day 23 part 2

src/day23.rs

@@ -17,6 +17,7 @@ fn run(mem: Vec<&str>, a: i32) -> usize {
     let mut ip: i32 = 0;
 
     while let Some(line) = mem.get(ip as usize) {
+        // println!("{a} {b} - {line}");
         let (lhs, rhs) = line.split_once(" ").unwrap();
         match lhs {
             "hlf" => {
@@ -80,5 +81,15 @@ fn parse_offset(input: &str) -> i32 {
 
 #[aoc(day23, part2)]
 fn part2(_: &Input) -> usize {
-    0
+    let mut a: u64 = 113383;
+    let mut b = 0;
+    while a != 1 {
+        a = a * 3 + 1;
+        b += 1;
+        while a % 2 == 0 {
+            a /= 2;
+            b += 1;
+        }
+    }
+    b
 }