diff --git a/2022/rust/Cargo.toml b/2022/rust/Cargo.toml
index 0416b00..7fd4c18 100644
--- a/2022/rust/Cargo.toml
+++ b/2022/rust/Cargo.toml
@@ -42,4 +42,8 @@ path = "src/day6.rs"
 name = "day7"
 path = "src/day7.rs"
 
+[[bin]]
+name = "day8"
+path = "src/day8.rs"
+
 [dependencies]
diff --git a/2022/rust/src/day8.rs b/2022/rust/src/day8.rs
new file mode 100644
index 0000000..eddc104
--- /dev/null
+++ b/2022/rust/src/day8.rs
@@ -0,0 +1,113 @@
+mod common;
+
+use std::collections::HashSet;
+
+type Input = Vec<Vec<u8>>;
+type Result = usize;
+
+fn processed_input(input: &str) -> Input {
+    let mut result = vec![];
+    for l in input.lines() {
+        let mut v = vec![];
+        for b in l.bytes() {
+            v.push(b - 48);
+        }
+        result.push(v);
+    }
+    return result;
+}
+
+fn part1(input: &Input) -> Result {
+    let mut trees: HashSet<(usize, usize)> = HashSet::new();
+    let mut add = |y, x| {
+        println!(
+            "tree @ row {}, col {} ({})",
+            y,
+            x,
+            (&input[y] as &Vec<u8>)[x]
+        );
+        trees.insert((y, x));
+    };
+    let h = input.len();
+    let w = input[0].len();
+    for y in 0..h {
+        let row = &input[y];
+        let mut tallest_left = row[0];
+        let mut tallest_right = row[w - 1];
+        let mut xd = 1;
+        add(y, 0);
+        add(y, w - 1);
+        while xd < w {
+            if row[xd] > tallest_left {
+                tallest_left = row[xd];
+                add(y, xd);
+            }
+            let rx = w - 1 - xd;
+            if row[rx] > tallest_right {
+                tallest_right = row[rx];
+                add(y, rx);
+            }
+            xd += 1;
+        }
+    }
+
+    for x in 0..w {
+        let mut tallest_top = input[0][x];
+        let mut tallest_bottom = input[h - 1][x];
+        let mut yd = 1;
+        add(0, x);
+        add(h - 1, x);
+        while yd < h {
+            if input[yd][x] > tallest_top {
+                tallest_top = input[yd][x];
+                add(yd, x);
+            }
+            let ry = h - 1 - yd;
+            if input[yd][ry] > tallest_bottom {
+                tallest_bottom = input[yd][ry];
+                add(ry, x);
+            }
+            yd += 1;
+        }
+    }
+
+    println!("{:?}", trees);
+
+    trees.len()
+}
+
+fn part2(input: &Input) -> Result {
+    0
+}
+
+fn main() {
+    let input_text = common::day_input(8);
+    eprintln!("{}\n\nAbove is your input file.\n\n", input_text);
+    let input = processed_input(&input_text);
+    common::show_answers(&part1(&input), &part2(&input))
+    // 1755 for part 1 is too high
+    // common::show_both_answers(&both_parts(&input))
+}
+
+// fn both_parts(input: &Input) -> (Result, Result) {
+//     (0, 0)
+// }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const TEST_INPUT: &str = "30373
+25512
+65332
+33549
+35390";
+
+    #[test]
+    fn test() {
+        let input = processed_input(TEST_INPUT);
+        assert_eq!(part1(&input), 21);
+        assert_eq!(part2(&input), 0);
+        // assert_eq!(both_parts(&input), (0, 0));
+    }
+}