137 lines
2.8 KiB
Plaintext
137 lines
2.8 KiB
Plaintext
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/* file name: topologicalSort.c */
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/* <20>ݾ<EFBFBD><DDBE>Ƨ<EFBFBD> */
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#include <stdio.h>
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#include <stdlib.h>
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#define MAX_V 100 /* <20>̤j<CCA4>`<60>I<EFBFBD><49> */
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#define TRUE 1
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#define FALSE 0
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/*<2A>w<EFBFBD>q<EFBFBD><71><EFBFBD>Ƶ<EFBFBD><C6B5>c*/
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typedef struct node_tag {
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int vertex;
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struct node_tag *link;
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} Node;
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Node *adjlist[MAX_V+1]; /* <20>ŧi<C5A7>۾F<DBBE><46><EFBFBD>C */
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int visited[MAX_V+1]; /* <20>O<EFBFBD><4F><EFBFBD><EFBFBD><EFBFBD>I<EFBFBD>O<EFBFBD>_<EFBFBD>w<EFBFBD><77><EFBFBD>X */
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int Top_order[MAX_V+1];
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int N;
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int place;
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void build_adjlist(void);
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void show_adjlist(void);
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void topological(void);
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void top_sort(int);
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Node *searchlast(Node *);
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int main()
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{
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int i;
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build_adjlist(); /* <20>H<EFBFBD>۾F<DBBE><46><EFBFBD>C<EFBFBD><43><EFBFBD>ܹϧ<DCB9> */
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show_adjlist(); /* <20><><EFBFBD>ܦ<EFBFBD><DCA6>C<EFBFBD><43><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
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topological(); /* <20>ϧΤ<CFA7><CEA4>ܦV<DCA6>u<EFBFBD><75><EFBFBD>j<EFBFBD>M<EFBFBD>A<EFBFBD>H<EFBFBD><48><EFBFBD>I 1 <20><><EFBFBD>ҩl<D2A9><6C><EFBFBD>I */
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puts("\n------Topological sort------");
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for (i = 0; i < N; i++)
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printf("V%d ", Top_order[i]);
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printf("\n");
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return 0;
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}
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void build_adjlist()
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{
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FILE *fptr;
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Node *node, *lastnode;
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int vi, vj;
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fptr = fopen("topologicalSort.dat", "r");
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if (fptr == NULL) {
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perror("topologicalSort.dat");
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exit(0);
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}
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/* Ū<><C5AA><EFBFBD>`<60>I<EFBFBD>`<60><> */
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fscanf(fptr, "%d", &N);
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for (vi = 1; vi <= N; vi++) {
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/* <20>]<5D>w<EFBFBD>}<7D>C<EFBFBD>ΦU<CEA6><55><EFBFBD>C<EFBFBD>ҩl<D2A9><6C> */
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adjlist[vi] = (Node *)malloc(sizeof(Node));
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adjlist[vi]->vertex = vi;
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adjlist[vi]->link = NULL;
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}
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/* Ū<><C5AA><EFBFBD>`<60>I<EFBFBD><49><EFBFBD><EFBFBD> */
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while (fscanf(fptr,"%d %d",&vi,&vj) != EOF) {
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node = (Node *)malloc(sizeof(Node));
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node->vertex = vj;
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node->link = NULL;
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if (adjlist[vi]->link == NULL)
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adjlist[vi]->link = node;
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else {
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lastnode = searchlast(adjlist[vi]);
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lastnode->link = node;
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}
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}
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fclose(fptr);
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}
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/* <20><><EFBFBD>ܦU<DCA6>۾F<DBBE><46><EFBFBD>C<EFBFBD><43><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
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void show_adjlist()
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{
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int v;
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Node *ptr;
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puts("Head adjacency nodes");
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puts("--------------------------");
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for (v = 1; v <= N; v++) {
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printf("V%d ",adjlist[v]->vertex);
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ptr = adjlist[v]->link;
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while (ptr != NULL) {
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printf("--> V%d ",ptr->vertex);
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ptr = ptr->link;
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}
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printf("\n");
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}
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}
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/* <20>ϧΤ<CFA7><CEA4>ܦV<DCA6>u<EFBFBD><75><EFBFBD>j<EFBFBD>M */
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void topological()
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{
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int v;
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for (v = 1; v <= N; v++)
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visited[v] = FALSE;
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place = N;
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for (v = 1; v <= N; v++)
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if (!visited[v])
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top_sort(v);
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}
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void top_sort(int k)
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{
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Node *ptr;
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int w;
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visited[k] = TRUE; /* <20>]<5D>w v <20><><EFBFBD>I<EFBFBD><49><EFBFBD>w<EFBFBD><77><EFBFBD>X<EFBFBD>L */
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ptr = adjlist[k]->link; /* <20><><EFBFBD>X v <20>۾F<DBBE><46><EFBFBD>I */
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while (ptr != NULL) {
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w = ptr->vertex; /* w <20><> v <20><><EFBFBD>ߧY<DFA7><59><EFBFBD>~<7E><> */
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if (!visited[w])
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top_sort(w);
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ptr = ptr->link;
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}
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Top_order[--place] = k;
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}
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/* <20>j<EFBFBD>M<EFBFBD><4D><EFBFBD>C<EFBFBD>̫<EFBFBD><CCAB>`<60>I<EFBFBD><49><EFBFBD><EFBFBD> */
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Node *searchlast(Node *linklist)
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{
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Node *ptr;
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ptr = linklist;
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while (ptr->link != NULL)
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ptr = ptr->link;
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return ptr;
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}
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