Tidyied up problem ideas

diff --git a/problem-ideas.ipynb b/problem-ideas.ipynb
index 72ca0213a43ada33a09cc9f6fe5d9abccc2355fc..1b09937a47397f54dd90b671efc5db1bb0cc52d7 100644 (file)
--- a/problem-ideas.ipynb
+++ b/problem-ideas.ipynb
@@ -63,8 +63,11 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Travelling salesman: given a network, find the shortest route between them, without visiting the same spot twice.\n",
+    "## Travelling salesman\n",
+    "Given a network, find the shortest route between them, without visiting the same spot twice.\n",
+    "\n",
     "Extension: find the longest travelling salesman route.\n",
+    "\n",
     "Extension: relax the constraint, and allow repeated visits to the same place. What's the shortest route now?"
    ]
   },
@@ -72,15 +75,19 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Virtual machine: run the assembly program, what's the result?\n",
-    "Extension: run it again on different input."
+    "# Virtual machine\n",
+    "Run the assembly program, what's the result? Count the steps in a collatz sequence?\n",
+    "\n",
+    "Extension: run it again on different input. This takes longer."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "## Satisfiability\n",
     "Given a boolean expression, how many variables are in it?\n",
+    "\n",
     "Extension: is it satisfiable?"
    ]
   },
@@ -88,7 +95,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Battleships: given a grid of hits and misses, where could be battleship be? (count how many positions it could be in) Assume the battleship is unhit.\n",
+    "## Battleships\n",
+    "Given a grid of hits and misses, where could be battleship be? (count how many positions it could be in) Assume the battleship is unhit.\n",
+    "\n",
     "Extension: the battleship might have been hit, but not sunk. Now how many places could it be?"
    ]
   },
@@ -96,6 +105,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "## Multi-knapsack\n",
     "How many ways can you fill a bunch of knapsacks (e.g. Advent 2015 days 17, 24)"
    ]
   },
@@ -103,7 +113,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Phone number puzzle: words that fit a phone number.\n",
+    "## Phone number puzzle\n",
+    "Words that fit a phone number.\n",
+    "\n",
     "Extension: non-ascii unicode in input"
    ]
   },
@@ -111,7 +123,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Rainfall problem:\n",
+    "## Rainfall problem\n",
     "http://dl.acm.org.libezproxy.open.ac.uk/citation.cfm?doid=6592.6594"
    ]
   },
@@ -119,28 +131,36 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Ten-pin bowling scores. Given a sequence of number of pins knocked down, calculate total score."
+    "## Ten-pin bowling scores. \n",
+    "Given a sequence of number of pins knocked down, calculate total score.\n",
+    "\n",
+    "Extension: the sequence of scores is for several players, doing round after round. Who wins?"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Pack and justify text into paragraphs."
+    "## Pack and justify text into paragraphs."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Word chain puzzles"
+    "## Word chain puzzles\n",
+    "Given a start and end word and a dictionary, find a chain of valid words transforming one to the other.\n",
+    "\n",
+    "Extension: what is the shortest chain? What is the longest chain without repeated words?"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "## [Amidakuji / Ghost leg](https://en.wikipedia.org/wiki/Ghost_Leg)\n",
     "Derangement network simulation.\n",
+    "\n",
     "Extension: sum several networks"
    ]
   },
@@ -148,29 +168,44 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Machine code execution: Collatz sequence, count steps."
+    "## Parcel pricing\n",
+    "By weight and volumetric weight. \n",
+    "\n",
+    "Find total postage cost of list of parcels. Each parcel given as w, h, l, mass.\n",
+    "\n",
+    "Extension: find the volumetric weight of the packages. \n"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Parcel pricing, by weight and volumetric weight. Find total postage cost of list of parcels. Each parcel given as w, h, l, mass."
+    "## Parcel wrapping: \n",
+    "First, find area, \n",
+    "\n",
+    "Extension: find width of 1m strip to wrap. Include extra for wriggle room."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Parcel wrapping: first, find area, then find width of 1m strip to wrap. Include extra for wriggle room."
+    "## Mastermind\n",
+    "How many valid solutions remain after the scores you've seen\n",
+    "\n",
+    "Extension: How many scores are possible for this attempt?"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Mastermind: how many valid solutions remain after the scores you've seen\n",
-    "How many scores are possible for this attempt?~"
+    "## Lift simulator\n",
+    "Given a sequence of lift calls (time of call, floor of call, destination of passenger), what is the best solution to move all the passengers? Cost sum of passenger waits, where a passenger wait is the time between calling a lift and arriving at destination.\n",
+    "\n",
+    "Extension: multiple lifts?\n",
+    "\n",
+    "Extension: limited capacity in lift"
    ]
   },
   {