Answered: if count[u] ==0] # Valid intial nodes S…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Redesign the topsort algorithm below so that it selects the last node in each iteration rather than the first.

def topsort(G):
count = dict((u, 0) for u in G) # The in-degree for each node
for u in G:
for v in G[u]:
count[v] += 1 # Count every in-edge
Q = [u for u in G if count[u] ==0] # Valid intial nodes
S = [] # The result
while Q: # While we have start nodes...
u = Q.pop() # Pick one
S.append(u) # Use it as first of the rest
for v in G[u]:
count[v] -= 1 # "Uncount" its out-edges
if count[v] == 0: # New valid start nodes?
Q.append(v) # Deal with them next
return S

Expert Solution

Program Explanation

Define function iterative_dfs with graph, start (Starting node) as the parameters.
Define variable start which shall store the starting node
Use while loop to choose the last node in every iteration with .pop(-1)
Use nested if condition to find the path of the graph
Call function and print the output

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