Recall the breadth search first (bfs) algorithm discussed in class, presented below: def bfs (g, s): q, visited - (s), [) while q: u- q. pop (0) visited. append (u) for v in glu]: if v not in visited + q: q. append (v) return visited a) The above simple version just returns a list of nodes in order visited by the algorithm. Below is a slightly modified, but incomplete, version of bfs(), which "returns" (or produces) the same information in global variable visited, and also updates a dictionary prev, which records for each node the previous node in the path to it found by the algorithm; for example, where F is the starting node with no previous node (-) to it:

Recall the breadth search first (bfs) algorithm discussed in class, presented below: def bfs (g, s): q, visited - (s), [) while q: u- q. pop (0) visited. append (u) for v in glu]: if v not in visited + q: q. append (v) return visited a) The above simple version just returns a list of nodes in order visited by the algorithm. Below is a slightly modified, but incomplete, version of bfs(), which "returns" (or produces) the same information in global variable visited, and also updates a dictionary prev, which records for each node the previous node in the path to it found by the algorithm; for example, where F is the starting node with no previous node (-) to it:

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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