     "metadata": {},
     "source": [
      "## Constraints\n",
      "\n",
      "* Is a naiive solution sufficient?\n",
      "    * Yes\n",
      "* Are duplicates allowed?\n",
      "    * Yes\n",
      "* Can we assume the input is valid?\n",
      "    * No\n",
 
</s>
    "* Is a naive solution sufficient?\n",
     "metadata": {},
     "source": [
      "## Constraints\n",
      "\n",
    "* Is a naive solution sufficient?\n",
      "    * Yes\n",
      "* Are duplicates allowed?\n",
      "    * Yes\n",
      "* Can we assume the input is valid?\n",
      "    * No\n",
keep keep keep keep replace keep keep keep keep keep
 Update insertion sort challenge (#137)

Update constraints and algorithm.
sorting_searching/insertion_sort/insertion_sort_solution.ipynb