adventcode2024/7/7.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "with open('input', 'r') as file:\n",
    "    content = file.readlines()\n",
    "\n",
    "lines = [line.strip().split(':') for line in content]\n",
    "lines = [(int(x),[int(val) for val in y.strip().split(' ')]) for x,y in lines]\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import itertools\n",
    "\n",
    "# Input lists\n",
    "values = [1, 2, 3,5,6]\n",
    "\n",
    "def test(values, expected):\n",
    "    operators = ['+', '*']\n",
    "    # Generate and calculate combinations directly\n",
    "    for signs in itertools.product(operators, repeat=len(values)-1):\n",
    "        # Start with the first number\n",
    "        result = values[0]\n",
    "        # Apply each operator with the subsequent number\n",
    "        for num, sign in zip(values[1:], signs):\n",
    "            if sign == '+':\n",
    "                result += num\n",
    "            elif sign == '*':\n",
    "                result *= num\n",
    "        if result == expected:\n",
    "            return True\n",
    "    return False\n",
    "\n",
    "test(values,51)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1260333054159"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "total = 0\n",
    "for result, values in lines:\n",
    "    if test(values,result):\n",
    "        total += result\n",
    "\n",
    "total"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Part 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import re\n",
    "\n",
    "splitter = re.compile(r'(\\+|\\*|\\|)')\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "def evaluate_expression_no_precedence(expression,expected):\n",
    "    # Handle the case where the expression contains only a number\n",
    "    if expression.isdigit():\n",
    "        return int(expression) == expected\n",
    "\n",
    "    # Split the expression into numbers and operators using regex\n",
    "    parts = splitter.split(expression)\n",
    "    parts = [int(parts[i]) if i % 2 == 0 else parts[i] for i in range(len(parts))]  # Convert numbers to int\n",
    "\n",
    "    # Evaluate left-to-right\n",
    "    result = parts[0]  # Start with the first number\n",
    "    for i in range(1, len(parts), 2):  # Step through operators and numbers\n",
    "        if result > expected:\n",
    "            return False\n",
    "        operator = parts[i]\n",
    "        number = parts[i + 1]\n",
    "        if operator == '+':\n",
    "            result += number\n",
    "        elif operator == '*':\n",
    "            result *= number\n",
    "        elif operator == '|':\n",
    "            result = int(f\"{result}{number}\")\n",
    "\n",
    "    return result == expected\n",
    "\n",
    "evaluate_expression_no_precedence(\"17|8+14\",192)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Input lists\n",
    "def test2(values, expected,debug=False):\n",
    "    operators = ['+', '*', '|']\n",
    "    for signs in itertools.product(operators, repeat=len(values)-1):\n",
    "        expression = f\"{values[0]}\"\n",
    "        for num, sign in zip(values[1:], signs):\n",
    "            expression += f\"{sign}{num}\"\n",
    "        if evaluate_expression_no_precedence(expression,expected):\n",
    "            return True\n",
    "        \n",
    "        \n",
    "    return False\n",
    "\n",
    "test2([17, 8, 14],192,True)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "162042343638683\n"
     ]
    }
   ],
   "source": [
    "\n",
    "total = 0\n",
    "for result, values in lines:\n",
    "    if test2(values,result):\n",
    "        total += result\n",
    "\n",
    "print(total)"
   ]
  }
 ],
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