1 files changed, 83 insertions, 0 deletions
diff --git a/2015/puzzle-6.js b/2015/puzzle-6.js
new file mode 100644
index 0000000..62c0382
--- /dev/null
+++ b/2015/puzzle-6.js
@@ -0,0 +1,83 @@
+const fs = require('node:fs/promises');
+
+let arr = []
+
+function count_1() {
+  return arr.filter(x => x).length;
+}
+
+function count_2() {
+  return arr.reduce((x, y) => x + y);
+}
+
+async function read_file() {
+  const data = await fs.readFile("6-input", {encoding: 'utf8'});
+  return data;
+}
+
+function parse_line(line) {
+  let [type, ...rest] = line.split(" ")
+  let obj = {type: "", bottom: [], top: []};
+  if (type === "toggle") {
+    obj.type = "toggle";
+  } else {
+    obj.type = rest[0];
+    rest = rest.slice(1);
+  }
+  obj.bottom = rest[0].split(",").map(x => parseInt(x));
+  obj.top = rest[2].split(",").map(x => parseInt(x));
+  return obj
+}
+
+function execute_inst_1(inst) {
+  for (let i = inst.bottom[0]; i <= inst.top[0]; ++i) {
+    for (let j = inst.bottom[1]; j <= inst.top[1]; ++j) {
+      if (inst.type === "on") {
+        arr[(i * 1000) + j] = true;
+      } else if (inst.type === "off") {
+        arr[(i * 1000) + j] = false;
+      } else {
+        arr[(i * 1000) + j] = !arr[(i * 1000) + j];
+      }
+    }
+  }
+}
+
+function execute_inst_2(inst) {
+  for (let i = inst.bottom[0]; i <= inst.top[0]; ++i) {
+    for (let j = inst.bottom[1]; j <= inst.top[1]; ++j) {
+      if (inst.type === "on") {
+        arr[(i * 1000) + j] += 1;
+      } else if (inst.type === "off") {
+        arr[(i * 1000) + j] = Math.max(0, arr[(i * 1000) + j] - 1);
+      } else {
+        arr[(i * 1000) + j] += 2;
+      }
+    }
+  }
+}
+
+(async () => {
+  let lines = (await read_file()).split(/\n/);
+  const insts = lines.map(parse_line);
+
+  for (let i = 0; i < 1000000; ++i) {
+    arr.push(false);
+  }
+  for (let i = 0; i < insts.length; ++i) {
+    execute_inst_1(insts[i]);
+  }
+  console.log("Round 1:", count_1());
+
+  for (let i = 0; i < 1000000; ++i) {
+    arr[i] = 0;
+  }
+  for (let i = 0; i < insts.length; ++i) {
+    execute_inst_2(insts[i]);
+  }
+  console.log("Round 2:", count_2());
+})()
+
+// Local Variables:
+// compile-command: "node puzzle-6.js"
+// End: