66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
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#ifndef INCLUDED_C_DIJKSTRAUNDIRECTEDSP_H
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#define INCLUDED_C_DIJKSTRAUNDIRECTEDSP_H
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#ifndef INCLUDED_C_EDGEWEIGHTEDGRAPH_H
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#include <c_EdgeWeightedGraph.h>
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#endif /*INCLUDED_C_EDGEWEIGHTEDGRAPH_H*/
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#ifndef INCLUDED_C_VERTEXIDLIST_H
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#include <c_VertexIdList.h>
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#endif /*INCLUDED_C_VERTEXIDLIST_H*/
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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typedef struct {
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c_size_t* edge_to; /* edge_to[w] = entering edge_id on shortest path to w */
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c_size_t* from_vertex; /* from_vertex[w] = source vertex parent link on path to w */
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double* dist_to; /* dist_to[w] = cumulative distance from source to w */
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c_size_t s; /* The starting source vertex index */
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c_size_t V; /* Total number of vertices in the graph */
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c_Allocator_t allocator; /* Deep copy of the user-provided allocator */
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} c_DijkstraUndirectedSP_t;
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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/**
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* @brief Computes a shortest-paths tree from the source vertex 's' in the edge-weighted undirected graph.
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* @param allocator Explicit allocator context used to configure internal tracking state memory
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*/
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c_err_t c_DijkstraUndirectedSP_Init(c_DijkstraUndirectedSP_t* self, c_EdgeWeightedGraph_t* graph, c_size_t s, c_Allocator_t* allocator);
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/**
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* @brief Releases internal tracking buffers safely.
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*/
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void c_DijkstraUndirectedSP_Destroy(c_DijkstraUndirectedSP_t* self);
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/**
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* @brief Is there a path from the source vertex 's' to vertex 'v'?
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*/
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C_STATIC_FORCE_INLINE
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c_bool_t c_DijkstraUndirectedSP_HasPathTo(c_DijkstraUndirectedSP_t* self, c_size_t v) {
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if (!self || v >= self->V || !self->dist_to) return C_FALSE;
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return self->dist_to[v] < DBL_MAX;
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}
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/**
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* @brief Returns the distance of the shortest path from the source vertex 's' to vertex 'v'.
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*/
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C_STATIC_FORCE_INLINE
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double c_DijkstraUndirectedSP_DistTo(c_DijkstraUndirectedSP_t* self, c_size_t v) {
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if (!self || v >= self->V || !self->dist_to) return DBL_MAX;
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return self->dist_to[v];
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}
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/**
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* @brief Reconstructs the exact shortest path from the source vertex 's' to vertex 'v' and appends it to out_path.
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* @param out_path An initialized c_VertexIdList_t container to collect the sequence of global edge_ids.
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*/
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c_err_t c_DijkstraUndirectedSP_PathTo(c_DijkstraUndirectedSP_t* self, c_size_t v, c_VertexIdList_t* out_path);
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#endif /*INCLUDED_C_DIJKSTRAUNDIRECTEDSP_H*/
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