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-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Advent of Code 2022\n",
-    "#### Day 3: Rucksack Reorganization\n",
-    "\n",
-    "**Part 1.** Every elf has a rucksack with two compartments.  What's the total priority value of the items that appear in both compartments of each sack?\n",
-    "\n",
-    "**Part 2.** Each group of three elves is carrying exactly one item in common.  What's the total priority value of those common items?\n",
-    "\n",
-    "To ease the conversion between strings, lists and sets I bring in some utility functions from `relation`. "
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
-   },
-   "outputs": [],
-   "source": [
-    "(require racket\n",
-    "         advent-of-code\n",
-    "         threading\n",
-    "         (only-in relation ->list ->set ->char))\n"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "The items in each elf's inventory are represented by a string of alphabetic (case-sensitive) characters, each with a \"priority value\":\n",
-    "* Lowercase item types `a` through `z` have priorities 1 through 26.\n",
-    "* Uppercase item types `A` through `Z` have priorities 27 through 52."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
-   },
-   "outputs": [],
-   "source": [
-    "(define priority\n",
-    "  (for/hash ([i (in-naturals 1)]\n",
-    "             [c (in-sequences (inclusive-range 97 122) (inclusive-range 65 90))])\n",
-    "    (values (->char c) i)))"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##### Part 1\n",
-    "\n",
-    "The front half and back half of the rucksack have one item in common we need to identify.  For each rucksack in the inventory, we apply the following steps:\n",
-    "\n",
-    "1. Split the bag into the two halves,\n",
-    "2. find the common item in both halves (the intersection of the sets),\n",
-    "3. then look up that common item's value. "
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 3,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<code>7845</code>"
-      ],
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-       "7845"
-      ]
-     },
-     "execution_count": 3,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "(define raw-inventory (~> (fetch-aoc-input (find-session) 2022 3) string-split))\n",
-    "\n",
-    "(for/sum ([bag (in-list raw-inventory)])\n",
-    "         (define len (/ (string-length bag) 2))\n",
-    "         (~>> bag\n",
-    "              ->list\n",
-    "              ((λ (xs) (list (take xs len) (drop xs len)))) ; step 1\n",
-    "              (apply set-intersect _) ; step 2\n",
-    "              set-first\n",
-    "              (hash-ref priority))) ; step 3\n"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##### Part 2\n",
-    "\n",
-    "Now we need to take three rucksacks at a time and find the common item they all share.  The procedure is simpler than Part 1's, especially with the `in-slice` function that automatically forms groups of three."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 4,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
-   },
-   "outputs": [
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-     "data": {
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-       "<code>2790</code>"
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-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "(for/sum ([bags (in-slice 3 raw-inventory)])\n",
-    "         (~>> bags (map ->set) (apply set-intersect) set-first (hash-ref priority)))\n"
-   ]
-  }
- ],
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-   "language": "racket",
-   "name": "racket-trusted"
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-   "file_extension": ".rkt",
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