1 files changed, 36 insertions, 0 deletions
diff --git a/src/day8pt1.rs b/src/day8pt1.rs
new file mode 100644
index 0000000..ece5fd9
--- /dev/null
+++ b/src/day8pt1.rs
@@ -0,0 +1,36 @@
+use regex::Regex;
+
+pub fn main() {
+    let txt = std::fs::read_to_string("./input/day8.txt").unwrap();
+    let input = txt.lines().collect::<Vec<_>>();
+
+    let instr = input[0];
+    let graf = (&input[2..input.len()])
+        .into_iter()
+        .map(|s| {
+            let re = Regex::new(r"=\s*|\(|\)|,").unwrap();
+            re.replace_all(s, "")
+                .split_whitespace()
+                .map(String::from)
+                .collect::<Vec<_>>()
+        })
+        .collect::<Vec<_>>();
+
+    let mut cnt: u32 = 0;
+    let mut trn = "AAA";
+    while trn != "ZZZ" {
+        for cvor in &graf {
+            if cvor[0] == trn {
+                if instr.chars().nth(cnt as usize % instr.len()).unwrap() == 'L' {
+                    trn = cvor[1].as_str();
+                } else {
+                    trn = cvor[2].as_str();
+                }
+                cnt += 1;
+                break;
+            }
+        }
+    }
+
+    println!("{}", cnt);
+}