1 | // -*- c++ -*- |
---|
2 | #ifndef HUGO_BFS_DFS_MISC_H |
---|
3 | #define HUGO_BFS_DFS_MISC_H |
---|
4 | |
---|
5 | #include <bfs_iterator.h> |
---|
6 | #include <for_each_macros.h> |
---|
7 | |
---|
8 | namespace hugo { |
---|
9 | |
---|
10 | /// This function eat a read-write \c BoolMap& bool_map, |
---|
11 | /// which have to work well up |
---|
12 | /// to its \c set and \c operator[]() method. Thus we have to deal |
---|
13 | /// very carefully with an uninitialized \c IterableBoolMap. |
---|
14 | template<typename Graph, typename BoolMap> |
---|
15 | bool isBipartite(const Graph& g, BoolMap& bool_map) { |
---|
16 | typedef typename Graph::template NodeMap<bool> ReachedMap; |
---|
17 | ReachedMap reached(g/*, false*/); |
---|
18 | BfsIterator<Graph, ReachedMap> bfs(g, reached); |
---|
19 | FOR_EACH_LOC(typename Graph::NodeIt, n, g) { |
---|
20 | if (!reached[n]) { |
---|
21 | bfs.pushAndSetReached(n); |
---|
22 | bool_map.set(n, false) { |
---|
23 | while (!bfs.finished()) { |
---|
24 | if (bfs.isBNodeNewlyReached()) { |
---|
25 | bool_map.set(bfs.bNode())=!bfs.aNode(); |
---|
26 | } else { |
---|
27 | if (bool_map[bfs.bNode()]==bool_map[bfs.aNode()]) { |
---|
28 | return false; |
---|
29 | } |
---|
30 | } |
---|
31 | ++bfs; |
---|
32 | } |
---|
33 | } |
---|
34 | } |
---|
35 | } |
---|
36 | return true; |
---|
37 | } |
---|
38 | |
---|
39 | /// experimental topsort, |
---|
40 | /// I think the final version will work as an iterator |
---|
41 | template<typename Graph> |
---|
42 | void topSort(Graph& g, std::list<typename Graph::Node>& l) { |
---|
43 | l.clear(); |
---|
44 | typedef typename Graph::template NodeMap<bool> ReachedMap; |
---|
45 | ReachedMap reached(g/*, false*/); |
---|
46 | DfsIterator<Graph, ReachedMap> dfs(g, reached); |
---|
47 | FOR_EACH_LOC(typename Graph::NodeIt, n, g) { |
---|
48 | if (!reached[n]) { |
---|
49 | dfs.pushAndSetReached(n); |
---|
50 | while (!dfs.finished()) { |
---|
51 | if (dfs.isANodeExamined()) { |
---|
52 | l.push_back(dfs.aNode()); |
---|
53 | } |
---|
54 | ++dfs; |
---|
55 | } |
---|
56 | } |
---|
57 | } |
---|
58 | } |
---|
59 | } //namespace hugo |
---|
60 | |
---|
61 | #endif //HUGO_BFS_DFS_MISC_H |
---|