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algorithms(bf-to-astar): factor out the heap and dirs
Signed-off-by: Matej Focko <me@mfocko.xyz>
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5164a31ce2
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3 changed files with 24 additions and 26 deletions
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@ -8,10 +8,6 @@
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#include "graph.hpp"
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const static std::vector<vertex_t> DIRECTIONS =
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std::vector{std::make_pair(0, 1), std::make_pair(0, -1),
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std::make_pair(1, 0), std::make_pair(-1, 0)};
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static auto _check_vertex(const graph& g,
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std::vector<std::vector<int>>& distances, int v,
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bool check_only = false) -> bool {
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@ -10,28 +10,6 @@
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#include "graph.hpp"
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namespace {
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using pqueue_item_t = std::pair<int, vertex_t>;
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using pqueue_t = std::vector<pqueue_item_t>;
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auto pushq(pqueue_t& q, pqueue_item_t v) -> void {
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q.push_back(v);
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std::push_heap(q.begin(), q.end(), std::greater<>{});
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}
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auto popq(pqueue_t& q) -> std::optional<pqueue_item_t> {
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if (q.empty()) {
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return {};
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}
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std::pop_heap(q.begin(), q.end(), std::greater<>{});
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pqueue_item_t top = q.back();
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q.pop_back();
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return std::make_optional(top);
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}
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} // namespace
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auto dijkstra(const graph& g, const vertex_t& source)
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-> std::vector<std::vector<int>> {
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// make sure that ‹source› exists
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@ -81,4 +81,28 @@ std::ostream& operator<<(std::ostream& os, const graph& g) {
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return os;
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}
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const static std::vector<vertex_t> DIRECTIONS =
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std::vector{std::make_pair(0, 1), std::make_pair(0, -1),
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std::make_pair(1, 0), std::make_pair(-1, 0)};
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using pqueue_item_t = std::pair<int, vertex_t>;
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using pqueue_t = std::vector<pqueue_item_t>;
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auto pushq(pqueue_t& q, pqueue_item_t v) -> void {
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q.push_back(v);
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std::push_heap(q.begin(), q.end(), std::greater<>{});
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}
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auto popq(pqueue_t& q) -> std::optional<pqueue_item_t> {
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if (q.empty()) {
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return {};
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}
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std::pop_heap(q.begin(), q.end(), std::greater<>{});
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pqueue_item_t top = q.back();
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q.pop_back();
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return std::make_optional(top);
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}
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#endif /* _GRAPH_HPP */
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