Solved-A6- Solution

Description

Hackerrank Link: https://www.hackerrank.com/cs2810-ooaia-a6

1 Objective

Learning the basics of Functors (Function objects) and its applications.

2 Problem Statement

Create a class in C++ for representing the students. The class should have following attributes.

Name of the student (may contain duplicates) Roll number (Unique integer)

Scores they get in three subjects(Physics, Chemistry, Maths) some other supportive attributes of your choice

There are 3 type of operations to perform using only Functors.

1. Find student details, given the roll number

2. Find all the students given the name. Return the students sorted by the roll number.

3. Find the average score of all the students. Return the students sorted rst by the decreasing average score then by the roll number.

3 Input Format

First line contains the number of students n.

Following n lines will have the details of each student in the given form

hnameihspaceihrollno:ihspaceihP hysicsmarksihspaceihChemistrymarksihspaceihM athsmarksi

After which a single operation number is given along with input required for particular operation.

1

4 Output Format

For operation 1: print the details of the student with given roll number, same as in input format. In case of roll number not present in input print “Invalid Entry”

For operation 2: print the details of the students in separate lines with the given name in separate lines, sorted according to their roll numbers. In case of name not present in input print “Invalid Entry”

For operation 3: print the details of the students along with the average marks in separate lines, sorted in decreasing order of average marks then by the roll number. (print average marks to four decimal place).

5 Constraints

Number of students(n): 1 n 100

Subject marks(m): 0 m 100

Roll number (r): 1 r 100

6 Sample Testcase

Input 1:

5

Akshay 14 78 85 67

Sahil 32 89 76 90

Suzain 36 56 71 65

Priya 29 89 80 99

Sonu 39 84 75 95

1 38 Output 1: Invalid Entry

Input 2:

8 Akshay 14 78 85 67

Sahil 32 89 76 90

Priya 29 89 80 99

Sonu 39 84 75 95

Akshay 15 65 80 74

Manav 23 59 83 70

Akshay 13 78 67 85

Shubham 34 92 85 95

2 Akshay

Output 2:

2

Akshay 13 78 67 85

Akshay 14 78 85 67

Akshay 15 65 80 74

Input 3:

10

Akshay 14 78 85 67

Sahil 32 89 76 90

Suzain 36 56 71 65

Priya 29 89 80 99

Sonu 39 84 75 95

Akshay 15 65 80 74

Manav 23 59 83 70

Akshay 13 78 67 85

Sahil 31 67 76 86

Shubham 34 92 85 95

3

Output 3:

Shubham 34 92 85 95 90.6667

Priya 29 89 80 99 89.3333

Sahil 32 89 76 90 85.0000

Sonu 39 84 75 95 84.6667

Akshay 13 78 67 85 76.6667

Akshay 14 78 85 67 76.6667

Sahil 31 67 76 86 76.3333

Akshay 15 65 80 74 73.0000

Manav 23 59 83 70 70.6667

Suzain 36 56 71 65 64.0000

7 Design submission format

For the design submission on Moodle, please submit tar.gz le named as your roll number.

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