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   "metadata": {},
   "source": [
    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Challenge Notebook"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Problem: Given a list of ints, find the products of every other int for each index.\n",
    "\n",
    "* [Constraints](#Constraints)\n",
    "* [Test Cases](#Test-Cases)\n",
    "* [Algorithm](#Algorithm)\n",
    "* [Code](#Code)\n",
    "* [Unit Test](#Unit-Test)\n",
    "* [Solution Notebook](#Solution-Notebook)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Constraints\n",
    "\n",
    "* Can we use division?\n",
    "    * No\n",
    "* Is the output a list of ints?\n",
    "    * Yes\n",
    "* Can we assume the inputs are valid?\n",
    "    * No\n",
    "* Can we assume this fits memory?\n",
    "    * Yes"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Test Cases\n",
    "\n",
    "<pre>\n",
    "* None -> TypeError\n",
    "* [] -> []\n",
    "* [0] -> []\n",
    "* [0, 1] -> [1, 0]\n",
    "* [0, 1, 2] -> [2, 0, 0]\n",
    "* [1, 2, 3, 4] -> [24, 12, 8, 6]\n",
    "</pre>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Algorithm\n",
    "\n",
    "Refer to the [Solution Notebook]().  If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Code"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "class Solution(object):\n",
    "\n",
    "    def mult_other_numbers(self, array):\n",
    "        # TODO: Implement me\n",
    "        pass"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Unit Test"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**The following unit test is expected to fail until you solve the challenge.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# %load test_mult_other_numbers.py\n",
    "import unittest\n",
    "\n",
    "\n",
    "class TestMultOtherNumbers(unittest.TestCase):\n",
    "\n",
    "    def test_mult_other_numbers(self):\n",
    "        solution = Solution()\n",
    "        self.assertRaises(TypeError, solution.mult_other_numbers, None)\n",
    "        self.assertEqual(solution.mult_other_numbers([0]), [])\n",
    "        self.assertEqual(solution.mult_other_numbers([0, 1]), [1, 0])\n",
    "        self.assertEqual(solution.mult_other_numbers([0, 1, 2]), [2, 0, 0])\n",
    "        self.assertEqual(solution.mult_other_numbers([1, 2, 3, 4]), [24, 12, 8, 6])\n",
    "        print('Success: test_mult_other_numbers')\n",
    "\n",
    "\n",
    "def main():\n",
    "    test = TestMultOtherNumbers()\n",
    "    test.test_mult_other_numbers()\n",
    "\n",
    "\n",
    "if __name__ == '__main__':\n",
    "    main()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Solution Notebook\n",
    "\n",
    "Review the [Solution Notebook]() for a discussion on algorithms and code solutions."
   ]
  }
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