commit e6cceca88c1263ad417af32ec2030b358b1155e7
Author: hal8174 <henning.lindemann@pm.me>
Date:   Tue Dec 10 18:21:07 2024 +0100

    Initial commit

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e44f056
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "stamp-folding"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+image = "0.25.5"
diff --git a/src/bin/image.rs b/src/bin/image.rs
new file mode 100644
index 0000000..a5b5cfc
--- /dev/null
+++ b/src/bin/image.rs
@@ -0,0 +1,13 @@
+use image::GrayImage;
+use stamp_folding::image::{draw_image, image_dimensions};
+
+fn main() {
+    let data = [0, 1, 2, 3];
+    let (width, height) = image_dimensions(data.len());
+
+    let mut img = GrayImage::new(width, height);
+
+    draw_image(&mut img, &data);
+
+    img.save("img.png").unwrap();
+}
diff --git a/src/bin/overflow_check.rs b/src/bin/overflow_check.rs
new file mode 100644
index 0000000..6f21f8f
--- /dev/null
+++ b/src/bin/overflow_check.rs
@@ -0,0 +1,10 @@
+fn main() {
+    let mut i = 1;
+    let mut f = 1u128;
+    while let Some(nf) = f.checked_mul(i) {
+        f = nf;
+        i += 1;
+    }
+
+    println!("{}: {f}", i - 1);
+}
diff --git a/src/bin/series.rs b/src/bin/series.rs
new file mode 100644
index 0000000..86ec57a
--- /dev/null
+++ b/src/bin/series.rs
@@ -0,0 +1,10 @@
+use stamp_folding::stamp_folding;
+
+fn main() {
+    for length in 2.. {
+        let mut count = 0;
+        let mut state = vec![0, 1];
+        stamp_folding(&mut state, 1, length - 2, &mut count, &mut |_, _| {});
+        println!("{length:02}: {count} {}", count * 2);
+    }
+}
diff --git a/src/bin/single_stamp.rs b/src/bin/single_stamp.rs
new file mode 100644
index 0000000..16a2ae3
--- /dev/null
+++ b/src/bin/single_stamp.rs
@@ -0,0 +1,8 @@
+use stamp_folding::stamp_folding;
+
+fn main() {
+    let length = 4;
+    let mut count = 0;
+    let mut state = vec![0, 1];
+    stamp_folding(&mut state, 1, length - 2, &mut count, &mut |_, _| {});
+}
diff --git a/src/bin/stamp_folding_images.rs b/src/bin/stamp_folding_images.rs
new file mode 100644
index 0000000..22ce5c2
--- /dev/null
+++ b/src/bin/stamp_folding_images.rs
@@ -0,0 +1,37 @@
+use image::{GenericImage, GrayImage};
+use stamp_folding::{
+    image::{draw_image, image_dimensions},
+    stamp_folding,
+};
+
+fn main() {
+    for length in 2..12 {
+        let mut count = 0;
+        let mut state = vec![0, 1];
+        stamp_folding(&mut state, 1, length - 2, &mut count, &mut |_, _| {});
+
+        let (width, height) = image_dimensions(length as usize);
+        dbg!(width, height);
+        let columns = count.isqrt() as u32;
+
+        let mut image = GrayImage::new(
+            width * columns,
+            height * count.div_ceil(columns as u128) as u32,
+        );
+
+        let mut count = 0;
+        let mut state = vec![0, 1];
+        stamp_folding(&mut state, 1, length - 2, &mut count, &mut |i, l| {
+            let mut subimage = image.sub_image(
+                width * (i as u32 % columns),
+                height * (i as u32 / columns),
+                width,
+                height,
+            );
+
+            draw_image(&mut *subimage, l);
+        });
+
+        image.save(format!("img{length:02}.png")).unwrap();
+    }
+}
diff --git a/src/image.rs b/src/image.rs
new file mode 100644
index 0000000..90e52f8
--- /dev/null
+++ b/src/image.rs
@@ -0,0 +1,66 @@
+use image::{GenericImage, Luma};
+
+const CENTRAL_WIDTH: u32 = 5;
+
+pub fn draw_image(image: &mut impl GenericImage<Pixel = Luma<u8>>, layout: &[u8]) {
+    let side_width = layout.len() as u32 + 1;
+
+    let white = Luma::from([255]);
+    let grey = Luma::from([125]);
+
+    for (i, &s) in layout.iter().enumerate() {
+        for j in 0..CENTRAL_WIDTH {
+            image.put_pixel(
+                side_width + j,
+                1 + i as u32 * 3,
+                if s == 0 { grey } else { white },
+            );
+        }
+
+        if let Some(j) = layout.iter().position(|&c| c == s + 1) {
+            if s % 2 == 0 {
+                let lower = usize::min(i, j) as u32;
+                let upper = usize::max(i, j) as u32;
+
+                let diff = upper - lower;
+
+                let depth = diff;
+
+                for d in 0..depth {
+                    image.put_pixel(side_width + CENTRAL_WIDTH + d, 1 + lower * 3 + d + 1, white);
+                    image.put_pixel(side_width + CENTRAL_WIDTH + d, 1 + upper * 3 - d - 1, white);
+                }
+
+                let l = 1 + lower * 3 + depth + 1;
+                let u = 1 + upper * 3 - depth - 1;
+
+                for y in l..=u {
+                    image.put_pixel(side_width + CENTRAL_WIDTH + depth, y, white);
+                }
+            } else {
+                let lower = usize::min(i, j) as u32;
+                let upper = usize::max(i, j) as u32;
+
+                let diff = upper - lower;
+
+                let depth = diff;
+
+                for d in 0..depth {
+                    image.put_pixel(side_width - d - 1, 1 + lower * 3 + d + 1, white);
+                    image.put_pixel(side_width - d - 1, 1 + upper * 3 - d - 1, white);
+                }
+
+                let l = 1 + lower * 3 + depth + 1;
+                let u = 1 + upper * 3 - depth - 1;
+
+                for y in l..=u {
+                    image.put_pixel(side_width - depth - 1, y, white);
+                }
+            }
+        }
+    }
+}
+
+pub fn image_dimensions(len: usize) -> (u32, u32) {
+    (CENTRAL_WIDTH + 2 * len as u32 + 2, 3 * len as u32)
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..2a848c2
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,74 @@
+pub mod image;
+
+pub fn stamp_folding(
+    current: &mut Vec<u8>,
+    last_inserted_index: usize,
+    remaining: u8,
+    count: &mut u128,
+    callback: &mut impl FnMut(u128, &[u8]),
+) {
+    let depth = current.len() as u8;
+    // dbg!(&current, depth, last_inserted_index);
+    if remaining == 0 {
+        callback(*count, current);
+        *count = count.checked_add(1).unwrap();
+        return;
+    }
+
+    let last_inserted_value = current[last_inserted_index];
+
+    let mut last = None;
+    for i in (0..last_inserted_index).rev() {
+        // dbg!(&last, &current, i);
+        if let Some(l) = last {
+            let next = if l % 2 == last_inserted_value % 2 {
+                l + 1
+            } else {
+                l - 1
+            };
+            if current[i] == next {
+                last = None;
+            }
+        } else {
+            current.insert(i + 1, depth);
+            stamp_folding(current, i + 1, remaining - 1, count, callback);
+            current.remove(i + 1);
+            if current[i] != 0 || last_inserted_value % 2 == 0 {
+                last = Some(current[i]);
+            }
+        }
+    }
+
+    if last.is_none() {
+        current.insert(0, depth);
+        stamp_folding(current, 0, remaining - 1, count, callback);
+        current.remove(0);
+    }
+
+    let mut last = None;
+    for i in (last_inserted_index + 1)..current.len() {
+        if let Some(l) = last {
+            let next = if l % 2 == last_inserted_value % 2 {
+                l + 1
+            } else {
+                l - 1
+            };
+            if current[i] == next {
+                last = None;
+            }
+        } else {
+            current.insert(i, depth);
+            stamp_folding(current, i, remaining - 1, count, callback);
+            current.remove(i);
+            if current[i] != 0 || last_inserted_value % 2 == 0 {
+                last = Some(current[i]);
+            }
+        }
+    }
+
+    if last.is_none() {
+        current.push(depth);
+        stamp_folding(current, current.len() - 1, remaining - 1, count, callback);
+        current.pop();
+    }
+}