File: root - text - article - 2020 - 02 - reverse-a-directed-graph.txt
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Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Category: Computing | 517 Views, 23597 Search Bots | 115 Words
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Hi, here's your problem today. This problem was recently asked by Facebook:
Given a directed graph, reverse the directed graph so all directed edges are reversed.
Example:
Input:
A -> B, B -> C, A ->C
Output:
B->A, C -> B, C -> A
Here's a starting point:
Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | Home Page | Cateogry: Computing | 517 Views, 23597 Search Bots | 115 Words Given a directed graph, reverse the directed graph so all directed edges are reversed.
Example:
Input:
A -> B, B -> C, A ->C
Output:
B->A, C -> B, C -> A
Here's a starting point:
from collections import defaultdict
class Node:
def __init__(self, value):
self.adjacent = []
self.value = value
def reverse_graph(graph):
# Fill this in.
a = Node('a')
b = Node('b')
c = Node('c')
a.adjacent += [b, c]
b.adjacent += [c]
graph = {
a.value: a,
b.value: b,
c.value: c,
}
for _, val in reverse_graph(graph).items():
print(val.adjacent)
# []
# ['a', 'b']
# ['a']
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