def test_color_4_nodes_2():
#"""
#a-b
#|\|
#d-c
#"""
g = Ungraph.from_neigh_list({
"a": ["b", "c", "d"], "b": ["a", "c"], "c": ["a", "b", "d"], "d": ["a", "c"]
})
assert_coloring(g, 5, [('a', 2), ('b', 0), ('c', 1), ('d', 0)])
def test_appel_2ed_p221():
# "Graph from MCIiJ p.221"
NEIGHS = {
"j": ["f", "e", "k", "d", "h", "g"],
"f": ["j", "e", "m"],
"e": ["j", "f", "m", "b"],
"m": ["f", "e", "b", "c"],
"b": ["k", "e", "m", "c", "d"],
"m": ["b", "e", "f", "d", "c"],
"k": ["j", "b", "d", "g"],
"h": ["j", "g"],
"g": ["h", "k", "j"],
"d": ["j", "k", "b", "m"],
"c": ["b", "m"],
}
g = Ungraph.from_neigh_list(NEIGHS)
assert_coloring(g, 4,
[('b', 1), ('c', 2), ('d', 2), ('e', 2), ('f', 3), ('g', 2), ('h', 0), ('j', 1), ('k', 0), ('m', 0)]
)
def test_color_2_nodes():
g = Ungraph.from_neigh_list({"a": ["b"], "b": ["a"]})
assert_coloring(g, 5, [("a", 1), ("b", 0)])
def test_color_3_nodes():
g = Ungraph.from_neigh_list({"a": ["b", "c"], "b": ["a", "c"], "c": ["a", "b"]})
assert_coloring(g, 5, [('a', 2), ('b', 1), ('c', 0)])
def test_color_1_node():
g = Ungraph.from_neigh_list({"a": []})
assert_coloring(g, 5, [("a", 0)])