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#!/usr/bin/python

# encoding=utf8

from __future__ import print_function

# Author: OMKAR PATHAK

# We can use Python's dictionary for constructing the graph

class AdjacencyList(object):

def __init__(self):

self.List = {}

def addEdge(self, fromVertex, toVertex):

# check if vertex is already present

if fromVertex in self.List.keys():

self.List[fromVertex].append(toVertex)

else:

self.List[fromVertex] = [toVertex]

def printList(self):

for i in self.List:

print((i,'->',' -> '.join([str(j) for j in self.List[i]])))

if __name__ == '__main__':

al = AdjacencyList()

al.addEdge(0, 1)

al.addEdge(0, 4)

al.addEdge(4, 1)

al.addEdge(4, 3)

al.addEdge(1, 0)

al.addEdge(1, 4)

al.addEdge(1, 3)

al.addEdge(1, 2)

al.addEdge(2, 3)

al.addEdge(3, 4)

al.printList()

# OUTPUT:

# 0 -> 1 -> 4

# 1 -> 0 -> 4 -> 3 -> 2

# 2 -> 3

# 3 -> 4

# 4 -> 1 -> 3

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