1 files changed, 126 insertions, 0 deletions
diff --git a/2023/day13.rs b/2023/day13.rs
new file mode 100644
index 0000000..b2f2b05
--- /dev/null
+++ b/2023/day13.rs
@@ -0,0 +1,126 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+#![allow(unused_mut)]
+use std::fs::File;
+use std::io::Read;
+
+fn transpose<T>(original: Vec<Vec<T>>) -> Vec<Vec<T>> {
+    assert!(!original.is_empty());
+    let mut transposed = (0..original[0].len()).map(|_| vec![]).collect::<Vec<_>>();
+
+    for original_row in original {
+        for (item, transposed_row) in original_row.into_iter().zip(&mut transposed) {
+            transposed_row.push(item);
+        }
+    }
+    transposed
+}
+
+fn lines_mirrored(arr: &Vec<Vec<bool>>, start: usize) -> bool {
+    for (i, j) in (0..=start).rev().zip(start + 1..arr.len()) {
+        if arr[i] != arr[j] {
+            return false;
+        }
+    }
+    return true;
+}
+
+fn mirror_horizontal_line(arr: &Vec<Vec<bool>>) -> usize {
+    for i in 0..arr.len() - 1 {
+        if lines_mirrored(arr, i) {
+            return i + 1;
+        }
+    }
+    return 0;
+}
+
+fn print_arr(arr: &Vec<Vec<bool>>) {
+    for i in 0..arr.len() {
+        for j in 0..arr[0].len() {
+            if arr[i][j] == true {
+                print!("#");
+            } else {
+                print!(".");
+            }
+        }
+        println!("");
+    }
+    println!("");
+}
+
+fn main() {
+    // let filename = "in/day13.ref";
+    let filename = "in/day13.pzl";
+
+    let mut f = File::open(filename).expect("cannot open file");
+    let mut content = String::new();
+    f.read_to_string(&mut content).expect("cannot read file");
+    let groups = content.trim_end().split("\n\n");
+
+    let mut res1 = 0;
+    let mut res2 = 0;
+
+    for group in groups {
+        let mut arr: Vec<Vec<bool>> = Vec::new();
+        for line in group.split("\n") {
+            let mut l: Vec<bool> = Vec::new();
+            for c in line.chars() {
+                l.push(if c == '#' { true } else { false });
+            }
+            arr.push(l);
+        }
+
+        let (x, y) = (
+            mirror_horizontal_line(&transpose(arr.clone())),
+            mirror_horizontal_line(&arr),
+        );
+        res1 += x + 100 * y;
+        println!("aaa {x} {y}");
+
+        if x != 0 && y != 0 {
+            panic!("asdf");
+        }
+
+        'outer: for i in 0..arr.len() {
+            for j in 0..arr[0].len() {
+                let mut a = arr.clone();
+                a[i][j] ^= true;
+                let (x2, y2) = (
+                    mirror_horizontal_line(&transpose(a.clone())),
+                    mirror_horizontal_line(&a),
+                );
+
+                if x == 0 {
+                    if (y != y2) && (y2 != 0) {
+                        println!("a {x} {y}, {x2} {y2}");
+                        print_arr(&a);
+                        res2 += 100 * y2;
+                        break 'outer;
+                    } else if x2 != 0 {
+                        println!("b {x} {y}, {x2} {y2}");
+                        print_arr(&a);
+                        res2 += x2;
+                        break 'outer;
+                    }
+                }
+
+                if y == 0 {
+                    if y2 != 0 {
+                        println!("c {x} {y}, {x2} {y2}");
+                        print_arr(&a);
+                        res2 += 100 * y2;
+                        break 'outer;
+                    } else if (x != x2) && (x2 != 0) {
+                        println!("d {x} {y}, {x2} {y2}");
+                        print_arr(&a);
+                        res2 += x2;
+                        break 'outer;
+                    }
+                }
+            }
+        }
+    }
+
+    println!("res1: {}", res1);
+    println!("res2: {}", res2);
+}