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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Advent of Code 2022\n",
+    "#### Day 1: Calorie Counting\n",
+    "\n",
+    "Elves carry various amounts of food with various caloric contents.\n",
+    "\n",
+    "**Part 1.** How many calories is the elf with the most calories of food carrying?\n",
+    "\n",
+    "**Part 2.** How many calories are the three elves with the most calories of food carrying?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "(require racket\n",
+    "         advent-of-code\n",
+    "         threading)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### Part 1\n",
+    "\n",
+    "The data file is a list of integers, one on each line, with an empty line separating the inventory of each elf.\n",
+    "\n",
+    "1. Fetch the input file,\n",
+    "2. split it on double newlines to find each elf's inventory,\n",
+    "3. split each inventory on single newlines,\n",
+    "4. convert each inventory member to a number,\n",
+    "5. sum up each list, and\n",
+    "6. find the maximum one. \n",
+    "\n",
+    "This is straightforward to do with threading/piping:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<code>70374</code>"
+      ],
+      "text/plain": [
+       "70374"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "(define calorie-data (fetch-aoc-input (find-session) 2022 1))\n",
+    "\n",
+    "(~>> calorie-data\n",
+    "    (string-split _ \"\\n\\n\")\n",
+    "    (map (λ~>> string-split (map string->number) (apply +)))\n",
+    "    (apply max))\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### Part 2\n",
+    "\n",
+    "Similarly, to find the top three calorie holders,\n",
+    "\n",
+    "1. fetch the input file,\n",
+    "2. split it on double newlines,\n",
+    "3. split each list member on single newlines,\n",
+    "4. convert each sublist member to a number,\n",
+    "5. sum up each list, \n",
+    "6. sort the list from high to low,\n",
+    "7. take the first three members,\n",
+    "8. and sum them."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<code>204610</code>"
+      ],
+      "text/plain": [
+       "204610"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "(~>> calorie-data\n",
+    "     (string-split _ \"\\n\\n\")\n",
+    "     (map (λ~>> string-split (map string->number) (apply +)))\n",
+    "     (sort _ >)\n",
+    "     (take _ 3)\n",
+    "     (apply +))\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Racket (trusted)",
+   "language": "racket",
+   "name": "racket-trusted"
+  },
+  "language_info": {
+   "codemirror_mode": "scheme",
+   "file_extension": ".rkt",
+   "mimetype": "text/x-racket",
+   "name": "racket",
+   "pygments_lexer": "racket",
+   "version": "8.7"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}