diff --git a/Cargo.lock b/Cargo.lock
index 5ad0563..348a058 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,11 +8,21 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "aoc2023"
 version = "0.1.0"
 dependencies = [
  "ureq",
+ "z3",
 ]
 
 [[package]]
@@ -21,6 +31,32 @@ version = "0.21.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "35636a1494ede3b646cc98f74f8e62c773a38a659ebc777a2cf26b9b74171df9"
 
+[[package]]
+name = "bindgen"
+version = "0.66.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2b84e06fc203107bfbad243f4aba2af864eb7db3b1cf46ea0a023b0b433d2a7"
+dependencies = [
+ "bitflags",
+ "cexpr",
+ "clang-sys",
+ "lazy_static",
+ "lazycell",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+ "syn",
+]
+
+[[package]]
+name = "bitflags"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "327762f6e5a765692301e5bb513e0d9fef63be86bbc14528052b1cd3e6f03e07"
+
 [[package]]
 name = "cc"
 version = "1.0.83"
@@ -30,12 +66,41 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "cexpr"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clang-sys"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c688fc74432808e3eb684cae8830a86be1d66a2bd58e1f248ed0960a590baf6f"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
+[[package]]
+name = "cmake"
+version = "0.1.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a31c789563b815f77f4250caee12365734369f942439b7defd71e18a48197130"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.3.2"
@@ -75,6 +140,12 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
 [[package]]
 name = "idna"
 version = "0.5.0"
@@ -85,18 +156,52 @@ dependencies = [
  "unicode-normalization",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "lazycell"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
+
 [[package]]
 name = "libc"
 version = "0.2.150"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "89d92a4743f9a61002fae18374ed11e7973f530cb3a3255fb354818118b2203c"
 
+[[package]]
+name = "libloading"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b67380fd3b2fbe7527a606e18729d21c6f3951633d0500574c4dc22d2d638b9f"
+dependencies = [
+ "cfg-if",
+ "winapi",
+]
+
 [[package]]
 name = "log"
 version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
+[[package]]
+name = "memchr"
+version = "2.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.7.1"
@@ -106,18 +211,81 @@ dependencies = [
  "adler",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
+[[package]]
+name = "peeking_take_while"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
 
+[[package]]
+name = "proc-macro2"
+version = "1.0.71"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75cb1540fadbd5b8fbccc4dddad2734eba435053f725621c070711a14bb5f4b8"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "regex"
+version = "1.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
 [[package]]
 name = "ring"
 version = "0.17.6"
@@ -132,6 +300,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustls"
 version = "0.21.9"
@@ -164,12 +338,29 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7cee0529a6d40f580e7a5e6c495c8fbfe21b7b52795ed4bb5e62cdf92bc6380"
+
 [[package]]
 name = "spin"
 version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
 
+[[package]]
+name = "syn"
+version = "2.0.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b7d0a2c048d661a1a59fcd7355baa232f7ed34e0ee4df2eef3c1c1c0d3852d8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
@@ -191,6 +382,12 @@ version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
 
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
 [[package]]
 name = "unicode-normalization"
 version = "0.1.22"
@@ -245,6 +442,28 @@ version = "0.25.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1778a42e8b3b90bff8d0f5032bf22250792889a5cdc752aa0020c84abe3aaf10"
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-sys"
 version = "0.48.0"
@@ -310,3 +529,23 @@ name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "z3"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a7ff5718c079e7b813378d67a5bed32ccc2086f151d6185074a7e24f4a565e8"
+dependencies = [
+ "log",
+ "z3-sys",
+]
+
+[[package]]
+name = "z3-sys"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7cf70fdbc0de3f42b404f49b0d4686a82562254ea29ff0a155eef2f5430f4b0"
+dependencies = [
+ "bindgen",
+ "cmake",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 2248a86..86f3d1c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ default-run = "main"
 
 [dependencies]
 ureq = { version = "2.9.1" }
+z3 = { version = "0.12.1", features = ["static-link-z3"] }
 
 
 [[bin]]
diff --git a/src/day24/1.rs b/src/day24/1.rs
index b51073e..45bc21a 100644
--- a/src/day24/1.rs
+++ b/src/day24/1.rs
@@ -1 +1,93 @@
-const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+#![feature(test)]
+
+use std::ops::RangeInclusive;
+
+extern crate test;
+
+const INPUTS: [&str; 1] = [include_str!("./input.txt")];
+
+fn process(data: &str) -> i64 {
+    let mut answer = 0;
+
+    let mut stones = vec![];
+    for line in data.lines() {
+        let (a, b) = line.split_once(" @ ").unwrap();
+
+        let mut pos = a
+            .split(',')
+            .map(|x| x.trim())
+            .map(|x| x.parse::<i64>().unwrap());
+
+        let mut vel = b
+            .split(',')
+            .map(|x| x.trim())
+            .map(|x| x.parse::<i64>().unwrap());
+
+        stones.push((
+            (pos.next().unwrap(), pos.next().unwrap()),
+            (vel.next().unwrap(), vel.next().unwrap()),
+        ));
+    }
+
+    for i in 0..stones.len() {
+        let a = stones[i];
+
+        let x1 = a.0 .0;
+        let y1 = a.0 .1;
+        let x2 = a.0 .0 + a.1 .0;
+        let y2 = a.0 .1 + a.1 .1;
+
+        let m1 = (y2 - y1) as f64 / (x2 - x1) as f64;
+        let c1 = y1 as f64 - m1 * x1 as f64;
+
+        for b in stones.iter().skip(i + 1) {
+            let x3 = b.0 .0;
+            let y3 = b.0 .1;
+            let x4 = b.0 .0 + b.1 .0;
+            let y4 = b.0 .1 + b.1 .1;
+
+            let m2 = (y4 - y3) as f64 / (x4 - x3) as f64;
+            let c2 = y3 as f64 - m2 * x3 as f64;
+
+            // parallel or coincidental
+            if m1 == m2 {
+                continue;
+            }
+
+            // y = m1 * x + c1;
+            // y = m2 * x + c2;
+            // x if y is equal
+            // (c1 - c2) / (m1 - m2)
+            // put this back in x and then y is
+            // y = m1 * i_x + c1
+            let i_x = (c2 - c1) / (m1 - m2);
+            let i_y = m1 * i_x + c1;
+
+            if (i_x - x1 as f64).signum() as i64 != a.1 .0.signum()
+                || (i_x - x3 as f64).signum() as i64 != b.1 .0.signum()
+            {
+                continue;
+            }
+
+            const LOOKUP_RANGE: RangeInclusive<f64> = 200000000000000.0..=400000000000000.0;
+
+            answer += (LOOKUP_RANGE.contains(&i_x) && LOOKUP_RANGE.contains(&i_y)) as i64
+        }
+    }
+
+    answer
+}
+
+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/day24/2.rs b/src/day24/2.rs
index b51073e..1ebfef6 100644
--- a/src/day24/2.rs
+++ b/src/day24/2.rs
@@ -1 +1,84 @@
-const INPUTS: [&'static str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+#![feature(test)]
+
+use z3::{
+    ast::{Ast, Int},
+    Config, Context, SatResult, Solver,
+};
+
+extern crate test;
+
+const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+
+fn process(data: &str) -> i64 {
+    let config = Config::new();
+    let ctx = Context::new(&config);
+    let solver = Solver::new(&ctx);
+
+    let x = Int::new_const(&ctx, "X");
+    let v_x = Int::new_const(&ctx, "V_X");
+    let y = Int::new_const(&ctx, "Y");
+    let v_y = Int::new_const(&ctx, "V_Y");
+    let z = Int::new_const(&ctx, "Z");
+    let v_z = Int::new_const(&ctx, "V_Z");
+    let zero = Int::from_i64(&ctx, 0);
+
+    let mut i = 0;
+    for line in data.lines() {
+        i += 1;
+        let (a, b) = line.split_once(" @ ").unwrap();
+
+        let pos: Vec<i64> = a
+            .split(',')
+            .map(|x| x.trim())
+            .map(|x| x.parse::<i64>().unwrap())
+            .collect();
+        let vel: Vec<i64> = b
+            .split(',')
+            .map(|x| x.trim())
+            .map(|x| x.parse::<i64>().unwrap())
+            .collect();
+
+        let s_x = Int::from_i64(&ctx, pos[0]);
+        let s_y = Int::from_i64(&ctx, pos[1]);
+        let s_z = Int::from_i64(&ctx, pos[2]);
+
+        let s_vx = Int::from_i64(&ctx, vel[0]);
+        let s_vy = Int::from_i64(&ctx, vel[1]);
+        let s_vz = Int::from_i64(&ctx, vel[2]);
+
+        let t = Int::new_const(&ctx, i);
+
+        // For every stone,
+        // X + V_X * t == sx + s_vx * t;
+        // Y + V_Y * t == sy + s_vy * t;
+        // Z + V_Z * t == sz + s_vz * t;
+
+        solver.assert(&t.ge(&zero));
+        solver.assert(&((&x + &v_x * &t)._eq(&(&s_x + &s_vx * &t))));
+        solver.assert(&((&y + &v_y * &t)._eq(&(&s_y + &s_vy * &t))));
+        solver.assert(&((&z + &v_z * &t)._eq(&(&s_z + &s_vz * &t))));
+    }
+
+    let result = solver.check();
+    if result != SatResult::Sat {
+        unreachable!();
+    }
+    let model = solver.get_model().unwrap();
+    let result = model.eval(&(&x + &y + &z), true).unwrap();
+
+    result.as_i64().unwrap()
+}
+
+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/day24/input.txt b/src/day24/input.txt
new file mode 100644
index 0000000..e8c1ec2
--- /dev/null
+++ b/src/day24/input.txt
@@ -0,0 +1,300 @@
+275325627102914, 177556324137106, 279758114394131 @ 249, 405, -531
+284428334220238, 231958436807561, 189800593445547 @ 237, 140, -111
+208260774362545, 354915461185166, 308973039318009 @ 128, -159, -65
+216164836660573, 46115124669763, 85595839318699 @ 302, 688, 387
+387160819800868, 326055172786046, 424274962581514 @ -169, -60, -78
+251635755786500, 217097084907301, 177350631711689 @ 131, 118, 125
+247915698072060, 256017235539750, 406425467500058 @ -10, 21, -52
+142886026994668, 181226615885678, 74604768684426 @ 254, 156, 358
+242632083944780, 325377174991042, 369509461030046 @ 5, -64, -31
+437035912651352, 252498326441926, 562928520216470 @ -224, 25, -225
+234535071679495, 174981427949087, 261677448496553 @ 240, 272, -175
+290620962742745, 259352652801649, 337506708741698 @ 20, 8, -264
+370765834096665, 330920771305076, 364503409652079 @ -172, -145, -255
+189479107042940, 250724935024242, 383855760393546 @ 55, 27, -24
+66769769721378, 164951301085592, 52536619621894 @ 162, 114, 342
+277670947497460, 176140935580014, 370791351808746 @ 5, 164, -182
+334481227003927, 239981377044292, 154570476022731 @ 92, 211, -221
+234817161058231, 138709258194428, 266737850522698 @ 114, 263, -32
+328708952423036, 157641505054102, 213511104776042 @ -6, 579, -266
+313747174306592, 272562646289128, 166164215907011 @ 111, -109, -27
+334521631655416, 138237118452190, 195327553393202 @ -73, 433, 8
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+307464534531381, 295369849856417, 171462763031194 @ 8, -112, 112
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+325248475515080, 459870300780880, 390739038625760 @ -95, -236, -67
+233150198634180, 251002402106438, 443765524873978 @ 30, 27, -159
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+322577448890609, 206356710517375, 199932751298954 @ -98, 72, 192
+274077567225684, 337971154419414, 413571354785074 @ -39, -73, -63
+334874007081875, 276497990753026, 173077318193639 @ 10, -203, -219
+331757977898368, 269368726421844, 264108295271296 @ -87, -12, -41
+285092233529012, 326692066854086, 137160000413898 @ -56, -55, 255
+259140723374604, 154993084146906, 238798101911134 @ 101, 270, -23
diff --git a/src/day24/sample.txt b/src/day24/sample.txt
new file mode 100644
index 0000000..cbe1492
--- /dev/null
+++ b/src/day24/sample.txt
@@ -0,0 +1,5 @@
+19, 13, 30 @ -2,  1, -2
+18, 19, 22 @ -1, -1, -2
+20, 25, 34 @ -2, -2, -4
+12, 31, 28 @ -1, -2, -1
+20, 19, 15 @  1, -5, -3
\ No newline at end of file