From f69f1e8deb000d003917fea82f4e5066a63337f4 Mon Sep 17 00:00:00 2001
From: David Ashby <delta.mu.alpha@gmail.com>
Date: Sat, 7 Dec 2024 14:05:30 -0700
Subject: [PATCH] 574 s on part 2, but it's tractable at least

---
 07/index.ts | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/07/index.ts b/07/index.ts
index 2028b6a..9bd3757 100644
--- a/07/index.ts
+++ b/07/index.ts
@@ -9,8 +9,23 @@ const data = fs.readFileSync(
 );
 
 const doubler = (t: Array<number>, c: number) => [...t, c, c];
+// cut off the triplication if we've already outgrown the target
+const tripler = (total: number) => (t: Array<number>, c: number) =>
+  total < c ? t : [...t, c, c, c];
+
 const permute = (curr: number) => (v: number, i: number) =>
   i % 2 === 0 ? v * curr : v + curr;
+const permuteHarder =
+  (curr: number) =>
+  (v: number, i: number): number => {
+    if (i % 3 === 0) {
+      return v * curr;
+    } else if (i % 3 === 1) {
+      return v + curr;
+    } else {
+      return parseInt(v.toString() + curr.toString(), 10);
+    }
+  };
 
 let timer = now.instant();
 console.log(
@@ -42,6 +57,29 @@ console.log(
 timer = now.instant();
 console.log(
   "part two:",
-  data.split("\n").slice(0, -1),
+  data
+    .split("\n")
+    .slice(0, -1)
+    .reduce((coll, curr) => {
+      // there's probably a cleaner way to do this
+      let [stringtotal, inputs] = curr.split(": ");
+      let total = parseInt(stringtotal, 10);
+      console.log(curr);
+      const res = inputs
+        .split(" ")
+        .map((v) => parseInt(v, 10))
+        .reduce((coll, curr, i) => {
+          if (i === 0) {
+            return [curr];
+          }
+          return coll
+            .reduce(tripler(total), [] as Array<number>)
+            .map(permuteHarder(curr));
+        }, [] as Array<number>);
+      if (res.includes(total)) {
+        return coll + total;
+      }
+      return coll;
+    }, 0),
   printTime(now.instant().since(timer))
 );