Day 7, puzzle 1

src/bin/d7p1.rs

@@ -0,0 +1,20 @@
+use aoc22::{day7, util};
+
+const MAX_SIZE: usize = 100000;
+
+pub fn main() {
+    let root = day7::parse_cmdline(&util::parse_input());
+
+    let mut total_size = 0;
+    for child in root.borrow().all_children() {
+        let c = &*child.borrow();
+        if let day7::Node::Dir { .. } = c {
+            let size = c.size();
+            if size <= MAX_SIZE {
+                total_size += size;
+            }
+        }
+    }
+
+    println!("Total size of small directories: {}", total_size);
+}