{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [],
   "source": [
    "def enflip(items, flips, burnt=False, debug=False):\n",
    "    if debug: i0 = items\n",
    "    for flip in flips:\n",
    "        if burnt:\n",
    "            items = [-i for i in reversed(items[:flip])] + items[flip:]\n",
    "        else:\n",
    "            items = [i for i in reversed(items[:flip])] + items[flip:]\n",
    "        if debug: print('{} -{}-> {}'.format(i0, flip, items))\n",
    "        if debug: i0 = items\n",
    "    return items"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [],
   "source": [
    "def burnt_sorted(pancakes):\n",
    "    return all(p > 0 for p in pancakes) and pancakes == sorted(pancakes)\n",
    "\n",
    "def unburnt_sorted(pancakes):\n",
    "    simple_pancakes = [abs(p) for p in pancakes]\n",
    "    return simple_pancakes == sorted(simple_pancakes)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [],
   "source": [
    "flips_t = [l.strip().split(': ') for l in open('../../data/07-flips.txt')]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [],
   "source": [
    "stack = [[int(p) for p in l.split()] for c, l in flips_t if c == 'burgers'][0]\n",
    "flips = {int(c): [int(p) for p in l.split()] for c, l in flips_t if c != 'burgers'}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "69"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sum(1 for f in flips.values()\n",
    "   if unburnt_sorted(enflip(stack, f)))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "92"
      ]
     },
     "execution_count": 30,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[f for f in flips\n",
    "   if burnt_sorted(enflip(stack, flips[f], burnt=True))][0]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.6"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}