124 lines
3.4 KiB
Plaintext
124 lines
3.4 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"id": "google",
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"metadata": {},
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"source": [
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"##### Copyright 2022 Google LLC."
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]
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},
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{
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"cell_type": "markdown",
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"id": "apache",
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"metadata": {},
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"source": [
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"Licensed under the Apache License, Version 2.0 (the \"License\");\n",
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"you may not use this file except in compliance with the License.\n",
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"You may obtain a copy of the License at\n",
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"\n",
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" http://www.apache.org/licenses/LICENSE-2.0\n",
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"\n",
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"Unless required by applicable law or agreed to in writing, software\n",
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"distributed under the License is distributed on an \"AS IS\" BASIS,\n",
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"WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n",
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"See the License for the specific language governing permissions and\n",
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"limitations under the License.\n"
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]
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},
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{
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"cell_type": "markdown",
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"id": "basename",
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"metadata": {},
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"source": [
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"# simple_knapsack_program"
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]
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},
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{
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"cell_type": "markdown",
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"id": "link",
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"metadata": {},
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"source": [
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"<table align=\"left\">\n",
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"<td>\n",
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"<a href=\"https://colab.research.google.com/github/google/or-tools/blob/main/examples/notebook/algorithms/simple_knapsack_program.ipynb\"><img src=\"https://raw.githubusercontent.com/google/or-tools/main/tools/colab_32px.png\"/>Run in Google Colab</a>\n",
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"</td>\n",
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"<td>\n",
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"<a href=\"https://github.com/google/or-tools/blob/main/ortools/algorithms/samples/simple_knapsack_program.py\"><img src=\"https://raw.githubusercontent.com/google/or-tools/main/tools/github_32px.png\"/>View source on GitHub</a>\n",
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"</td>\n",
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"</table>"
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]
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},
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{
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"cell_type": "markdown",
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"id": "doc",
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"metadata": {},
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"source": [
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"First, you must install [ortools](https://pypi.org/project/ortools/) package in this colab."
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "install",
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"metadata": {},
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"outputs": [],
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"source": [
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"!pip install ortools"
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]
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},
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{
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"cell_type": "markdown",
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"id": "description",
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"metadata": {},
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"source": [
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"\n",
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"A simple knapsack problem."
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "code",
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"metadata": {},
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"outputs": [],
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"source": [
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"from ortools.algorithms import pywrapknapsack_solver\n",
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"\n",
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"\n",
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"def main():\n",
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" # Create the solver.\n",
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" solver = pywrapknapsack_solver.KnapsackSolver(\n",
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" pywrapknapsack_solver.KnapsackSolver.\n",
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" KNAPSACK_DYNAMIC_PROGRAMMING_SOLVER, \"test\")\n",
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"\n",
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" weights = [[\n",
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" 565, 406, 194, 130, 435, 367, 230, 315, 393, 125, 670, 892, 600, 293,\n",
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" 712, 147, 421, 255\n",
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" ]]\n",
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" capacities = [850]\n",
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" values = weights[0]\n",
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"\n",
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" solver.Init(values, weights, capacities)\n",
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" computed_value = solver.Solve()\n",
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"\n",
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" packed_items = [\n",
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" x for x in range(0, len(weights[0])) if solver.BestSolutionContains(x)\n",
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" ]\n",
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" packed_weights = [weights[0][i] for i in packed_items]\n",
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"\n",
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" print(\"Packed items: \", packed_items)\n",
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" print(\"Packed weights: \", packed_weights)\n",
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" print(\"Total weight (same as total value): \", computed_value)\n",
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"\n",
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"\n",
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"main()\n",
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"\n"
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]
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}
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],
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"metadata": {},
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"nbformat": 4,
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"nbformat_minor": 5
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}
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