4) do it in C++ language : 4. Given two unsorted arrays of integer numbers, write a function which returns number of elements that exist

4) do it in C++ language : 4. Given two unsorted arrays of integer numbers, write a function which returns number of
elements that exist in both arrays. Elements may be repeated in any of the arrays, and all
common appearances should be counted.
Example: Suppose that the first array is 3, 1, 4, 1, 2 and the second array is 5, 1, 2, 4, 2, 1.
Common elements of the two arrays are 1, 1 and 2, and therefore the function should return
result 3.

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