|
1
|
|
|
from pyalgs.algorithms.commons import util |
|
2
|
|
|
from pyalgs.data_structures.commons.bag import Bag |
|
3
|
|
|
|
|
4
|
|
View Code Duplication |
|
|
|
|
|
|
|
5
|
|
|
class Graph(object): |
|
6
|
|
|
V = 0 |
|
7
|
|
|
adjList = None |
|
8
|
|
|
|
|
9
|
|
|
def __init__(self, V): |
|
10
|
|
|
self.V = V |
|
11
|
|
|
self.adjList = [None] * V |
|
12
|
|
|
for v in range(V): |
|
13
|
|
|
self.adjList[v] = Bag() |
|
14
|
|
|
|
|
15
|
|
|
def vertex_count(self): |
|
16
|
|
|
return self.V |
|
17
|
|
|
|
|
18
|
|
|
def adj(self, v): |
|
19
|
|
|
return self.adjList[v].iterate() |
|
20
|
|
|
|
|
21
|
|
|
def add_edge(self, v, w): |
|
22
|
|
|
self.adjList[v].add(w) |
|
23
|
|
|
self.adjList[w].add(v) |
|
24
|
|
|
|
|
25
|
|
View Code Duplication |
|
|
|
|
|
|
|
26
|
|
|
class Digraph(object): |
|
27
|
|
|
V = 0 |
|
28
|
|
|
adjList = None |
|
29
|
|
|
|
|
30
|
|
|
def __init__(self, V): |
|
31
|
|
|
self.V = V |
|
32
|
|
|
self.adjList = [None] * V |
|
33
|
|
|
for v in range(V): |
|
34
|
|
|
self.adjList[v] = Bag() |
|
35
|
|
|
|
|
36
|
|
|
def vertex_count(self): |
|
37
|
|
|
return self.V |
|
38
|
|
|
|
|
39
|
|
|
def adj(self, v): |
|
40
|
|
|
return self.adjList[v].iterate() |
|
41
|
|
|
|
|
42
|
|
|
def add_edge(self, v, w): |
|
43
|
|
|
self.adjList[v].add(w) |
|
44
|
|
|
|
|
45
|
|
|
def reverse(self): |
|
46
|
|
|
g = Digraph(self.V) |
|
47
|
|
|
for v in range(self.V): |
|
48
|
|
|
for w in self.adjList[v].iterate(): |
|
49
|
|
|
g.add_edge(w, v) |
|
50
|
|
|
|
|
51
|
|
|
return g |
|
52
|
|
|
|
|
53
|
|
|
|
|
54
|
|
|
class Edge(object): |
|
55
|
|
|
v = None |
|
56
|
|
|
w = None |
|
57
|
|
|
weight = 0 |
|
58
|
|
|
|
|
59
|
|
|
def __init__(self, v=None, w=None, weight=None): |
|
60
|
|
|
if weight is None: |
|
61
|
|
|
weight = 0 |
|
62
|
|
|
self.v = v |
|
63
|
|
|
self.w = w |
|
64
|
|
|
self.weight = weight |
|
65
|
|
|
|
|
66
|
|
|
def start(self): |
|
67
|
|
|
return self.v |
|
68
|
|
|
|
|
69
|
|
|
def end(self): |
|
70
|
|
|
return self.w |
|
71
|
|
|
|
|
72
|
|
|
def other(self, v): |
|
73
|
|
|
if self.v == v: |
|
74
|
|
|
return self.w |
|
75
|
|
|
elif self.w == v: |
|
76
|
|
|
return self.v |
|
77
|
|
|
else: |
|
78
|
|
|
raise ValueError('mismatched vertex detected') |
|
79
|
|
|
|
|
80
|
|
|
# use for python 2 comparison |
|
81
|
|
|
def __cmp__(self, other): |
|
82
|
|
|
return util.cmp(self.weight, other.weight) |
|
83
|
|
|
|
|
84
|
|
|
# user for python 3 comparison |
|
85
|
|
|
def __lt__(self, other): |
|
86
|
|
|
return util.less(self.weight, other.weight) |
|
87
|
|
|
|
|
88
|
|
|
# user for python 3 comparison |
|
89
|
|
|
def __gt__(self, other): |
|
90
|
|
|
return util.greater(self.weight, other.weight) |
|
91
|
|
|
|
|
92
|
|
|
def __str__(self): |
|
93
|
|
|
return str(self.v) + ' => ' + str(self.w) + ' (' + str(self.weight) + ')' |
|
94
|
|
|
|
|
95
|
|
|
|
|
96
|
|
|
class EdgeWeightedGraph(object): |
|
97
|
|
|
adjList = None |
|
98
|
|
|
V = 0 |
|
99
|
|
|
|
|
100
|
|
|
def __init__(self, vertex_count): |
|
101
|
|
|
self.V = vertex_count |
|
102
|
|
|
self.adjList = [None] * vertex_count |
|
103
|
|
|
for v in range(vertex_count): |
|
104
|
|
|
self.adjList[v] = Bag() |
|
105
|
|
|
|
|
106
|
|
|
def add_edge(self, edge): |
|
107
|
|
|
v = edge.start() |
|
108
|
|
|
w = edge.end() |
|
109
|
|
|
self.adjList[v].add(edge) |
|
110
|
|
|
self.adjList[w].add(edge) |
|
111
|
|
|
|
|
112
|
|
|
def adj(self, v): |
|
113
|
|
|
return self.adjList[v].iterate() |
|
114
|
|
|
|
|
115
|
|
|
def vertex_count(self): |
|
116
|
|
|
return self.V |
|
117
|
|
|
|
|
118
|
|
|
def edges(self): |
|
119
|
|
|
for v in range(self.V): |
|
120
|
|
|
for e in self.adj(v): |
|
121
|
|
|
if e.start() == v: |
|
122
|
|
|
yield e |
|
123
|
|
|
|
|
124
|
|
|
def to_graph(self): |
|
125
|
|
|
g = Graph() |
|
126
|
|
|
|
|
127
|
|
|
for e in self.edges(): |
|
128
|
|
|
g.add_edge(e.start(), e.end()) |
|
129
|
|
|
return g |
|
130
|
|
|
|
|
131
|
|
|
|
chen0040 /
pyalgs
Loading history...