Introduction to Sets HackerRank Solution In Python

Problem

A set is an unordered collection of elements without duplicate entries.

When printed, iterated or converted into a sequence, its elements will appear in an arbitrary order.

Example

>>> print set()set([])>>> print set('HackerRank')set(['a', 'c', 'e', 'H', 'k', 'n', 'r', 'R'])>>> print set([1,2,1,2,3,4,5,6,0,9,12,22,3])set([0, 1, 2, 3, 4, 5, 6, 9, 12, 22])>>> print set((1,2,3,4,5,5))set([1, 2, 3, 4, 5])>>> print set(set(['H','a','c','k','e','r','r','a','n','k']))set(['a', 'c', 'r', 'e', 'H', 'k', 'n'])>>> print set({'Hacker' : 'DOSHI', 'Rank' : 616 })set(['Hacker', 'Rank'])>>> print set(enumerate(['H','a','c','k','e','r','r','a','n','k']))set([(6, 'r'), (7, 'a'), (3, 'k'), (4, 'e'), (5, 'r'), (9, 'k'), (2, 'c'), (0, 'H'), (1, 'a'), (8, 'n')])

Basically, sets are used for membership testing and eliminating duplicate entries.

Task

Now, let’s use our knowledge of sets and help Mickey.

Ms. Gabriel Williams is a botany professor at District College. One day, she asked her student Mickey to compute the average of all the plants with distinct heights in her greenhouse.

Formula used:

Average = Sum of Distint Heights/Total Number of Distint Heights

Function Discription

Complete the average function in the editor below.

average has the following parameters:

• int arr: an array of integers

Returns

• float: the resulting float value rounded to 3 places after the decimal

Input Format

• Zeros and Ones HackerRank Solution In Python
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• Floor, Ceil and Rint HackerRank Solution In Python
• Sum and Prod HackerRank Solution In Python

The first line contains the integer, N, the size of .
The second line contains the N space-separated integers, arr[i].

Constraints

0 ≤ N ≤ 100

Sample Input

STDIN                                       Function-----                                       --------10                                          arr[] size N = 10161 182 161 154 176 170 167 171 170 174     arr = [161, 181, ..., 174]

Sample Output

169.375

Explanation

Here, set([154, 161, 167, 170, 171, 174, 176, 182]) is the set containing the distinct heights. Using the sum() and len() functions, we can compute the average.

Average = 1355/8 = 169.375

Solution to HackerRank Introduction to Sets

In this problem, we are to find the avarage of the numbers with didtinct values.

def average(array):    # your code goes here    distint_height = set(array)    aver = sum(distint_height)/len(distint_height)    return averif __name__ == '__main__':    n = int(input())    arr = list(map(int, input().split()))    result = average(arr)    print(result)