Question_1_Assignment_4.ipynb

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     "text": [
      "Minimax result: 3\n",
      "Alpha-Beta Pruning result: 3\n"
     ]
    }
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   "source": [
    "# Initial values of Alpha and Beta \n",
    "MIN, MAX = float('-inf'), float('inf')\n",
    "def minimax(depth, nodeIndex, maximizingPlayer, values, alpha, beta):\n",
    "    if depth == 3:\n",
    "        return values[nodeIndex]\n",
    "\n",
    "    if maximizingPlayer:\n",
    "        best = MIN\n",
    "        for i in range(0, 2):\n",
    "            val = minimax(depth + 1, nodeIndex * 2 + i, False, values, alpha, beta)\n",
    "            best = max(best, val)\n",
    "        return best\n",
    "\n",
    "    else:\n",
    "        best = MAX\n",
    "        for i in range(0, 2):\n",
    "            val = minimax(depth + 1, nodeIndex * 2 + i, True, values, alpha, beta)\n",
    "            best = min(best, val)\n",
    "        return best\n",
    "\n",
    "def alpha_beta_pruning(depth, nodeIndex, alpha, beta, maximizingPlayer, values):\n",
    "    if depth == 3:\n",
    "        return values[nodeIndex]\n",
    "\n",
    "    if maximizingPlayer:\n",
    "        best = MIN\n",
    "        for i in range(0, 2):\n",
    "            val = alpha_beta_pruning(depth + 1, nodeIndex * 2 + i, alpha, beta, False, values)\n",
    "            best = max(best, val)\n",
    "            alpha = max(alpha, best)\n",
    "            if beta <= alpha:\n",
    "                break\n",
    "        return best\n",
    "\n",
    "    else:\n",
    "        best = MAX\n",
    "        for i in range(0, 2):\n",
    "            val = alpha_beta_pruning(depth + 1, nodeIndex * 2 + i, alpha, beta, True, values)\n",
    "            best = min(best, val)\n",
    "            beta = min(beta, best)\n",
    "            if beta <= alpha:\n",
    "                break\n",
    "        return best\n",
    "\n",
    "# Driver Code with input passed directly\n",
    "if __name__ == \"__main__\":\n",
    "    # input_values = [-1,4,2,6,-3,-5,0,7]\n",
    "    # input_values = [2,3,5,9,0,1,7,5]\n",
    "    input_values = [-1,3,5,1,-6,-4,0,9]\n",
    "\n",
    "    # Test Minimax\n",
    "    minimax_result = minimax(0, 0, True, input_values, MIN, MAX)\n",
    "    print(\"Minimax result:\", minimax_result)\n",
    "\n",
    "    # Test Alpha-Beta Pruning\n",
    "    alpha_beta_result = alpha_beta_pruning(0, 0, MIN, MAX, True, input_values)\n",
    "    print(\"Alpha-Beta Pruning result:\", alpha_beta_result)\n"
   ]
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