# Template for initiliazing and populating a graph
class graph:
    def __init__(self):
        self.graph_list = {}

    def initializing_graph(self, dependencies):
        for x in dependencies:
            parent, child = x[1], x[0]
            self.graph[parent], self.graph[child] = [], []
    
    def building_graph(self, dependencies):
        for dependency in dependencies:
            parent, child = dependency[1], dependency[0]
            self.graph[parent].append(child)