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Exercise
Given an Integer arr, count how many elements x there are, such that x is also in arr. If there're duplicates in arr, count them separately.
Example 1
Input: arr = [1,2,3]
Output: 2
Explanation:
There are 2 such elements. 1 and 2 because 2 and 3 are also in the array.
Example 2
Input: arr = [1,1,3,3,5,5,7,7]
Output: 0
Explanation:
There's no such number because 2, 4, 6 or 8 is not present in the array.
Example 3
Input: arr = [1,3,2,3,5,0]
Output: 0
Explanation:
There's no such number because 2, 4, 6 or 8 is not present in the array.
Example 4
Input: arr = [1,1,2,2]
Output: 2
Explanation:
There are 2 such numbers, and 1 and 1 because 2 is in the array and duplicates are counted separately.
Example 5
Input: arr = [1,1,2]
Output: 2
Explanation:
There are 2 such numbers, and 1 and 1 because 2 is in the array and duplicates are counted separately.