在Google OR-Tools中设置每条路线的最小位置可以通过以下步骤实现:
下面是一个示例代码片段,演示如何在Google OR-Tools中设置每条路线的最小位置:
from ortools.constraint_solver import routing_enums_pb2
from ortools.constraint_solver import pywrapcp
def create_data_model():
data = {}
# 定义节点位置
data['locations'] = [
(4, 4), # 起始位置
(2, 0), # 节点 1
(8, 0), # 节点 2
(0, 1), # 节点 3
(1, 2), # 节点 4
(5, 2), # 节点 5
(7, 2), # 节点 6
(3, 3), # 节点 7
(6, 3), # 节点 8
(5, 5), # 节点 9
(8, 5), # 节点 10
(1, 6), # 节点 11
(2, 7), # 节点 12
(3, 7), # 节点 13
(6, 7), # 节点 14
(0, 8), # 节点 15
(7, 8) # 节点 16
]
data['num_locations'] = len(data['locations'])
data['num_vehicles'] = 1
data['depot'] = 0
return data
def main():
data = create_data_model()
# 创建一个Solver对象
manager = pywrapcp.RoutingIndexManager(data['num_locations'], data['num_vehicles'], data['depot'])
routing = pywrapcp.RoutingModel(manager)
# 设置节点位置
for i, location in enumerate(data['locations']):
routing.AddDisjunction([manager.NodeToIndex(i)], 1000) # 设置惩罚成本
# 设置位置约束
dimension_name = 'Location'
routing.AddDimension(
routing.RegisterTransitCallback(lambda from_index, to_index: manager.Distance(from_index, to_index)),
0, 100, True, dimension_name)
# 设置每条路线的最小位置
nodes = [1, 2, 3] # 设置节点 1, 2, 3 的最小位置
penalty = 1000
routing.AddSoftSameVehicleConstraint(nodes, penalty)
# 设置搜索参数
search_parameters = pywrapcp.DefaultRoutingSearchParameters()
search_parameters.first_solution_strategy = (
routing_enums_pb2.FirstSolutionStrategy.PATH_CHEAPEST_ARC)
# 解决问题
solution = routing.SolveWithParameters(search_parameters)
# 输出结果
if solution:
print_solution(manager, routing, solution)
def print_solution(manager, routing, solution):
print('Objective: {}'.format(solution.ObjectiveValue()))
index = routing.Start(0)
plan_output = 'Route:\n'
route_distance = 0
while not routing.IsEnd(index):
plan_output += ' {} ->'.format(manager.IndexToNode(index))
previous_index = index
index = solution.Value(routing.NextVar(index))
route_distance += routing.GetArcCostForVehicle(previous_index, index, 0)
plan_output += ' {}\n'.format(manager.IndexToNode(index))
route_distance += routing.GetArcCostForVehicle(previous_index, index, 0)
plan_output += 'Distance of the route: {}\n'.format(route_distance)
print(plan_output)
if __name__ == '__main__':
main()
以上示例代码演示了如何使用Google OR-Tools设置每条路线的最小位置。在该示例中,节点1、2和3被设置为具有最小位置的节点,以确保它们的位置满足要求。你可以根据实际需求进行调整,并根据具体情况使用腾讯云的相关产品进行实现。
腾讯云相关产品和产品介绍链接地址:
领取专属 10元无门槛券
手把手带您无忧上云