diff options
Diffstat (limited to 'sem1/algo/mm12')
-rw-r--r-- | sem1/algo/mm12/Makefile | 31 | ||||
-rw-r--r-- | sem1/algo/mm12/dijkstra.c | 132 | ||||
-rw-r--r-- | sem1/algo/mm12/graph.c | 123 | ||||
-rw-r--r-- | sem1/algo/mm12/graph.h | 34 |
4 files changed, 0 insertions, 320 deletions
diff --git a/sem1/algo/mm12/Makefile b/sem1/algo/mm12/Makefile deleted file mode 100644 index 7837354..0000000 --- a/sem1/algo/mm12/Makefile +++ /dev/null @@ -1,31 +0,0 @@ -CC = gcc -# Enable gdb and pull include files from current dir -CFLAGS = -ggdb -I. -LDFLAGS = - -BINARY = dijkstra -BUILD_DIR = build - -# Capture c files -c_files = $(wildcard *.c) - -# Convert c names to corrosponding o names -OBJ = $(patsubst %.c, $(BUILD_DIR)/%.o, $(c_files)) - -# $@ is the %.o file and $^ is the %.c file -$(BUILD_DIR)/%.o: %.c - mkdir -p $(dir $@) - $(CC) -c -o $@ $^ $(CFLAGS) - -# $@ becomes left part thus linked -$(BINARY): $(OBJ) - $(CC) -o $@ $^ $(LDFLAGS) - -.PHONY: clean run - -run: $(BINARY) - ./$(BINARY) - -clean: - rm -f $(OBJ) $(BINARY) - rmdir $(BUILD_DIR) diff --git a/sem1/algo/mm12/dijkstra.c b/sem1/algo/mm12/dijkstra.c deleted file mode 100644 index 103c700..0000000 --- a/sem1/algo/mm12/dijkstra.c +++ /dev/null @@ -1,132 +0,0 @@ -#include <stdio.h> -#include <stdlib.h> -#include "graph.h" - -typedef struct list_item { - vertex_t *v; - struct list_item *next; - struct list_item *prev; -} list_item_t; - -typedef struct { - int len; - struct list_item *begin; - struct list_item *end; -} list_t; - -void list_push(list_t *s, vertex_t *v) { - // Create - list_item_t *i = malloc(sizeof(list_item_t)); - i->next = NULL; - i->prev = NULL; - i->v = v; - - // Link - if( s->len == 0 ) { - s->begin = i; - } else { - s->end->next = i; - i->prev = s->end; - } - - s->end = i; - s->len++; -} - -vertex_t *list_pop_smallest(list_t *s) { - list_item_t *smallest = s->begin; - - // Search - list_item_t *i = s->begin; - while( i ) { - if( i->v->dist != -1 && i->v->dist < smallest->v->dist ) { - smallest = i; - } - i = i->next; - } - - if( smallest == s->begin ) { - s->begin = smallest->next; - } else { - smallest->prev->next = smallest->next; - } - - if( smallest == s->end ) { - s->end = smallest->prev; - } else { - smallest->next->prev = smallest->prev; - } - - vertex_t *v = smallest->v; - free(smallest); - - s->len--; - - return v; -} - -graph_t g; - -// Assumes u has an edge to v -void relax(vertex_t *u, vertex_t *v) { - // Get edge between these two guys - edge_t *e = u->adj; - while(e && e->next && e->to->ref != v->ref) { - e = e->next; - } - - if( v->dist == -1 || v->dist > (u->dist + e->weight) ) { - v->dist = u->dist + e->weight; - v->p = u; - } -} - -void dijkstra(graph_t *g, vertex_t *s) { - list_t list; - list.len = 0; - list.end = list.begin = 0; - - s->dist = 0; - - { - vertex_t *v = vertex_next(g, NULL); - while( v ) { - list_push(&list, v); - v = vertex_next(g, v); - } - } - - while( list.len ) { - vertex_t *u = list_pop_smallest(&list); - edge_t *e = u->adj; - while( e ) { - relax(u, e->to ); - e = e->next; - } - } -} - -int main() { - - graph_edge(&g, 'a', 'b', 2); - graph_edge(&g, 'a', 'f', 1); - - graph_edge(&g, 'b', 'd', 3); - graph_edge(&g, 'b', 'c', 4); - - graph_edge(&g, 'd', 'b', 1); - graph_edge(&g, 'd', 'e', 8); - - graph_edge(&g, 'c', 'a', 7); - graph_edge(&g, 'c', 'd', 7); - graph_edge(&g, 'c', 'f', 2); - - graph_edge(&g, 'e', 'c', 2); - graph_edge(&g, 'e', 'f', 2); - - dijkstra(&g, g.vertexes['a']); - - graph_to_dot(stdout, &g); - - return 0; -} diff --git a/sem1/algo/mm12/graph.c b/sem1/algo/mm12/graph.c deleted file mode 100644 index 299ea24..0000000 --- a/sem1/algo/mm12/graph.c +++ /dev/null @@ -1,123 +0,0 @@ -#include <stdio.h> -#include <stdlib.h> -#include "graph.h" - -static vertex_t *create_vertex(char ref) { - // Get some space TODO check for null - vertex_t *v = malloc(sizeof(vertex_t)); - - // Set values - v->ref = ref; - v->dist = -1; - v->p = NULL; - v->adj = NULL; - return v; -} - -static edge_t *create_edge(vertex_t *from, vertex_t *to, int weight) { - edge_t *old = from->adj; - - // Create new list node - edge_t *e = malloc(sizeof(edge_t)); - e->weight = weight; - e->from = from; - e->to = to; - - // Do new link - e->next = old; - if( old ) { - e->prev = old->prev; - old->prev = e; - } else { e->prev = NULL; } - - if( e->prev ) { - e->prev->next = e; - } - - from->adj = e; - - return e; -} - -// For iterating edges -edge_t *edge_next(graph_t *g, edge_t *e) { - if(e == NULL || e->next == NULL ) { - // Find next index - - // Chose starting index 0 if NULL e - unsigned char i = e ? e->from->ref+1 : 0; - for( ; i < 128; i++ ) { - if( g->vertexes[i] && g->vertexes[i]->adj ) { - return g->vertexes[i]->adj; - } - } - // No next vertex - return NULL; - } - - // Not finished with this adj list - return e->next; -} - -vertex_t *vertex_next(graph_t *g, vertex_t *v) { - unsigned char ref = v ? v->ref+1 : 0; - for( ; ref < 128; ref++ ) { - if( g->vertexes[ref] ) { - return g->vertexes[ref]; - } - } - - return NULL; -} - -void graph_edge(graph_t *g, char from, char to, int weight) { - // Does a exists - if( g->vertexes[from] == NULL ) { - g->vertexes[from] = create_vertex(from); - } - // What about b - if( g->vertexes[to] == NULL ) { - g->vertexes[to] = create_vertex(to); - } - - // Add edge - create_edge(g->vertexes[from], g->vertexes[to], weight); -} - -int graph_print_adj(graph_t *g, char ref) { - if( g->vertexes[ref] == NULL ) { - return 1; - } - - edge_t *e = g->vertexes[ref]->adj; - printf("[ "); - while(e && e->from->ref == ref) { - printf("%c[%d] ", e->to->ref, e->weight); - e = e->next; - } - printf("]\n"); - - return 0; -} - -int graph_to_dot(FILE *f, graph_t *g) { - // print pre stuff - fprintf(f, "digraph coolgraph {\n"); - - // Label all nodes - vertex_t *v = vertex_next(g, NULL); - while( v ) { - fprintf(f, "%c [label=\"%c(%d)\"];\n", v->ref, v->ref, v->dist); - v = vertex_next(g, v); - } - // Print all the edges - edge_t *e = edge_next(g, NULL); - while( e ) { - fprintf(f, "%c -> %c [label = %d%s];\n", e->from->ref, e->to->ref, e->weight, e->to->p == e->from ? " color=blue" : ""); - e = edge_next(g, e); - } - - // done - fprintf(f, "}\n"); -} - diff --git a/sem1/algo/mm12/graph.h b/sem1/algo/mm12/graph.h deleted file mode 100644 index e957c4d..0000000 --- a/sem1/algo/mm12/graph.h +++ /dev/null @@ -1,34 +0,0 @@ -#ifndef GRAPH_H_ -#define GRAPH_H_ - -struct vertex_struct; - -// Linked list -typedef struct edge_struct { - int weight; - struct vertex_struct *from; - struct vertex_struct *to; - // Linked list stuff - struct edge_struct *next; - struct edge_struct *prev; -} edge_t; - -typedef struct vertex_struct { - char ref; - int dist; - struct vertex_struct *p; - edge_t *adj; -} vertex_t; - -typedef struct { - vertex_t *vertexes[128]; - -} graph_t; - -int graph_to_dot(FILE *f, graph_t *g); -int graph_print_adj(graph_t *g, char ref); -void graph_edge(graph_t *g, char from, char to, int weight); -edge_t *edge_next(graph_t *g, edge_t *e); -vertex_t *vertex_next(graph_t *g, vertex_t *v); - -#endif // GRAPH_H_ |