{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import aocd\n",
    "\n",
    "data = aocd.get_data(day=5, year=2017)\n",
    "instructions = list(map(int, data.splitlines()))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "def execute(instructions, decrement_at_3=False):\n",
    "    pos = 0\n",
    "    steps = 0\n",
    "    while 0 <= pos < len(instructions):\n",
    "        delta = instructions[pos]\n",
    "        if (not decrement_at_3) or delta < 3:\n",
    "            instructions[pos] += 1\n",
    "        else:\n",
    "            instructions[pos] -= 1\n",
    "        pos += delta\n",
    "        steps += 1\n",
    "    return steps"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Part 1: 372671\n"
     ]
    }
   ],
   "source": [
    "assert execute([0, 3, 0, 1, -3]) == 5\n",
    "print(\"Part 1:\", execute(instructions[:]))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Part 2: 25608480\n"
     ]
    }
   ],
   "source": [
    "assert execute([0, 3, 0, 1, -3], True) == 10\n",
    "print(\"Part 2:\", execute(instructions[:], True))"
   ]
  }
 ],
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  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
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  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.12.0"
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 "nbformat": 4,
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