derek.holloway
7502bf64a4
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43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
#ifndef ISL_TARJAN_H
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#define ISL_TARJAN_H
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/* Structure for representing the nodes in the graph being traversed
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* using Tarjan's algorithm.
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* index represents the order in which nodes are visited.
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* min_index is the index of the root of a (sub)component.
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* on_stack indicates whether the node is currently on the stack.
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*/
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struct isl_tarjan_node {
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int index;
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int min_index;
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int on_stack;
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};
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/* Structure for representing the graph being traversed
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* using Tarjan's algorithm.
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* len is the number of nodes
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* node is an array of nodes
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* stack contains the nodes on the path from the root to the current node
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* sp is the stack pointer
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* index is the index of the last node visited
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* order contains the elements of the components separated by -1
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* op represents the current position in order
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*/
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struct isl_tarjan_graph {
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int len;
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struct isl_tarjan_node *node;
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int *stack;
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int sp;
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int index;
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int *order;
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int op;
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};
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struct isl_tarjan_graph *isl_tarjan_graph_init(isl_ctx *ctx, int len,
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isl_bool (*follows)(int i, int j, void *user), void *user);
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struct isl_tarjan_graph *isl_tarjan_graph_component(isl_ctx *ctx, int len,
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int node, isl_bool (*follows)(int i, int j, void *user), void *user);
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struct isl_tarjan_graph *isl_tarjan_graph_free(struct isl_tarjan_graph *g);
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#endif
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