diff --git a/src/day15/1.rs b/src/day15/1.rs
index e69de29..867b901 100644
--- a/src/day15/1.rs
+++ b/src/day15/1.rs
@@ -0,0 +1,105 @@
+#![feature(test)]
+
+use std::collections::HashSet;
+
+extern crate test;
+
+const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+
+#[derive(Debug)]
+struct Sensor {
+    sx: i32,
+    sy: i32,
+    bx: i32,
+    by: i32,
+}
+
+fn parse(input: &str) -> Vec<Sensor> {
+    input
+        .lines()
+        .filter(|c| !c.is_empty())
+        .filter_map(|line| {
+            line.split_once(':').map(|(sensor, beacon)| {
+                let (sx, sy) = sensor
+                    .split_once(',')
+                    .map(|(x, y)| {
+                        let xneg = x.contains('-');
+                        let yneg = y.contains('-');
+                        let x = x
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i32);
+                        let y = y
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i32);
+
+                        (if xneg { -x } else { x }, if yneg { -y } else { y })
+                    })
+                    .unwrap();
+                let (bx, by) = beacon
+                    .split_once(',')
+                    .map(|(x, y)| {
+                        let xneg = x.contains('-');
+                        let yneg = y.contains('-');
+                        let x = x
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i32);
+                        let y = y
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i32);
+
+                        (if xneg { -x } else { x }, if yneg { -y } else { y })
+                    })
+                    .unwrap();
+                Sensor { sx, sy, bx, by }
+            })
+        })
+        .collect()
+}
+
+fn solution(mut input: Vec<Sensor>, line: i32) -> usize {
+    let mut beacons = HashSet::new();
+    let mut set = HashSet::new();
+
+    input.sort_unstable_by_key(|c| c.sx);
+
+    for Sensor { sx, sy, bx, by } in input {
+        if by == line {
+            beacons.insert(bx);
+        }
+
+        let area = (bx - sx).abs() + (by - sy).abs();
+        for ix in sx - area..=sx + area {
+            if inside((sx, sy), (ix, line)) <= area {
+                set.insert(ix);
+            };
+        }
+    }
+
+    set.len() - beacons.len()
+}
+
+#[inline]
+const fn inside((sx, sy): (i32, i32), (px, py): (i32, i32)) -> i32 {
+    (sx - px).abs() + (sy - py).abs()
+}
+
+fn main() {
+    let output = parse(INPUTS[0]);
+    let score = solution(output, 10);
+    println!("{}", score);
+    let output = parse(INPUTS[1]);
+    let score = solution(output, 2000000);
+    println!("{}", score);
+}
+#[bench]
+fn solution_bench(b: &mut test::Bencher) {
+    b.iter(|| {
+        let input = parse(INPUTS[1]);
+        let result = solution(input, 2000000);
+        test::black_box(result);
+    })
+}
diff --git a/src/day15/2.rs b/src/day15/2.rs
index e69de29..cca491b 100644
--- a/src/day15/2.rs
+++ b/src/day15/2.rs
@@ -0,0 +1,106 @@
+#![feature(test)]
+extern crate test;
+
+const INPUTS: [&str; 2] = [include_str!("./sample.txt"), include_str!("./input.txt")];
+
+#[derive(Debug)]
+struct Sensor {
+    sx: i64,
+    sy: i64,
+
+    area: i64,
+}
+
+fn parse(input: &str) -> Vec<Sensor> {
+    input
+        .lines()
+        .filter(|c| !c.is_empty())
+        .filter_map(|line| {
+            line.split_once(':').map(|(sensor, beacon)| {
+                let (sx, sy) = sensor
+                    .split_once(',')
+                    .map(|(x, y)| {
+                        let xneg = x.contains('-');
+                        let yneg = y.contains('-');
+                        let x = x
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i64);
+                        let y = y
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i64);
+
+                        (if xneg { -x } else { x }, if yneg { -y } else { y })
+                    })
+                    .unwrap();
+                let (bx, by) = beacon
+                    .split_once(',')
+                    .map(|(x, y)| {
+                        let xneg = x.contains('-');
+                        let yneg = y.contains('-');
+                        let x = x
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i64);
+                        let y = y
+                            .bytes()
+                            .filter(|c| (b'0'..=b'9').contains(c))
+                            .fold(0, |a, x| (a * 10) + (x - b'0') as i64);
+
+                        (if xneg { -x } else { x }, if yneg { -y } else { y })
+                    })
+                    .unwrap();
+                Sensor {
+                    sx,
+                    sy,
+                    area: (sx - bx).abs() + (sy - by).abs(),
+                }
+            })
+        })
+        .collect()
+}
+
+fn solution(input: Vec<Sensor>, line: i64) -> i64 {
+    for j in 0..=line {
+        let mut i = 0;
+
+        'out: while i <= line {
+            for beacon in input.iter() {
+                if inside((beacon.sx, beacon.sy), (i, j)) <= beacon.area {
+                    let dy = (j - beacon.sy).abs();
+                    let dx = (beacon.sx - i) + (beacon.area - dy) + 1;
+                    i += dx;
+
+                    continue 'out;
+                }
+            }
+
+            return i * 4000000 + j;
+        }
+    }
+
+    0
+}
+
+#[inline]
+const fn inside((sx, sy): (i64, i64), (px, py): (i64, i64)) -> i64 {
+    (sx - px).abs() + (sy - py).abs()
+}
+
+fn main() {
+    let output = parse(INPUTS[0]);
+    let score = solution(output, 20);
+    println!("{}", score);
+    let output = parse(INPUTS[1]);
+    let score = solution(output, 4000000);
+    println!("{}", score);
+}
+#[bench]
+fn solution_bench(b: &mut test::Bencher) {
+    b.iter(|| {
+        let input = parse(INPUTS[1]);
+        let result = solution(input, 4000000);
+        test::black_box(result);
+    })
+}
diff --git a/src/day15/input.txt b/src/day15/input.txt
new file mode 100644
index 0000000..d7ba5ed
--- /dev/null
+++ b/src/day15/input.txt
@@ -0,0 +1,38 @@
+Sensor at x=220580, y=684270: closest beacon is at x=436611, y=263737
+Sensor at x=3329538, y=3016377: closest beacon is at x=3355914, y=2862466
+Sensor at x=2605308, y=2023938: closest beacon is at x=2197530, y=2271330
+Sensor at x=1810202, y=3423309: closest beacon is at x=1829362, y=3182862
+Sensor at x=480296, y=3999646: closest beacon is at x=1694700, y=4178942
+Sensor at x=46556, y=1283362: closest beacon is at x=-91140, y=1441882
+Sensor at x=3741660, y=3959257: closest beacon is at x=3537901, y=3368697
+Sensor at x=3399994, y=700264: closest beacon is at x=3748004, y=2000000
+Sensor at x=1531981, y=3801761: closest beacon is at x=1694700, y=4178942
+Sensor at x=193367, y=2712458: closest beacon is at x=-91140, y=1441882
+Sensor at x=3199067, y=2194575: closest beacon is at x=3748004, y=2000000
+Sensor at x=1878117, y=2578817: closest beacon is at x=2197530, y=2271330
+Sensor at x=2439089, y=3168242: closest beacon is at x=1829362, y=3182862
+Sensor at x=273443, y=171076: closest beacon is at x=436611, y=263737
+Sensor at x=3680413, y=2477027: closest beacon is at x=3748004, y=2000000
+Sensor at x=3620241, y=2904998: closest beacon is at x=3355914, y=2862466
+Sensor at x=1728351, y=2895399: closest beacon is at x=1829362, y=3182862
+Sensor at x=1894207, y=1168355: closest beacon is at x=2197530, y=2271330
+Sensor at x=856867, y=3271314: closest beacon is at x=1829362, y=3182862
+Sensor at x=3056788, y=2626224: closest beacon is at x=3355914, y=2862466
+Sensor at x=3598024, y=3322247: closest beacon is at x=3537901, y=3368697
+Sensor at x=1662543, y=3128823: closest beacon is at x=1829362, y=3182862
+Sensor at x=3992558, y=1933059: closest beacon is at x=3748004, y=2000000
+Sensor at x=1844282, y=2994285: closest beacon is at x=1829362, y=3182862
+Sensor at x=3604375, y=3668021: closest beacon is at x=3537901, y=3368697
+Sensor at x=2569893, y=3911832: closest beacon is at x=1694700, y=4178942
+Sensor at x=117970, y=37503: closest beacon is at x=436611, y=263737
+Sensor at x=3951385, y=3125577: closest beacon is at x=3537901, y=3368697
+Sensor at x=2482373, y=2648092: closest beacon is at x=2197530, y=2271330
+Sensor at x=915040, y=1835970: closest beacon is at x=-91140, y=1441882
+Sensor at x=3047883, y=3301452: closest beacon is at x=3537901, y=3368697
+Sensor at x=117432, y=1503889: closest beacon is at x=-91140, y=1441882
+Sensor at x=1136011, y=261705: closest beacon is at x=436611, y=263737
+Sensor at x=2343111, y=66183: closest beacon is at x=2081841, y=-807749
+Sensor at x=608229, y=955721: closest beacon is at x=436611, y=263737
+Sensor at x=1189379, y=3999750: closest beacon is at x=1694700, y=4178942
+Sensor at x=766640, y=26597: closest beacon is at x=436611, y=263737
+Sensor at x=3891093, y=2110588: closest beacon is at x=3748004, y=2000000
diff --git a/src/day15/sample.txt b/src/day15/sample.txt
new file mode 100644
index 0000000..a612424
--- /dev/null
+++ b/src/day15/sample.txt
@@ -0,0 +1,14 @@
+Sensor at x=2, y=18: closest beacon is at x=-2, y=15
+Sensor at x=9, y=16: closest beacon is at x=10, y=16
+Sensor at x=13, y=2: closest beacon is at x=15, y=3
+Sensor at x=12, y=14: closest beacon is at x=10, y=16
+Sensor at x=10, y=20: closest beacon is at x=10, y=16
+Sensor at x=14, y=17: closest beacon is at x=10, y=16
+Sensor at x=8, y=7: closest beacon is at x=2, y=10
+Sensor at x=2, y=0: closest beacon is at x=2, y=10
+Sensor at x=0, y=11: closest beacon is at x=2, y=10
+Sensor at x=20, y=14: closest beacon is at x=25, y=17
+Sensor at x=17, y=20: closest beacon is at x=21, y=22
+Sensor at x=16, y=7: closest beacon is at x=15, y=3
+Sensor at x=14, y=3: closest beacon is at x=15, y=3
+Sensor at x=20, y=1: closest beacon is at x=15, y=3