There are exactly N people living in a certain parallel universe. The Ith of these N people claim to be the parent of exactly Ai off these N people. However, some of these people may be lying - the person may either be telling the truth (in which case they have exactly Ai children) or lying down (in which case they can have any number of children). It is known that each person has at most one parent. Furthermore, as one would expect, a person's child is not allowed to also be their ancestor. What is the maximum possible number of truth tellers in this universe

There are exactly N people living in a certain parallel universe. The Ith of these N people claim to be the parent of exactly Ai off these N people. However, some of these people may be lying - the person may either be telling the truth (in which case they have exactly Ai children) or lying down (in which case they can have any number of children). It is known that each person has at most one parent. Furthermore, as one would expect, a person's child is not allowed to also be their ancestor. What is the maximum possible number of truth tellers in this universe

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

Problems on Turing Machines

In the computational world, the Turing machine is a powerful computation engine. The invention of the Turing Machine is done by Alan Turing in 1936. A Turing Machine (TM) is a diagrammatic model of a fictional computer. It determines an output from a set of input variables using a pre-defined set of rules. It is used to get around the limitations of finite automata and pushdown automata.

Question

Using Python programming language.
There are exactly N people living in a certain parallel universe. The Ith of these N
people claim to be the parent of exactly Ai off these N people.
However, some of these people may be lying - the person may either be telling the
truth (in which case they have exactly Ai
children) or lying down (in which case they can have any number of children).
It is known that each person has at most one parent. Furthermore, as one would
expect, a person's child is not allowed to also be their ancestor. What is the
maximum possible number of truth tellers in this universe
Required Output
2
Possible input
1
2
10

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