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45 lines
1020 B
Python
45 lines
1020 B
Python
#!/usr/bin/python
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# Author: OMKAR PATHAK
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# We can use Python's dictionary for constructing the graph.
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class AdjacencyList:
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def __init__(self):
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self.adj_list = {}
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def add_edge(self, from_vertex: int, to_vertex: int) -> None:
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# check if vertex is already present
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if from_vertex in self.adj_list:
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self.adj_list[from_vertex].append(to_vertex)
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else:
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self.adj_list[from_vertex] = [to_vertex]
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def print_list(self) -> None:
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for i in self.adj_list:
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print((i, "->", " -> ".join([str(j) for j in self.adj_list[i]])))
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if __name__ == "__main__":
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al = AdjacencyList()
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al.add_edge(0, 1)
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al.add_edge(0, 4)
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al.add_edge(4, 1)
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al.add_edge(4, 3)
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al.add_edge(1, 0)
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al.add_edge(1, 4)
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al.add_edge(1, 3)
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al.add_edge(1, 2)
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al.add_edge(2, 3)
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al.add_edge(3, 4)
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al.print_list()
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# OUTPUT:
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# 0 -> 1 -> 4
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# 1 -> 0 -> 4 -> 3 -> 2
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# 2 -> 3
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# 3 -> 4
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# 4 -> 1 -> 3
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