82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* bfs.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: tmaze <tmaze@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2019/03/27 14:41:49 by tmaze #+# #+# */
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/* Updated: 2019/04/05 13:24:22 by tmaze ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "lem_in.h"
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static void bfs_addtoqueue(t_bfs *tab, int node, int nb_nodes)
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{
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int i;
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i = 0;
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if (tab[node].visited == 0)
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{
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while (i < nb_nodes && tab[i].queue != -1 && tab[i].queue != node)
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i++;
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if (i < nb_nodes && tab[i].queue == -1)
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tab[i].queue = node;
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}
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}
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static void bfs_checkadj(t_lmdata *data, t_bfs *tab, int i)
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{
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t_ind *it;
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char used;
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it = data->adj[tab[i].queue];
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used = 0;
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while (it != NULL)
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{
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if (tab[it->index].visited == 0 && it->weight == 2)
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used = 1;
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if (tab[it->index].visited == 0 && it->weight == 2)
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break ;
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it = it->next;
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}
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it = data->adj[tab[i].queue];
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while (it != NULL)
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{
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if (tab[it->index].visited == 0 && ((!used && it->weight > 0)
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|| (used && it->weight == 2)))
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bfs_addtoqueue(tab, it->index, data->nb_nodes);
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if (tab[it->index].visited == 0 && ((!used && it->weight > 0)
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|| (used && it->weight == 2)))
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tab[it->index].parent = tab[i].queue;
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it = it->next;
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}
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}
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static void bfs_init(t_bfs *tab, t_lmdata *data)
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{
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int i;
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i = 0;
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while (i < data->nb_nodes)
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{
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tab[i].parent = -1;
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tab[i].visited = 0;
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tab[i].queue = -1;
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i++;
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}
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}
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void bfs(t_lmdata *data, t_bfs *tab, int start_ind, int end_ind)
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{
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int i;
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bfs_init(tab, data);
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bfs_addtoqueue(tab, start_ind, data->nb_nodes);
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i = 0;
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while (i < data->nb_nodes && tab[i].queue != -1
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&& tab[end_ind].parent == -1 && (tab[tab[i].queue].visited = 1))
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bfs_checkadj(data, tab, i++);
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}
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