139 lines
4.0 KiB
Plaintext
139 lines
4.0 KiB
Plaintext
{
|
|
"cells": [
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "google",
|
|
"metadata": {},
|
|
"source": [
|
|
"##### Copyright 2023 Google LLC."
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "apache",
|
|
"metadata": {},
|
|
"source": [
|
|
"Licensed under the Apache License, Version 2.0 (the \"License\");\n",
|
|
"you may not use this file except in compliance with the License.\n",
|
|
"You may obtain a copy of the License at\n",
|
|
"\n",
|
|
" http://www.apache.org/licenses/LICENSE-2.0\n",
|
|
"\n",
|
|
"Unless required by applicable law or agreed to in writing, software\n",
|
|
"distributed under the License is distributed on an \"AS IS\" BASIS,\n",
|
|
"WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
|
|
"See the License for the specific language governing permissions and\n",
|
|
"limitations under the License.\n"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "basename",
|
|
"metadata": {},
|
|
"source": [
|
|
"# knapsack"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "link",
|
|
"metadata": {},
|
|
"source": [
|
|
"<table align=\"left\">\n",
|
|
"<td>\n",
|
|
"<a href=\"https://colab.research.google.com/github/google/or-tools/blob/main/examples/notebook/algorithms/knapsack.ipynb\"><img src=\"https://raw.githubusercontent.com/google/or-tools/main/tools/colab_32px.png\"/>Run in Google Colab</a>\n",
|
|
"</td>\n",
|
|
"<td>\n",
|
|
"<a href=\"https://github.com/google/or-tools/blob/main/ortools/algorithms/samples/knapsack.py\"><img src=\"https://raw.githubusercontent.com/google/or-tools/main/tools/github_32px.png\"/>View source on GitHub</a>\n",
|
|
"</td>\n",
|
|
"</table>"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "doc",
|
|
"metadata": {},
|
|
"source": [
|
|
"First, you must install [ortools](https://pypi.org/project/ortools/) package in this colab."
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "install",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"%pip install ortools"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"id": "description",
|
|
"metadata": {},
|
|
"source": [
|
|
"\n",
|
|
"A simple knapsack problem."
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"id": "code",
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"from ortools.algorithms.python import knapsack_solver\n",
|
|
"\n",
|
|
"\n",
|
|
"def main():\n",
|
|
" # Create the solver.\n",
|
|
" solver = knapsack_solver.KnapsackSolver(\n",
|
|
" knapsack_solver.SolverType.KNAPSACK_MULTIDIMENSION_BRANCH_AND_BOUND_SOLVER,\n",
|
|
" \"KnapsackExample\",\n",
|
|
" )\n",
|
|
"\n",
|
|
" values = [\n",
|
|
" # fmt:off\n",
|
|
" 360, 83, 59, 130, 431, 67, 230, 52, 93, 125, 670, 892, 600, 38, 48, 147,\n",
|
|
" 78, 256, 63, 17, 120, 164, 432, 35, 92, 110, 22, 42, 50, 323, 514, 28,\n",
|
|
" 87, 73, 78, 15, 26, 78, 210, 36, 85, 189, 274, 43, 33, 10, 19, 389, 276,\n",
|
|
" 312\n",
|
|
" # fmt:on\n",
|
|
" ]\n",
|
|
" weights = [\n",
|
|
" # fmt: off\n",
|
|
" [7, 0, 30, 22, 80, 94, 11, 81, 70, 64, 59, 18, 0, 36, 3, 8, 15, 42, 9, 0,\n",
|
|
" 42, 47, 52, 32, 26, 48, 55, 6, 29, 84, 2, 4, 18, 56, 7, 29, 93, 44, 71,\n",
|
|
" 3, 86, 66, 31, 65, 0, 79, 20, 65, 52, 13],\n",
|
|
" # fmt: on\n",
|
|
" ]\n",
|
|
" capacities = [850]\n",
|
|
"\n",
|
|
" solver.init(values, weights, capacities)\n",
|
|
" computed_value = solver.solve()\n",
|
|
"\n",
|
|
" packed_items = []\n",
|
|
" packed_weights = []\n",
|
|
" total_weight = 0\n",
|
|
" print(\"Total value =\", computed_value)\n",
|
|
" for i in range(len(values)):\n",
|
|
" if solver.best_solution_contains(i):\n",
|
|
" packed_items.append(i)\n",
|
|
" packed_weights.append(weights[0][i])\n",
|
|
" total_weight += weights[0][i]\n",
|
|
" print(\"Total weight:\", total_weight)\n",
|
|
" print(\"Packed items:\", packed_items)\n",
|
|
" print(\"Packed_weights:\", packed_weights)\n",
|
|
"\n",
|
|
"\n",
|
|
"main()\n",
|
|
"\n"
|
|
]
|
|
}
|
|
],
|
|
"metadata": {},
|
|
"nbformat": 4,
|
|
"nbformat_minor": 5
|
|
}
|