I'm confused

3 files changed, 51 insertions, 0 deletions

diff --git a/2020/23/Makefile b/2020/23/Makefile
new file mode 100644
index 0000000..dad052e
--- /dev/null
+++ b/2020/23/Makefile
@@ -0,0 +1,2 @@
+run:
+	@node solve.js
diff --git a/2020/23/input b/2020/23/input
new file mode 100644
index 0000000..ab40847
--- /dev/null
+++ b/2020/23/input
@@ -0,0 +1 @@
+389125467
diff --git a/2020/23/solve.js b/2020/23/solve.js
new file mode 100644
index 0000000..f16443b
--- /dev/null
+++ b/2020/23/solve.js
@@ -0,0 +1,48 @@
+const { _, performance } = require("perf_hooks");
+const fs = require("fs");
+const data = fs
+  .readFileSync("input", "utf8")
+  .split("\n")[0]
+  .split("")
+  .map((x) => parseInt(x));
+
+function partOne() {
+  let moves = 11;
+
+  let cur = 0;
+  const cups = data;
+  while (--moves) {
+    // Pick up
+    const picks = [];
+    for (let i = 0; i < 3; i++) picks[i] = cups.splice(cur + 1, 1);
+
+    // Find destination
+    let dest = 0;
+    let decr = 1;
+    while (!dest) {
+      dest = cups.filter((x) => x == cups[cur] - decr)[0];
+      if (!dest) decr++;
+
+      if (decr > cups.length) {
+        dest = Math.max.apply(Math, cups);
+        break;
+      }
+    }
+
+    cups.splice.apply(cups, [cups.indexOf(dest) + 1, 0].concat(picks));
+    console.log("Cups: " + cups, "Picks: " + picks, "Dest: " + dest);
+
+    cur++;
+  }
+  return 0;
+}
+
+function partTwo() {
+  return 0;
+}
+
+const tic = performance.now();
+console.log(partOne());
+console.log(partTwo());
+const toc = performance.now();
+console.log("TIME: " + ((toc - tic) / 1000).toFixed(6) + " seconds");