      "    * Yes\n",
      "* For simplicity, can we use just a Node class without a wrapper Tree class?\n",
      "    * Yes\n",
      "* Do we have to keep track of the parent nodes?\n",
      "    * This is optional"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
 
</s>
    "    * This is optional\n",
    "* Can we assume this fits in memory?\n",
    "    * Yes"
      "    * Yes\n",
      "* For simplicity, can we use just a Node class without a wrapper Tree class?\n",
      "    * Yes\n",
      "* Do we have to keep track of the parent nodes?\n",
    "    * This is optional\n",
    "* Can we assume this fits in memory?\n",
    "    * Yes"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
keep keep keep keep replace keep keep keep keep keep
 Polish bst challenge and solution (#75)

Update constraints, algorithm discussion, and code.
graphs_trees/bst/bst_solution.ipynb