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topsort.c
资源名称:leda.tar.gz [点击查看]
上传用户:gzelex
上传日期:2007-01-07
资源大小:707k
文件大小:1k
源码类别:
数值算法/人工智能
开发平台:
MultiPlatform
- #include <LEDA/graph.h>
- #include <LEDA/graph_edit.h>
- bool TOPSORT(const graph& G, node_array<int>& ord)
- {
- node_array<int> cur_indeg(G);
- list<node> zero_indeg;
- int count = 0;
- node v,w;
- forall_nodes(v,G)
- { cur_indeg[v] = G.indeg(v);
- if (G.indeg(v)==0)
- zero_indeg.append(v);
- }
- while ( ! zero_indeg.empty() )
- {
- count++;
- v = zero_indeg.pop();
- ord[v] = count;
- forall_adj_nodes(w,v)
- if (--cur_indeg[w]==0) zero_indeg.append(w);
- }
- return (count==G.number_of_nodes());
- }
- main()
- {
- GRAPH<point,int> G;
- window W;
- for(;;)
- {
- graph_edit(W,G);
- node_array<int> node_num(G);
- if (TOPSORT(G,node_num)==false)
- { W.acknowledge("Graph is cyclic, cannot sort");
- continue;
- }
- node v;
- forall_nodes(v,G)
- W.draw_int_node(G[v],node_num[v],blue);
- if (W.read_mouse() == 3) break;
- }
- return 0;
- }