Exercise #1 • Derive a Python recursive function to verify if all the elements in positions 0...N-1 of a list of integers (A) are digits (betwee O and 9). • The function takes two parameters, a reference to the list and an integer that is initially the size of the list. • How to make the call in the main program?

Exercise #1 • Derive a Python recursive function to verify if all the elements in positions 0...N-1 of a list of integers (A) are digits (betwee O and 9). • The function takes two parameters, a reference to the list and an integer that is initially the size of the list. • How to make the call in the main program?

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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Concept explainers

Depth First Search

Depth-first search (DFS) also known as Depth First traversal is an algorithm used to traverse or search the nodes in a tree or graph data structure. Traversal usually means visiting all the nodes of a graph. DFS performs in a depth-ward manner. It uses a stack to remember the vertices it has visited. The search starts from the root node, where any arbitrary node is selected as a root node in a graph, and then each node is explored along each branch before performing backtracking. The DFS algorithm uses a recursive technique by following the idea of backtracking. DFS algorithm does this by performing an in-depth search of all the nodes by traversing in a forward direction. If the required node is not found, it starts backtracking to previously visited nodes.

Question

Please right your own code with some commentary.

vérifChiffres ([1,2,3,4,5],5)
True
vérifChiffres([1,2,3,4,-5],5)
False

Exercise #1
• Derive a Python recursive function to verify if all the
elements in positions 0...N-1 of a list of integers (A)
are digits (betwee 0 and 9).
• The function takes two parameters, a reference to
the list and an integer that is initially the size of the
list.
• How to make the call in the main program?

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