From 2641a35d5473beb6889b299b54de294fbf782b1f Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 7 Jul 2025 11:47:29 +0200
Subject: Day 21 2022

---
 2022/21/common.rs | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 2022/21/common.rs

(limited to '2022/21/common.rs')

diff --git a/2022/21/common.rs b/2022/21/common.rs
new file mode 100644
index 0000000..24dc37b
--- /dev/null
+++ b/2022/21/common.rs
@@ -0,0 +1,51 @@
+#[derive(Debug)]
+pub struct Operation {
+    pub m1: String,
+    pub m2: String,
+    pub op: char
+}
+
+#[derive(Debug)]
+pub enum MonkeyType {
+    Num(i64),
+    Op(Operation)
+}
+
+#[derive(Debug)]
+pub struct Monkey {
+    pub name: String,
+    pub kind: MonkeyType
+}
+
+pub fn read_monkeys_from_stdin() -> Vec<Monkey> {
+    let mut v = vec![];
+    let mut line = String::new();
+    while std::io::stdin().read_line(&mut line).unwrap() > 0 {
+        let name = String::from(&line[0..4]);
+        let monkey = match line.chars().nth(6).unwrap() {
+            '0'..='9' => {
+                let n = line[6..line.len()-1].parse::<i64>().unwrap();
+                Monkey { name, kind: MonkeyType::Num(n) }
+            },
+            _ => {
+                let m1 = String::from(&line[6..10]);
+                let m2 = String::from(&line[13..17]);
+                let op = Operation { m1, m2, op: line.chars().nth(11).unwrap() };
+                Monkey { name, kind: MonkeyType::Op(op) }
+            }
+        };
+        v.push(monkey);
+        line.clear();
+    }
+    v
+}
+
+pub fn apply_op(n1: i64, n2: i64, op: &Operation) -> i64 {
+    match op.op {
+        '+' => n1 + n2,
+        '-' => n1 - n2,
+        '*' => n1 * n2,
+        '/' => n1 / n2,
+        _ => panic!("invalid operator")
+    }
+}
-- 
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