demo and solution of day 14

Author: Mustafa Hanif

Diff for: 2022-13.js

@@ -0,0 +1,46 @@
+const fs = require("fs")
+
+const readData = () => {
+  const data = fs
+    .readFileSync("./input2022-13.txt", "utf-8")
+    .split(/\r?\n\r?\n/)
+    .map(line => line.split(/\r?\n/).map(part => JSON.parse(part)))
+
+  return data
+}
+
+const main = () => {
+  const pairs = readData()
+
+  const compare = ([left, right]) => {
+    if ([left, right].every(Number.isInteger)) {
+      if (left < right) return true
+      if (left > right) return false
+      return
+    }
+
+    if ([left, right].every(Array.isArray)) {
+      for (let i = 0; i < Math.min(left.length, right.length); i++) {
+        const res = compare([left[i], right[i]])
+        if (res != null) return res
+      }
+
+      return compare([left.length, right.length])
+    }
+
+    return compare([[left].flat(), [right].flat()])
+  }
+
+  const dividers = [[[2]], [[6]]]
+
+  const res = [...pairs.flat(), ...dividers]
+    .sort((left, right) => compare([right, left]) - compare([left, right]))
+    .reduce(
+      (acc, el, index) => (dividers.includes(el) ? acc * (index + 1) : acc),
+      1
+    )
+
+  console.log(res)
+}
+
+main()