mfocko/blog
1
0
Fork 0
mirror of https://github.com/mfocko/blog.git synced 2024-12-22 06:01:26 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

algorithms(bf-to-astar): factor out the heap and dirs

Browse source 
Signed-off-by: Matej Focko <me@mfocko.xyz>
This commit is contained in:
Matej Focko 2024-01-03 15:03:33 +01:00
parent 5164a31ce2
commit 21aeeeb042
Signed by: mfocko
GPG key ID: 7C47D46246790496
3 changed files with 24 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
static/files/algorithms/paths/bf-to-astar/bf.hpp
View file

@ -8,10 +8,6 @@
#include "graph.hpp"
const static std::vector<vertex_t> DIRECTIONS =
std::vector{std::make_pair(0, 1), std::make_pair(0, -1),
std::make_pair(1, 0), std::make_pair(-1, 0)};
static auto _check_vertex(const graph& g,
std::vector<std::vector<int>>& distances, int v,
bool check_only = false) -> bool {

22
static/files/algorithms/paths/bf-to-astar/dijkstra.hpp
View file

@ -10,28 +10,6 @@
#include "graph.hpp"
namespace {
using pqueue_item_t = std::pair<int, vertex_t>;
using pqueue_t = std::vector<pqueue_item_t>;
auto pushq(pqueue_t& q, pqueue_item_t v) -> void {
q.push_back(v);
std::push_heap(q.begin(), q.end(), std::greater<>{});
}
auto popq(pqueue_t& q) -> std::optional<pqueue_item_t> {
if (q.empty()) {
return {};
}
std::pop_heap(q.begin(), q.end(), std::greater<>{});
pqueue_item_t top = q.back();
q.pop_back();
return std::make_optional(top);
}
} // namespace
auto dijkstra(const graph& g, const vertex_t& source)
-> std::vector<std::vector<int>> {
// make sure that ‹source› exists

24
static/files/algorithms/paths/bf-to-astar/graph.hpp
View file

@ -81,4 +81,28 @@ std::ostream& operator<<(std::ostream& os, const graph& g) {
return os;
}
const static std::vector<vertex_t> DIRECTIONS =
std::vector{std::make_pair(0, 1), std::make_pair(0, -1),
std::make_pair(1, 0), std::make_pair(-1, 0)};
using pqueue_item_t = std::pair<int, vertex_t>;
using pqueue_t = std::vector<pqueue_item_t>;
auto pushq(pqueue_t& q, pqueue_item_t v) -> void {
q.push_back(v);
std::push_heap(q.begin(), q.end(), std::greater<>{});
}
auto popq(pqueue_t& q) -> std::optional<pqueue_item_t> {
if (q.empty()) {
return {};
}
std::pop_heap(q.begin(), q.end(), std::greater<>{});
pqueue_item_t top = q.back();
q.pop_back();
return std::make_optional(top);
}
#endif /* _GRAPH_HPP */