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7aaf79cc23
* Update dfs.py
* Add type hints, rearrange doc-strings and comments
* fixup! Format Python code with psf/black push
* dfs -> depth_first_search
Co-Authored-By: Christian Clauss <cclauss@me.com>
* dfs -> depth_first_search
* Add doctest for DFS
* fixup! Format Python code with psf/black push
* Rename dfs.py to depth_first_search_dictionary.py
* updating DIRECTORY.md
* Rename depth_first_search_dictionary.py to depth_first_search_dfs.py
* updating DIRECTORY.md
* Rename depth_first_search.py to depth_first_search_2.py
* updating DIRECTORY.md
* Rename depth_first_search_dfs.py to depth_first_search.py
* updating DIRECTORY.md
Co-authored-by: John Law <johnlaw.po@gmail.com>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
66 lines
1.6 KiB
Python
66 lines
1.6 KiB
Python
#!/usr/bin/python
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""" Author: OMKAR PATHAK """
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class Graph:
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def __init__(self):
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self.vertex = {}
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# for printing the Graph vertices
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def printGraph(self):
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print(self.vertex)
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for i in self.vertex.keys():
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print(i, " -> ", " -> ".join([str(j) for j in self.vertex[i]]))
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# for adding the edge between two vertices
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def addEdge(self, fromVertex, toVertex):
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# check if vertex is already present,
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if fromVertex in self.vertex.keys():
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self.vertex[fromVertex].append(toVertex)
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else:
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# else make a new vertex
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self.vertex[fromVertex] = [toVertex]
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def DFS(self):
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# visited array for storing already visited nodes
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visited = [False] * len(self.vertex)
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# call the recursive helper function
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for i in range(len(self.vertex)):
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if visited[i] == False:
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self.DFSRec(i, visited)
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def DFSRec(self, startVertex, visited):
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# mark start vertex as visited
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visited[startVertex] = True
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print(startVertex, end=" ")
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# Recur for all the vertices that are adjacent to this node
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for i in self.vertex.keys():
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if visited[i] == False:
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self.DFSRec(i, visited)
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if __name__ == "__main__":
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g = Graph()
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g.addEdge(0, 1)
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g.addEdge(0, 2)
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g.addEdge(1, 2)
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g.addEdge(2, 0)
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g.addEdge(2, 3)
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g.addEdge(3, 3)
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g.printGraph()
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print("DFS:")
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g.DFS()
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# OUTPUT:
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# 0 -> 1 -> 2
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# 1 -> 2
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# 2 -> 0 -> 3
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# 3 -> 3
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# DFS:
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# 0 1 2 3
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