From ac36ac8d93781e0522990eccec9fd28aed3e0c04 Mon Sep 17 00:00:00 2001
From: Alfred Melch <dev@melch.pro>
Date: Mon, 30 Nov 2020 17:25:40 +0100
Subject: [PATCH] Solve 2019/02

---
 2019/02/example      |  1 +
 2019/02/input        |  1 +
 2019/02/solution1.js | 35 ++++++++++++++++++++++++++++++++++
 2019/02/solution2.js | 45 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 2019/02/example
 create mode 100644 2019/02/input
 create mode 100644 2019/02/solution1.js
 create mode 100644 2019/02/solution2.js

diff --git a/2019/02/example b/2019/02/example
new file mode 100644
index 0000000..2912131
--- /dev/null
+++ b/2019/02/example
@@ -0,0 +1 @@
+1,9,10,3,2,3,11,0,99,30,40,50
diff --git a/2019/02/input b/2019/02/input
new file mode 100644
index 0000000..eed47e9
--- /dev/null
+++ b/2019/02/input
@@ -0,0 +1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,10,19,2,9,19,23,2,23,10,27,1,6,27,31,1,31,6,35,2,35,10,39,1,39,5,43,2,6,43,47,2,47,10,51,1,51,6,55,1,55,6,59,1,9,59,63,1,63,9,67,1,67,6,71,2,71,13,75,1,75,5,79,1,79,9,83,2,6,83,87,1,87,5,91,2,6,91,95,1,95,9,99,2,6,99,103,1,5,103,107,1,6,107,111,1,111,10,115,2,115,13,119,1,119,6,123,1,123,2,127,1,127,5,0,99,2,14,0,0
diff --git a/2019/02/solution1.js b/2019/02/solution1.js
new file mode 100644
index 0000000..97b946f
--- /dev/null
+++ b/2019/02/solution1.js
@@ -0,0 +1,35 @@
+const fs = require("fs");
+
+const inputFileName = "input";
+
+async function main() {
+  const input = await fs.promises.readFile(inputFileName, "utf-8");
+
+  const machine = input.split(",").map((code) => parseInt(code));
+  machine[1] = 12;
+  machine[2] = 2;
+  console.log(machine);
+
+  let curIdx = 0;
+  let opCode = machine[curIdx];
+  while (opCode !== 99) {
+    const val1 = machine[machine[curIdx + 1]];
+    const val2 = machine[machine[curIdx + 2]];
+    const register = machine[curIdx + 3];
+    console.log(opCode, val1, val2, register);
+    if (opCode === 1) {
+      machine[register] = val1 + val2;
+    } else if (opCode === 2) {
+      machine[register] = val1 * val2;
+    } else {
+      throw Error("invalid opcode");
+    }
+
+    curIdx += 4;
+    opCode = machine[curIdx];
+  }
+  console.log(machine);
+  console.log(machine[0]);
+}
+
+main();
diff --git a/2019/02/solution2.js b/2019/02/solution2.js
new file mode 100644
index 0000000..64d84ca
--- /dev/null
+++ b/2019/02/solution2.js
@@ -0,0 +1,45 @@
+const fs = require("fs");
+
+const inputFileName = "input";
+
+async function main() {
+  const input = await fs.promises.readFile(inputFileName, "utf-8");
+
+  const machine = input.split(",").map((code) => parseInt(code));
+  machine[1] = 12;
+  machine[2] = 2;
+
+  for (let noun = 0; noun < 100; noun++) {
+    for (let verb = 0; verb < 100; verb++) {
+      machine[1] = noun;
+      machine[2] = verb;
+      if (intMachine(machine.slice()) == 19690720) {
+        console.log(100 * noun + verb);
+        process.exit();
+      }
+    }
+  }
+}
+
+function intMachine(machine) {
+  let curIdx = 0;
+  let opCode = machine[curIdx];
+  while (opCode !== 99) {
+    const val1 = machine[machine[curIdx + 1]];
+    const val2 = machine[machine[curIdx + 2]];
+    const register = machine[curIdx + 3];
+    if (opCode === 1) {
+      machine[register] = val1 + val2;
+    } else if (opCode === 2) {
+      machine[register] = val1 * val2;
+    } else {
+      throw Error("invalid opcode");
+    }
+
+    curIdx += 4;
+    opCode = machine[curIdx];
+  }
+  return machine[0];
+}
+
+main();