1 files changed, 81 insertions, 0 deletions
diff --git a/src/day10pt1.rs b/src/day10pt1.rs
new file mode 100644
index 0000000..52db522
--- /dev/null
+++ b/src/day10pt1.rs
@@ -0,0 +1,81 @@
+fn mogu_levo(c: char) -> bool {
+    return c == 'S' || c == 'L' || c == 'F' || c == '-';
+}
+
+fn mogu_desno(c: char) -> bool {
+    return c == 'S' || c == '7' || c == 'J' || c == '-';
+}
+
+fn mogu_gore(c: char) -> bool {
+    return c == 'S' || c == '7' || c == 'F' || c == '|';
+}
+
+fn mogu_dole(c: char) -> bool {
+    return c == 'S' || c == 'L' || c == 'J' || c == '|';
+}
+
+fn bfs(input: &Vec<&str>, was: &mut Vec<Vec<bool>>, x: i32, y: i32, s: u32) -> u32 {
+    if s > 2 && input[y as usize].chars().nth(x as usize).unwrap() == 'S' {
+        return s;
+    }
+
+    if was[y as usize][x as usize] {
+        return 0;
+    }
+
+    was[y as usize][x as usize] = true;
+
+    for (dx, dy) in [(-1, 0), (1, 0), (0, -1), (0, 1)] {
+        let nx = x + dx;
+        let ny = y + dy;
+        if nx >= 0 && nx < input[y as usize].len() as i32 && ny >= 0 && ny < input.len() as i32 {
+            let t = input[y as usize].chars().nth(x as usize).unwrap();
+            let n = input[ny as usize].chars().nth(nx as usize).unwrap();
+
+            let ind: bool;
+            if dx == 1 {
+                ind = mogu_levo(t) && mogu_desno(n);
+            } else if dx == -1 {
+                ind = mogu_desno(t) && mogu_levo(n);
+            } else if dy == 1 {
+                ind = mogu_gore(t) && mogu_dole(n);
+            } else {
+                ind = mogu_dole(t) && mogu_gore(n);
+            }
+
+            if !ind {
+                continue;
+            }
+
+            let ret = bfs(input, was, nx, ny, s + 1);
+            if ret != 0 {
+                return ret;
+            }
+        }
+    }
+    return 0;
+}
+
+pub fn main() {
+    let txt = std::fs::read_to_string("./input/day10.txt").unwrap();
+    let mut input: Vec<_> = vec![];
+    for line in txt.lines() {
+        input.push(line);
+    }
+
+    let mut x = 0;
+    let mut y = 0;
+
+    for i in 0..input.len() {
+        for j in 0..input[i].len() {
+            if input[i].chars().nth(j).unwrap() == 'S' {
+                x = j as i32;
+                y = i as i32;
+            }
+        }
+    }
+
+    let mut was = vec![vec![false; input[0].len()]; input.len()];
+
+    println!("{}", (bfs(&input, &mut was, x, y, 0) + 1) / 2);
+}