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<div class="fragment"><div class="line"><span class="comment">// Copyright 2010-2021 Google LLC</span></div><div class="line"><span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><span class="comment">//</span></div><div class="line"><span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><span class="comment">//</span></div><div class="line"><span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><span class="comment">// limitations under the License.</span></div><div class="line"></div><div class="line"><span class="comment">// [START program]</span></div><div class="line"><span class="comment">// [START import]</span></div><div class="line"><span class="preprocessor">#include <cstdint></span></div><div class="line"><span class="preprocessor">#include <vector></span></div><div class="line"></div><div class="line"><span class="preprocessor">#include "<a class="code" href="routing_8h.html">ortools/constraint_solver/routing.h</a>"</span></div><div class="line"><span class="preprocessor">#include "<a class="code" href="routing__enums_8pb_8h.html">ortools/constraint_solver/routing_enums.pb.h</a>"</span></div><div class="line"><span class="preprocessor">#include "<a class="code" href="routing__index__manager_8h.html">ortools/constraint_solver/routing_index_manager.h</a>"</span></div><div class="line"><span class="preprocessor">#include "<a class="code" href="routing__parameters_8h.html">ortools/constraint_solver/routing_parameters.h</a>"</span></div><div class="line"><span class="comment">// [END import]</span></div><div class="line"></div><div class="line"><span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</div><div class="line"><span class="comment">// [START data_model]</span></div><div class="line"><span class="keyword">struct </span>DataModel {</div><div class="line"> <span class="keyword">const</span> std::vector<std::vector<int64_t>> distance_matrix{</div><div class="line"> {0, 548, 776, 696, 582, 274, 502, 194, 308, 194, 536, 502, 388, 354, 468,</div><div class="line"> 776, 662},</div><div class="line"> {548, 0, 684, 308, 194, 502, 730, 354, 696, 742, 1084, 594, 480, 674,</div><div class="line"> 1016, 868, 1210},</div><div class="line"> {776, 684, 0, 992, 878, 502, 274, 810, 468, 742, 400, 1278, 1164, 1130,</div><div class="line"> 788, 1552, 754},</div><div class="line"> {696, 308, 992, 0, 114, 650, 878, 502, 844, 890, 1232, 514, 628, 822,</div><div class="line"> 1164, 560, 1358},</div><div class="line"> {582, 194, 878, 114, 0, 536, 764, 388, 730, 776, 1118, 400, 514, 708,</div><div class="line"> 1050, 674, 1244},</div><div class="line"> {274, 502, 502, 650, 536, 0, 228, 308, 194, 240, 582, 776, 662, 628, 514,</div><div class="line"> 1050, 708},</div><div class="line"> {502, 730, 274, 878, 764, 228, 0, 536, 194, 468, 354, 1004, 890, 856, 514,</div><div class="line"> 1278, 480},</div><div class="line"> {194, 354, 810, 502, 388, 308, 536, 0, 342, 388, 730, 468, 354, 320, 662,</div><div class="line"> 742, 856},</div><div class="line"> {308, 696, 468, 844, 730, 194, 194, 342, 0, 274, 388, 810, 696, 662, 320,</div><div class="line"> 1084, 514},</div><div class="line"> {194, 742, 742, 890, 776, 240, 468, 388, 274, 0, 342, 536, 422, 388, 274,</div><div class="line"> 810, 468},</div><div class="line"> {536, 1084, 400, 1232, 1118, 582, 354, 730, 388, 342, 0, 878, 764, 730,</div><div class="line"> 388, 1152, 354},</div><div class="line"> {502, 594, 1278, 514, 400, 776, 1004, 468, 810, 536, 878, 0, 114, 308,</div><div class="line"> 650, 274, 844},</div><div class="line"> {388, 480, 1164, 628, 514, 662, 890, 354, 696, 422, 764, 114, 0, 194, 536,</div><div class="line"> 388, 730},</div><div class="line"> {354, 674, 1130, 822, 708, 628, 856, 320, 662, 388, 730, 308, 194, 0, 342,</div><div class="line"> 422, 536},</div><div class="line"> {468, 1016, 788, 1164, 1050, 514, 514, 662, 320, 274, 388, 650, 536, 342,</div><div class="line"> 0, 764, 194},</div><div class="line"> {776, 868, 1552, 560, 674, 1050, 1278, 742, 1084, 810, 1152, 274, 388,</div><div class="line"> 422, 764, 0, 798},</div><div class="line"> {662, 1210, 754, 1358, 1244, 708, 480, 856, 514, 468, 354, 844, 730, 536,</div><div class="line"> 194, 798, 0},</div><div class="line"> };</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> num_vehicles = 4;</div><div class="line"> <span class="keyword">const</span> <a name="a0"></a><a class="code" href="classoperations__research_1_1_routing_index_manager.html#aeb44c17e71161ec3a77d4a87e358c84b">RoutingIndexManager::NodeIndex</a> depot{0};</div><div class="line">};</div><div class="line"><span class="comment">// [END data_model]</span></div><div class="line"></div><div class="line"><span class="comment">// [START solution_printer]</span></div><div class="line"><span class="comment"></span><span class="keywordtype">void</span> PrintSolution(<span class="keyword">const</span> DataModel& data, <span class="keyword">const</span> RoutingIndexManager& manager,</div><div class="line"> <span class="keyword">const</span> RoutingModel& routing, <span class="keyword">const</span> Assignment& solution) {</div><div class="line"> <a name="a1"></a><a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a name="a2"></a><a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">"Objective: "</span> << solution.ObjectiveValue();</div><div class="line"> int64_t total_distance{0};</div><div class="line"> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> vehicle_id = 0; vehicle_id < data.num_vehicles; ++vehicle_id) {</div><div class="line"> int64_t <a name="a3"></a><a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a> = routing.Start(vehicle_id);</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">"Route for Vehicle "</span> << vehicle_id << <span class="stringliteral">":"</span>;</div><div class="line"> int64_t <a name="a4"></a><a class="code" href="routing__search_8cc.html#a79b8e036dca6911e3295a47d99f21f43">distance</a>{0};</div><div class="line"> std::stringstream route;</div><div class="line"> <span class="keywordflow">while</span> (routing.IsEnd(<a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a>) == <span class="keyword">false</span>) {</div><div class="line"> route << manager.IndexToNode(<a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a>).value() << <span class="stringliteral">" -> "</span>;</div><div class="line"> int64_t previous_index = <a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a>;</div><div class="line"> <a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a> = solution.Value(routing.NextVar(<a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a>));</div><div class="line"> <a class="code" href="routing__search_8cc.html#a79b8e036dca6911e3295a47d99f21f43">distance</a> += routing.GetArcCostForVehicle(previous_index, <a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a>,</div><div class="line"> int64_t{vehicle_id});</div><div class="line"> }</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << route.str() << manager.IndexToNode(<a class="code" href="pack_8cc.html#a750b5d744c39a06bfb13e6eb010e35d0">index</a>).value();</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">"Distance of the route: "</span> << <a class="code" href="routing__search_8cc.html#a79b8e036dca6911e3295a47d99f21f43">distance</a> << <span class="stringliteral">"m"</span>;</div><div class="line"> total_distance += <a class="code" href="routing__search_8cc.html#a79b8e036dca6911e3295a47d99f21f43">distance</a>;</div><div class="line"> }</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">"Total distance of all routes: "</span> << total_distance << <span class="stringliteral">"m"</span>;</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">""</span>;</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">"Advanced usage:"</span>;</div><div class="line"> <a class="code" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code" href="log__severity_8h.html#ab4a2cbab234914b320b7fae11b6e8cb9">INFO</a>) << <span class="stringliteral">"Problem solved in "</span> << routing.solver()->wall_time() << <span class="stringliteral">"ms"</span>;</div><div class="line">}</div><div class="line"><span class="comment">// [END solution_printer]</span></div><div class="line"></div><div class="line"><span class="keywordtype">void</span> Vrp() {</div><div class="line"> <span class="comment">// Instantiate the data problem.</span></div><div class="line"> <span class="comment">// [START data]</span></div><div class="line"> DataModel data;</div><div class="line"> <span class="comment">// [END data]</span></div><div class="line"></div><div class="line"> <span class="comment">// Create Routing Index Manager</span></div><div class="line"> <span class="comment">// [START index_manager]</span></div><div class="line"> RoutingIndexManager manager(data.distance_matrix.size(), data.num_vehicles,</div><div class="line"> data.depot);</div><div class="line"> <span class="comment">// [END index_manager]</span></div><div class="line"></div><div class="line"> <span class="comment">// Create Routing Model.</span></div><div class="line"> <span class="comment">// [START routing_model]</span></div><div class="line"> RoutingModel routing(manager);</div><div class="line"> <span class="comment">// [END routing_model]</span></div><div class="line"></div><div class="line"> <span class="comment">// Create and register a transit callback.</span></div><div class="line"> <span class="comment">// [START transit_callback]</span></div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> transit_callback_index = routing.RegisterTransitCallback(</div><div class="line"> [&data, &manager](int64_t from_index, int64_t to_index) -> int64_t {</div><div class="line"> <span class="comment">// Convert from routing variable Index to distance matrix NodeIndex.</span></div><div class="line"> <span class="keyword">auto</span> from_node = manager.IndexToNode(from_index).value();</div><div class="line"> <span class="keyword">auto</span> to_node = manager.IndexToNode(to_index).value();</div><div class="line"> <span class="keywordflow">return</span> data.distance_matrix[from_node][to_node];</div><div class="line"> });</div><div class="line"> <span class="comment">// [END transit_callback]</span></div><div class="line"></div><div class="line"> <span class="comment">// Define cost of each arc.</span></div><div class="line"> <span class="comment">// [START arc_cost]</span></div><div class="line"> routing.SetArcCostEvaluatorOfAllVehicles(transit_callback_index);</div><div class="line"> <span class="comment">// [END arc_cost]</span></div><div class="line"></div><div class="line"> <span class="comment">// Setting first solution heuristic.</span></div><div class="line"> <span class="comment">// [START parameters]</span></div><div class="line"> RoutingSearchParameters searchParameters = <a name="a5"></a><a class="code" href="namespaceoperations__research.html#ab59d4ce2b572e1ae576d2aa181433187">DefaultRoutingSearchParameters</a>();</div><div class="line"> searchParameters.set_first_solution_strategy(</div><div class="line"> <a name="a6"></a><a class="code" href="classoperations__research_1_1_first_solution_strategy.html#af9514bec629ba99306ed93ab08252708">FirstSolutionStrategy::PATH_CHEAPEST_ARC</a>);</div><div class="line"> <span class="comment">// [END parameters]</span></div><div class="line"></div><div class="line"> <span class="comment">// Solve the problem.</span></div><div class="line"> <span class="comment">// [START solve]</span></div><div class="line"> <span class="keyword">const</span> Assignment* solution = routing.SolveWithParameters(searchParameters);</div><div class="line"> <span class="comment">// [END solve]</span></div><div class="line"></div><div class="line"> <span class="comment">// Print solution on console.</span></div><div class="line"> <span class="comment">// [START print_solution]</span></div><div class="line"> PrintSolution(data, manager, routing, *solution);</div><div class="line"> <span class="comment">// [END print_solution]</span></div><div class="line">}</div><div class="line">} <span class="comment">// namespace operations_research</span></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> <a name="a7"></a><a class="code" href="fz_8cc.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv) {</div><div class="line"> operations_research::Vrp();</div><div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div><div class="line">}</div><div class="line"><span class="comment">// [END program]</span></div></div><!-- fragment --> 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