y2015d6p2

y2015/src/bin/d7.rs

@@ -16,5 +16,5 @@ fn part1() {
 fn part2() {
     let root = env!("CARGO_MANIFEST_DIR");
     let content = fs::read_to_string(format!("{root}/resources/7_input.txt")).unwrap();
-    println!("{:#?}", d7::process_part2(&content));
+    println!("{}", d7::process_part2(&content).get("a").unwrap());
 }

y2015/src/days/d7.rs

@@ -9,7 +9,7 @@ pub fn process_part1(input: &str) -> HashMap<String, u16> {
         instructions.insert(wire.to_string(), expression.to_string());
     }
     for wire in instructions.keys() {
-        set_wire(wire.to_owned(), &mut wires, &instructions);
+        set_wire(wire.to_string(), &mut wires, &instructions);
     }
     wires
 }
@@ -39,7 +39,7 @@ fn set_wire(
     if parts.len() == 2 {
         let value = set_wire(parts[1].clone(), wires, instructions);
         wires.insert(wire, !value);
-        return value;
+        return !value;
     }
     if parts.len() == 3 {
         let left = match parts[0].parse::<u16>() {
@@ -81,7 +81,24 @@ fn set_wire(
     panic!("Should not happen");
 }
 
-pub fn process_part2(_input: &str) {}
+pub fn process_part2(input: &str) -> HashMap<String, u16> {
+    let mut wires = HashMap::new();
+    let mut instructions = HashMap::new();
+    for instruction in input.lines() {
+        let (expression, wire) = instruction.split_once(" -> ").unwrap();
+        instructions.insert(wire.to_string(), expression.to_string());
+    }
+    for wire in instructions.keys() {
+        set_wire(wire.to_string(), &mut wires, &instructions);
+    }
+    let new_b = wires.get("a").unwrap();
+    instructions.insert("b".to_string(), new_b.to_string());
+    let mut wires = HashMap::new();
+    for wire in instructions.keys() {
+        set_wire(wire.to_string(), &mut wires, &instructions);
+    }
+    wires
+}
 
 #[cfg(test)]
 mod tests_7 {