шаблоны функций - C++

#include <iostream>
#include <cstdlib>
#include <ctime>
 
template <class Iterator>
size_t maximalPairLength(Iterator first, Iterator last);
 
int main()
{
    std::srand((size_t)(std::time)(nullptr));
 
    size_t arraySize;
    std::cout << "N: ";
    std::cin >> arraySize;
 
    int *array = new int [arraySize];
    std::cout << "Array: " << std::endl;
    for (size_t i = 0; i < arraySize; i++) {
        std::cout << (*(array + i) = std::rand() % 5) << " ";
    }
    std::cout << std::endl << "Maximal length of pair: " << maximalPairLength(array, array + arraySize) << std::endl;
    
    delete [] array;
    std::system("pause");
    return 0;
}
 
template <class Iterator>
size_t maximalPairLength(Iterator first, Iterator last)
{
    size_t result(0);
    while (first != (last - 1)) {
        result += *first == *(first + 1) ? 1 : 0;
        first++;
    }
    return result;
}