Answered: Implement the following function that…

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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Implement the following function that returns a vector of vectors of Item, each of which is a subset of elements chosen from the given vector a[first…last]:

/* if a is {1,2,3}, first=0, last=2, the function shall returns a vector of the following vectors:

{}, {1}, {2}, {3}, {1,2},{1,3}, {2,3},{1,2,3}, all subsets of a[0…2].

Precondition: last-first+1>=1, i.e., there is at least one element in the a[first…last]

Note 1)if the length of a[first…last] is n, then the function should return a vector of 2ⁿ vectors

2) The order of these subsets does not need to match what’s listed here…

vector<vector<int>> subsets (const vector<int> & a, int first, int last)

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