From 663286390555c85c307d5cd23ef1596f6f97b142 Mon Sep 17 00:00:00 2001
From: watchdogs132 <ankanbose56@gmail.com>
Date: Thu, 10 Nov 2022 21:03:28 +0530
Subject: [PATCH] closed model in vrp_initial_routes

---
 .../samples/vrp_initial_routes.cc             | 18 +++++++++++------
 .../samples/vrp_initial_routes.py             | 20 ++++++++++++++-----
 2 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/ortools/constraint_solver/samples/vrp_initial_routes.cc b/ortools/constraint_solver/samples/vrp_initial_routes.cc
index 4b823145e8..93bf850fdc 100644
--- a/ortools/constraint_solver/samples/vrp_initial_routes.cc
+++ b/ortools/constraint_solver/samples/vrp_initial_routes.cc
@@ -147,7 +147,17 @@ void VrpInitialRoutes() {
   routing.GetMutableDimension("Distance")->SetGlobalSpanCostCoefficient(100);
   // [END distance_constraint]
 
-  // Get initial solution from routes.
+  // [START parameters]
+  RoutingSearchParameters searchParameters = DefaultRoutingSearchParameters();
+  searchParameters.set_first_solution_strategy(FirstSolutionStrategy_Value_PATH_CHEAPEST_ARC);
+  searchParameters.set_local_search_metaheuristic(LocalSearchMetaheuristic::GUIDED_LOCAL_SEARCH);
+  searchParameters.mutable_time_limit()->set_seconds(5);
+  // When an initial solution is given for search, the model should be closed, 
+  // otherwise the solver will ignore the search parameters.
+  routing.CloseModelWithParameters(searchParameters);
+  // [END parameters]
+
+  // Get initial solution from routes after closing the model.
   // [START print_initial_solution]
   const Assignment* initial_solution =
       routing.ReadAssignmentFromRoutes(data.initial_routes, true);
@@ -155,16 +165,12 @@ void VrpInitialRoutes() {
   LOG(INFO) << "Initial solution: ";
   PrintSolution(data, manager, routing, *initial_solution);
   // [END print_initial_solution]
-  // Setting first solution heuristic.
-  // [START parameters]
-  RoutingSearchParameters searchParameters = DefaultRoutingSearchParameters();
-  // [END parameters]
 
   // Solve from initial solution.
   // [START solve]
   const Assignment* solution = routing.SolveFromAssignmentWithParameters(
       initial_solution, searchParameters);
-  // [START solve]
+  // [END solve]
 
   // Print solution on console.
   // [START print_solution]
diff --git a/ortools/constraint_solver/samples/vrp_initial_routes.py b/ortools/constraint_solver/samples/vrp_initial_routes.py
index 35d811615d..673ecb8508 100755
--- a/ortools/constraint_solver/samples/vrp_initial_routes.py
+++ b/ortools/constraint_solver/samples/vrp_initial_routes.py
@@ -16,6 +16,7 @@
 """Vehicles Routing Problem (VRP)."""
 
 # [START import]
+from ortools.constraint_solver import routing_enums_pb2
 from ortools.constraint_solver import pywrapcp
 # [END import]
 
@@ -181,6 +182,20 @@ def main():
     distance_dimension.SetGlobalSpanCostCoefficient(100)
     # [END distance_constraint]
 
+    # Set default search parameters.
+    # [START parameters]
+    search_parameters = pywrapcp.DefaultRoutingSearchParameters()
+    search_parameters.first_solution_strategy = (
+        routing_enums_pb2.FirstSolutionStrategy.PATH_CHEAPEST_ARC)
+    search_parameters.local_search_metaheuristic = (
+        routing_enums_pb2.LocalSearchMetaheuristic.GUIDED_LOCAL_SEARCH)
+    search_parameters.time_limit.FromSeconds(5)
+    # When an initial solution is given for search, the model should be closed, 
+    # otherwise the solver will ignore the search parameters.
+    routing.CloseModelWithParameters(search_parameters)
+    # [END parameters]
+
+    # Get initial solution from routes after closing the model.
     # [START print_initial_solution]
     initial_solution = routing.ReadAssignmentFromRoutes(data['initial_routes'],
                                                         True)
@@ -188,11 +203,6 @@ def main():
     print_solution(data, manager, routing, initial_solution)
     # [END print_initial_solution]
 
-    # Set default search parameters.
-    # [START parameters]
-    search_parameters = pywrapcp.DefaultRoutingSearchParameters()
-    # [END parameters]
-
     # Solve the problem.
     # [START solve]
     solution = routing.SolveFromAssignmentWithParameters(