Count distinct elements in an array in Python
Given an unsorted array, count all distinct elements in it.
Examples:
Input : arr[] = {10, 20, 20, 10, 30, 10}
Output : 3
Input : arr[] = {10, 20, 20, 10, 20}
Output : 2
We have existing solution for this article. We can solve this problem in Python3 using Counter method.
from collections import Counter def countDistinct(arr): # counter method gives dictionary of elements in list # with their corresponding frequency. # using keys() method of dictionary data structure # we can count distinct values in array return len(Counter(arr).keys()) if __name__=="__main__": arr = [10, 20, 20, 10, 30, 10] print (countDistinct(arr)) |
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