Part 2We want to find a valid ordering for a graph or determine that no such ordering exists. We'll usedepth-first search to do it. Notice that the pseudocode we've given you has only odd linenumbers. We'll adapt DFS to our purpose by adding two even numbered lines. Note: This is DFS ina directed graph. The edge (v, w) is directed from v to w.19 DFSValid (G) {212325272931333537 }unmark all vertices.unmark all edgesfor each vertex v {5153555759}if v is unmarked {DFS (G,V)}}return seq39 DFS (G, v) {41mark v43for each edge (v,w) {45if w is unmarked {4749}mark (v,w) TREEDFS (G,w)} else if (v,w) is unmarked {mark (v,w) NONTREE}Note that seq is a global variable that is initially an empty list. At what even line number should weaddadd v to front of seqso seq, returned by a call to DFSValid (G), is a valid ordering of G (if one exists)?Line= integerAt what even line number should we addif w not in seq then failso DFS fails if the graph has no valid ordering? Note: multiple line numbers are possible locations.Enter the first possible line number.Line=integer?

The question under consideration is "Determining Valid Orderings in a Directed Graph Using…

so seq, returned by a call to DFSValid (G), is a valid ordering of G (if one exists)? Line= integer ? At what even line number should we add if w not in seq then fail so DFS fails if the graph has no valid ordering? Note: multiple line numbers are possible locations. Enter the first possible line number. Line= integer ?

so seq, returned by a call to DFSValid (G), is a valid ordering of G (if one exists)? Line= integer ? At what even line number should we add if w not in seq then fail so DFS fails if the graph has no valid ordering? Note: multiple line numbers are possible locations. Enter the first possible line number. Line= integer ?

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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