++++-
 src/day18/input.txt  | 624 +++++++++++++++++++++++++++++++++++++++++++
 src/day18/sample.txt |  14 +
 4 files changed, 772 insertions(+), 2 deletions(-)
 create mode 100644 src/day18/input.txt
 create mode 100644 src/day18/sample.txt

diff --git a/src/day18/1.rs b/src/day18/1.rs
index b51073e..ee43716 100644
--- a/src/day18/1.rs
+++ b/src/day18/1.rs
@@ -1 +1,60 @@
-const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+#![feature(test)]
+extern crate test;
+
+const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+
+fn process(data: &str) -> i64 {
+    let mut answer = 0;
+    let mut internal = 0;
+
+    let (mut sx, mut sy) = (0, 0);
+
+    for line in data.lines() {
+        let line = line.as_bytes();
+        let l = line.len();
+
+        let line = &line[0..l - 10];
+        let dist = {
+            let mut dist = 0;
+            let mut power = 10i64.pow(line.len() as u32 - 3);
+            for c in line[2..].iter() {
+                dist += power * (c - b'0') as i64;
+                power /= 10;
+            }
+            dist
+        };
+
+        let (x, y) = match line[0] {
+            b'R' => (0, 1),
+            b'D' => (1, 0),
+            b'L' => (0, -1),
+            b'U' => (-1, 0),
+            _ => unreachable!(),
+        };
+
+        internal += ((x * dist) + (y * dist)).abs();
+        let (dx, dy) = (sx + (x * dist), sy + (y * dist));
+
+        answer += sx * dy - dx * sy;
+        sx = dx;
+        sy = dy;
+    }
+
+    let answer = answer.abs();
+
+    ((answer / 2) + 1) + (internal / 2)
+}
+
+fn main() {
+    for input in INPUTS.iter() {
+        println!("answer = {}", process(input));
+    }
+}
+
+#[bench]
+fn part1(b: &mut test::Bencher) {
+    b.iter(|| {
+        let v = process(INPUTS[INPUTS.len() - 1]);
+        test::black_box(v);
+    });
+}
diff --git a/src/day18/2.rs b/src/day18/2.rs
index b51073e..d798554 100644
--- a/src/day18/2.rs
+++ b/src/day18/2.rs
@@ -1 +1,74 @@
-const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+#![feature(test)]
+extern crate test;
+
+const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+
+fn process(data: &str) -> i64 {
+    let mut answer = 0;
+    let (mut sx, mut sy) = (0, 0);
+    let mut internal = 0;
+
+    for line in data.lines() {
+        let line = line.as_bytes();
+        let l = line.len();
+
+        let line = &line[l - 6 - 1..line.len() - 1];
+
+        let dist = hex2int(&line[0..5]);
+
+        let (x, y): (i64, i64) = match line[5] {
+            b'0' => (0, 1),
+            b'1' => (1, 0),
+            b'2' => (0, -1),
+            b'3' => (-1, 0),
+            _ => unreachable!(),
+        };
+
+        internal += ((x * dist) + (y * dist)).abs();
+        let (dx, dy) = (sx + (x * dist), sy + (y * dist));
+
+        answer += sx * dy - dx * sy;
+        sx = dx;
+        sy = dy;
+    }
+
+    let answer = answer.abs();
+
+    ((answer / 2) + 1) + (internal / 2)
+}
+
+#[inline]
+const fn hex2int(ip: &[u8]) -> i64 {
+    let mut out = 0;
+
+    let mut i = 0;
+    while i < ip.len() {
+        let byte = match ip[i] {
+            v @ b'0'..=b'9' => v - b'0',
+            v @ b'a'..=b'f' => v - b'a' + 10,
+            v @ b'A'..=b'F' => v - b'A' + 10,
+            _ => unreachable!(),
+        };
+
+        out <<= 4;
+        out |= byte as i64;
+
+        i += 1;
+    }
+
+    out
+}
+
+fn main() {
+    for input in INPUTS.iter() {
+        println!("answer = {}", process(input));
+    }
+}
+
+#[bench]
+fn part2(b: &mut test::Bencher) {
+    b.iter(|| {
+        let v = process(INPUTS[INPUTS.len() - 1]);
+        test::black_box(v);
+    });
+}
diff --git a/src/day18/input.txt b/src/day18/input.txt
new file mode 100644
index 0000000..281765a
--- /dev/null
+++ b/src/day18/input.txt
@@ -0,0 +1,624 @@
+R 4 (#5ca782)
+U 6 (#79d133)
+R 8 (#90d7f2)
+U 3 (#13cc11)
+R 3 (#57f4c0)
+U 4 (#b45f81)
+R 4 (#234cb2)
+U 2 (#2538d1)
+R 6 (#acb112)
+U 6 (#78f4b1)
+R 3 (#48a010)
+U 10 (#515b51)
+R 5 (#875db0)
+U 6 (#b4e871)
+R 2 (#57f4c2)
+U 4 (#0e2931)
+R 4 (#75a752)
+U 2 (#2d79f3)
+R 4 (#1130c2)
+U 4 (#2d79f1)
+L 10 (#6e3da2)
+U 3 (#87e5e3)
+L 3 (#366410)
+U 5 (#2dc7b3)
+L 2 (#78d162)
+U 5 (#e262a1)
+R 7 (#17ac42)
+U 3 (#e262a3)
+R 5 (#635eb2)
+U 3 (#69fb03)
+R 3 (#101b10)
+U 5 (#b0f563)
+R 4 (#79b6e0)
+U 2 (#b0f561)
+R 3 (#6a0a60)
+U 10 (#912f03)
+R 3 (#366412)
+U 7 (#302683)
+R 5 (#c46a92)
+D 6 (#99c7f3)
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+D 3 (#336151)
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+D 5 (#554ee1)
+L 5 (#566802)
+D 8 (#9ae051)
+L 3 (#566800)
+U 3 (#46d531)
+L 3 (#7f19a2)
+U 7 (#074733)
+L 4 (#a639d2)
+U 5 (#278b83)
+L 4 (#2636b2)
+D 6 (#0b9fa3)
+L 2 (#09a9b0)
+D 6 (#b62373)
+L 4 (#bbdce0)
+U 5 (#158a33)
+L 4 (#06e9f0)
+U 11 (#30e473)
+R 5 (#404bc2)
+U 3 (#681dc3)
+R 10 (#6b04d0)
+U 2 (#932813)
+R 6 (#a5e770)
+U 3 (#932811)
+L 4 (#2f31c0)
+U 5 (#8f8a13)
+R 7 (#238d72)
+U 3 (#347933)
+L 7 (#2ca2f2)
+U 5 (#4fe7e3)
+L 3 (#74c422)
+D 10 (#4fe7e1)
+L 2 (#4a8a02)
+D 3 (#8c6563)
+L 4 (#4c8982)
+U 2 (#64def3)
+L 5 (#21f8b2)
+U 10 (#88fd83)
diff --git a/src/day18/sample.txt b/src/day18/sample.txt
new file mode 100644
index 0000000..0ad754b
--- /dev/null
+++ b/src/day18/sample.txt
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
\ No newline at end of file