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-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Advent of Code 2022\n",
-    "#### Day 4: Camp Cleanup\n",
-    "\n",
-    "Each elf in a pair of elves is assigned a range of ID numbers.\n",
-    "\n",
-    "**Part 1.** How many pairs have one elf assigned to a range completely contained by the other's?\n",
-    "\n",
-    "**Part 2.** How many pairs have overlapping assignments?\n",
-    "\n",
-    "Since this problem heavily uses ranges, I'm using `rebellion/base/range` to do the heavy lifting."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
-   },
-   "outputs": [],
-   "source": [
-    "#lang iracket/lang #:require rackjure\n",
-    "(require advent-of-code\n",
-    "         relation\n",
-    "         rebellion/base/range)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##### Part 1\n",
-    "\n",
-    "All the assignments look like `\"11-22,33-44\"`, so we write a function to extract the numbers from the string with a regex, decompose the values with structural matching, and construct a pair of [`rebellion` ranges](https://docs.racket-lang.org/rebellion/Ranges.html).\n",
-    "\n",
-    "Once we have the two ranges, we can use a predicate that tests if one completely contains the other or vice versa to count the corresponding assignments."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
-   },
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<code>550</code>"
-      ],
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-       "550"
-      ]
-     },
-     "execution_count": 2,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "(define assignments (~> (fetch-aoc-input (find-session) 2022 4) string-split))\n",
-    "\n",
-    "(define (parse-range str)\n",
-    "  (match str\n",
-    "    [(regexp #px\"(\\\\d+)-(\\\\d+),(\\\\d+)-(\\\\d+)\" (list _ a b c d))\n",
-    "     (values (closed-range (->number a) (->number b)) (closed-range (->number c) (->number d)))]))\n",
-    "\n",
-    "(define (one-encloses-the-other? str)\n",
-    "  (define-values (range1 range2) (parse-range str))\n",
-    "  (or (range-encloses? range1 range2) (range-encloses? range2 range1)))\n",
-    "\n",
-    "(count one-encloses-the-other? assignments)\n"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##### Part 2\n",
-    "\n",
-    "The procedure for part 2 is the same, just using the predicate for overlapping ranges instead."
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 3,
-   "metadata": {
-    "vscode": {
-     "languageId": "racket"
-    }
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-       "<code>931</code>"
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-       "931"
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-     "execution_count": 3,
-     "metadata": {},
-     "output_type": "execute_result"
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-   ],
-   "source": [
-    "(define (one-overlaps-the-other? str)\n",
-    "  (define-values (range1 range2) (parse-range str))\n",
-    "  (range-overlaps? range1 range2))\n",
-    "\n",
-    "(count one-overlaps-the-other? assignments)\n"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Racket (Trusted)",
-   "language": "racket",
-   "name": "racket-trusted"
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