Graph

2026-09-07 18:48:16 +08:00
parent 1564716731
commit c945aa211f
138 changed files with 10337 additions and 150 deletions
@@ -0,0 +1,53 @@
+#ifndef INCLUDED_C_DEPTHFIRSTDIRECTEDPATHS_H
+#define INCLUDED_C_DEPTHFIRSTDIRECTEDPATHS_H
+
+#ifndef INCLUDED_C_DIGRAPH_H
+#include <c_Digraph.h>
+#endif /*INCLUDED_C_DIGRAPH_H*/
+
+#ifndef INCLUDED_C_VERTEXIDLIST_H
+#include <c_VertexIdList.h>
+#endif /*INCLUDED_C_VERTEXIDLIST_H*/
+
+
+
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+typedef struct {
+    c_bool_t*      marked;      /* Visited tracking array (size of graph->V) */
+    c_size_t*      edge_to;     /* edge_to[w] = last edge on path from s to w */
+    c_size_t       s;           /* Source vertex */
+    c_Allocator_t  allocator;   /* Copied allocator from the graph for isolation */
+} c_DepthFirstDirectedPaths_t;
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+/**
+ * @brief Computes a directed path tree from a single source vertex 's' using DFS
+ */
+c_err_t c_DepthFirstDirectedPaths_Init(c_DepthFirstDirectedPaths_t* self, const c_Digraph_t* graph, c_size_t s, c_Allocator_t* allocator);
+
+/**
+ * @brief Releases internal tracking buffers
+ */
+void c_DepthFirstDirectedPaths_Destroy(c_DepthFirstDirectedPaths_t* self);
+
+/**
+ * @brief Is there a directed path from the source 's' to vertex 'v'?
+ */
+C_STATIC_FORCE_INLINE c_bool_t c_DepthFirstDirectedPaths_HasPathTo(c_DepthFirstDirectedPaths_t* self, c_size_t v, c_size_t total_V) {
+    if (!self || !self->marked || v >= total_V) return C_FALSE;
+    return self->marked[v];
+}
+
+/**
+ * @brief Reconstructs the exact path from source 's' to vertex 'v' and appends it to out_path
+ * @param out_path An initialized c_VertexIdList_t container to collect the sequence
+ */
+c_err_t c_DepthFirstDirectedPaths_PathTo(c_DepthFirstDirectedPaths_t* self, c_size_t v, c_size_t total_V, c_VertexIdList_t* out_path);
+
+
+#endif /*INCLUDED_C_DEPTHFIRSTDIRECTEDPATHS_H*/