Add D21P1

2019/21/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "d21"
+version = "0.1.0"
+authors = ["kageru <kageru@encode.moe>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+intcode = { path = "../intcode" }

2019/21/src/main.rs

@@ -0,0 +1,21 @@
+use intcode::*;
+
+fn main() {
+    let program = "NOT A J
+NOT B T
+OR T J
+NOT C T
+OR T J
+AND D J
+WALK
+"
+    .chars()
+    .map(|c| c as i64)
+    .rev()
+    .collect();
+    let part1 = IntComputer::new(read_input(), 0, program)
+        .get_all_outputs()
+        .pop()
+        .unwrap();
+    println!("{}", part1);
+}

2019/intcode/src/intcomputer.rs

@@ -128,7 +128,7 @@ impl IntComputer {
                     as usize,
             },
             ['0', '3'] => Operation::Input {
-                value: self.params.pop().unwrap(),
+                value: self.params.pop().expect("Encountered input instruction with empty parameters"),
                 addr: self.get_next_address(get_mode(&full_opcode, ParameterPosition::First))
                     as usize,
             },