Tweaks on 10 an 11

11/11_depthfirst_recursion_w_memo.ipynb

@@ -0,0 +1,109 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#input = r'''0 1 10 99 999'''\n",
+    "#input = r'''125 17'''\n",
+    "input = r'''475449 2599064 213 0 2 65 5755 51149'''\n",
+    "\n",
+    "stones = [int(x) for x in input.split()]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from functools import lru_cache\n",
+    "\n",
+    "@lru_cache(maxsize=None)\n",
+    "def step(stone,steps):\n",
+    "    if steps == 1:\n",
+    "        if stone == 0:\n",
+    "            return 1\n",
+    "        elif (tx_stone := str(stone)) and len(tx_stone) %2 == 0:\n",
+    "            return 2\n",
+    "        else:\n",
+    "            return 1\n",
+    "    else:\n",
+    "        if stone == 0:\n",
+    "            return step(1,steps-1)\n",
+    "        elif (tx_stone := str(stone)) and len(tx_stone) %2 == 0:\n",
+    "            half = len(tx_stone)//2\n",
+    "            left = int(tx_stone[:half])\n",
+    "            right = int(tx_stone[half:])\n",
+    "            x_left = step(left,steps-1)\n",
+    "            x_right = step(right,steps-1)\n",
+    "            return x_left + x_right\n",
+    "        else:\n",
+    "            return(step(stone*2024,steps-1))\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "193269"
+      ]
+     },
+     "execution_count": 20,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sum([step(stone,25) for stone in stones])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "228449040027793"
+      ]
+     },
+     "execution_count": 21,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sum([step(stone,75) for stone in stones])"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "advent",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.13.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}