This notebook was prepared by Donne Martin. Source and license info is on GitHub.
Input:
add_edge(source, destination, weight)
graph.add_edge(0, 1, 5)
graph.add_edge(0, 4, 3)
graph.add_edge(0, 5, 2)
graph.add_edge(1, 3, 5)
graph.add_edge(1, 4, 4)
graph.add_edge(2, 1, 6)
graph.add_edge(3, 2, 7)
graph.add_edge(3, 4, 8)
Result:
Refer to the Solution Notebook. If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start.
%run ../graph/graph.py
%load ../graph/graph.py
class GraphDfs(Graph):
def dfs(self, root, visit_func):
# TODO: Implement me
pass
The following unit test is expected to fail until you solve the challenge.
%run ../utils/results.py
# %load test_dfs.py
import unittest
class TestDfs(unittest.TestCase):
def __init__(self, *args, **kwargs):
super(TestDfs, self).__init__()
self.results = Results()
def test_dfs(self):
nodes = []
graph = GraphDfs()
for id in range(0, 6):
nodes.append(graph.add_node(id))
graph.add_edge(0, 1, 5)
graph.add_edge(0, 4, 3)
graph.add_edge(0, 5, 2)
graph.add_edge(1, 3, 5)
graph.add_edge(1, 4, 4)
graph.add_edge(2, 1, 6)
graph.add_edge(3, 2, 7)
graph.add_edge(3, 4, 8)
graph.dfs(nodes[0], self.results.add_result)
self.assertEqual(str(self.results), "[0, 1, 3, 2, 4, 5]")
print('Success: test_dfs')
def main():
test = TestDfs()
test.test_dfs()
if __name__ == '__main__':
main()
Review the Solution Notebook for a discussion on algorithms and code solutions.