Given an unsorted array of n integers which can contains n integers. Count frequency of all elements that are present in array.
Input : arr = [1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 4, 5, 5] Output : 1 -> 4 2 -> 4 3 -> 2 4 -> 1 5 -> 2
1 -> 4 2 -> 4 3 -> 2 4 -> 1 5 -> 2
Related Article :
Counting the frequencies in a list using dictionary in Python
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