1 files changed, 19 insertions, 0 deletions

diff --git a/2022/21/a.rs b/2022/21/a.rs
new file mode 100644
index 0000000..297f97a
--- /dev/null
+++ b/2022/21/a.rs
@@ -0,0 +1,19 @@
+mod common;
+use common::*;
+
+pub fn calculate(name: &str, monkeys: &Vec<Monkey>) -> i64 {
+    let i = monkeys.iter().position(|m| m.name == name).unwrap();
+    match &monkeys[i].kind {
+        MonkeyType::Num(n) => *n,
+        MonkeyType::Op(op) => {
+            let n1 = calculate(&op.m1, &monkeys);
+            let n2 = calculate(&op.m2, &monkeys);
+            apply_op(n1, n2, op)
+        }
+    }
+}
+
+fn main() {
+    let monkeys = read_monkeys_from_stdin();
+    println!("{}", calculate(&"root", &monkeys));
+}