+ "# Project ideas\n",
+ "\n",
+ "[Project workspace](https://learn2.open.ac.uk/course/view.php?id=206050)\n"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Longest substring of _k_ distinct characters\n",
+ "Given a string of letters, what is the longest (contiguous) substring with no more than _k_ distinct characters?\n",
+ "\n",
+ "Could also do it with words instead of letters. \n",
+ "\n",
+ "Not sure how to find the extension..."