{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 91,
   "id": "opening-munich",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "\n",
    "def new_grid(n):\n",
    "    return np.zeros((n,n), np.int64)\n",
    "\n",
    "def parse_points(seg):\n",
    "    start, end = seg.rstrip().split(' -> ')\n",
    "    x1, y1 = map(int, start.split(','))\n",
    "    x2, y2 = map(int, end.split(','))\n",
    "    return x1, y1, x2, y2\n",
    "\n",
    "def slice_range(x1, y1, x2, y2):\n",
    "    if y1 > y2:\n",
    "        y = range(y1, y2-1, -1)\n",
    "    else:\n",
    "        y = range(y1, y2+1)\n",
    "        \n",
    "    if x1 > x2:\n",
    "        x = range(x1, x2-1, -1)\n",
    "    else:\n",
    "        x = range(x1, x2+1)\n",
    "    \n",
    "    return (y, x)\n",
    "    \n",
    "\n",
    "def grid_slice(grid, seg, diagonal):\n",
    "    x1, y1, x2, y2 = parse_points(seg)\n",
    "    if y1 == y2 or x1 == x2 or diagonal:\n",
    "        return slice_range(x1, y1, x2, y2)\n",
    "    else:\n",
    "        return None\n",
    "\n",
    "def overlapping(grid, f, diagonal=False):\n",
    "    for l in f.splitlines():\n",
    "        s = grid_slice(grid, l, diagonal)\n",
    "        if s is not None:\n",
    "            grid[s] += 1\n",
    "    return np.sum(grid >= 2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 93,
   "id": "colonial-karen",
   "metadata": {},
   "outputs": [],
   "source": [
    "g = new_grid(10)\n",
    "test = \"\"\"0,9 -> 5,9\n",
    "8,0 -> 0,8\n",
    "9,4 -> 3,4\n",
    "2,2 -> 2,1\n",
    "7,0 -> 7,4\n",
    "6,4 -> 2,0\n",
    "0,9 -> 2,9\n",
    "3,4 -> 1,4\n",
    "0,0 -> 8,8\n",
    "5,5 -> 8,2\"\"\"\n",
    "assert overlapping(g, test) == 5\n",
    "g = new_grid(10)\n",
    "assert overlapping(g, test, diagonal=True) == 12"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "id": "russian-skiing",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "5280"
      ]
     },
     "execution_count": 50,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import import_ipynb\n",
    "import helper\n",
    "f = helper.read_file('2021_5.txt')\n",
    "g = new_grid(1000)\n",
    "overlapping(g, f)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 94,
   "id": "catholic-glory",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "16716"
      ]
     },
     "execution_count": 94,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "g = new_grid(1000)\n",
    "overlapping(g, f, diagonal=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "superior-purple",
   "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": "3.9.2"
  },
  "title": "Hydrothermal Venture"
 },
 "nbformat": 4,
 "nbformat_minor": 5
}