106 lines
3.8 KiB
C++
106 lines
3.8 KiB
C++
/*
|
|
|
|
Copyright (c) 2015, Project OSRM contributors
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without modification,
|
|
are permitted provided that the following conditions are met:
|
|
|
|
Redistributions of source code must retain the above copyright notice, this list
|
|
of conditions and the following disclaimer.
|
|
Redistributions in binary form must reproduce the above copyright notice, this
|
|
list of conditions and the following disclaimer in the documentation and/or
|
|
other materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
|
|
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef TRIP_BRUTE_FORCE_HPP
|
|
#define TRIP_BRUTE_FORCE_HPP
|
|
|
|
#include "../data_structures/search_engine.hpp"
|
|
#include "../util/dist_table_wrapper.hpp"
|
|
#include "../util/simple_logger.hpp"
|
|
|
|
#include <osrm/json_container.hpp>
|
|
|
|
#include <cstdlib>
|
|
#include <algorithm>
|
|
#include <string>
|
|
#include <iterator>
|
|
#include <vector>
|
|
#include <limits>
|
|
|
|
namespace osrm
|
|
{
|
|
namespace trip
|
|
{
|
|
|
|
// computes the distance of a given permutation
|
|
EdgeWeight ReturnDistance(const DistTableWrapper<EdgeWeight> &dist_table,
|
|
const std::vector<NodeID> &location_order,
|
|
const EdgeWeight min_route_dist,
|
|
const std::size_t component_size)
|
|
{
|
|
EdgeWeight route_dist = 0;
|
|
std::size_t i = 0;
|
|
while (i < location_order.size() && (route_dist < min_route_dist))
|
|
{
|
|
route_dist += dist_table(location_order[i], location_order[(i + 1) % component_size]);
|
|
BOOST_ASSERT_MSG(dist_table(location_order[i], location_order[(i + 1) % component_size]) !=
|
|
INVALID_EDGE_WEIGHT,
|
|
"invalid route found");
|
|
++i;
|
|
}
|
|
|
|
return route_dist;
|
|
}
|
|
|
|
// computes the route by computing all permutations and selecting the shortest
|
|
template <typename NodeIDIterator>
|
|
std::vector<NodeID> BruteForceTrip(const NodeIDIterator start,
|
|
const NodeIDIterator end,
|
|
const std::size_t number_of_locations,
|
|
const DistTableWrapper<EdgeWeight> &dist_table)
|
|
{
|
|
const auto component_size = std::distance(start, end);
|
|
|
|
std::vector<NodeID> perm(start, end);
|
|
std::vector<NodeID> route;
|
|
route.reserve(component_size);
|
|
|
|
EdgeWeight min_route_dist = INVALID_EDGE_WEIGHT;
|
|
|
|
// check length of all possible permutation of the component ids
|
|
|
|
BOOST_ASSERT_MSG(perm.size() > 0, "no permutation given");
|
|
BOOST_ASSERT_MSG(*(std::max_element(std::begin(perm), std::end(perm))) < number_of_locations,
|
|
"invalid node id");
|
|
BOOST_ASSERT_MSG(*(std::min_element(std::begin(perm), std::end(perm))) >= 0, "invalid node id");
|
|
|
|
do
|
|
{
|
|
const auto new_distance = ReturnDistance(dist_table, perm, min_route_dist, component_size);
|
|
if (new_distance <= min_route_dist)
|
|
{
|
|
min_route_dist = new_distance;
|
|
route = perm;
|
|
}
|
|
} while (std::next_permutation(std::begin(perm), std::end(perm)));
|
|
|
|
return route;
|
|
}
|
|
|
|
} // end namespace trip
|
|
} // end namespace osrm
|
|
#endif // TRIP_BRUTE_FORCE_HPP
|