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.
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 Distinct Heights/Total Number of Distinct Heights
Function Description
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
The first line contains the integer, N the size of arr
The second line contains the N space-separated integer, arr[i].
Sample input
STDIN Function
----- --------
10 arr[] size N = 10
161 182 161 154 176 170 167 171 170 174 arr = [161, 181, ..., 174]
Sample Output
169.375
Explanation
Here, set ([154, 161, 167, 170, 171, 174, 176, 182]0 is the set containing the distinct heights. Using the sum() and len() functions, we can compute the average.
Average = 1355/8 = 169.375
Introduction to Sets Python Solution
def average(array):
sum_array = sum(set(array))
len_array = len(set(array))
output = sum_array/len_array
return output;
if __name__ == '__main__':
n = int(input())
arr = list(map(int, input().split()))
result = average(arr)
print(result)
