Определить два идущих подряд нулевых элемента

int* C = new int[N];
...
bool flag = false;
for (int* p = C + 1; p != C + N; p++) {
    if (*(p - 1) == *p && *p == 0) {
        flag = true;
        break;
    }
}
...
delete[] C;

#include <iostream>
#include <algorithm>
#include <iterator>
#include <memory>
 
template <typename It>
bool HasTwoAdjastedZeros(It begin, It end) {
  auto position_of_two_adjasted_zeros = std::search_n(begin, end, 2, 0);
  return position_of_two_adjasted_zeros != end;
}
 
template <typename It>
void ShowArray(It begin, It end) {
  std::cout << "Array:\n";
  std::copy(begin, end,
            std::ostream_iterator<decltype(*begin)>(std::cout, " "));
  std::cout << '\n';
}
 
template <typename It>
void ShowArrayInfoAboutAdjastedZeros(It begin, It end) {
  ShowArray(begin, end);
  std::cout << "Has two adjasted zeros: " << std::boolalpha
            << HasTwoAdjastedZeros(begin, end) << '\n';
}
 
void ShowTestForArrayThatHasTwoAdjastedZeros() {
  const size_t size_of_array = 7;
  std::unique_ptr<int[]> array_that_has_two_zeros_adjasted(
      new int[size_of_array]{5, 1, 7, 0, 0, 4, 8});
  auto array_begin_ptr = array_that_has_two_zeros_adjasted.get();
  auto array_end_ptr = array_begin_ptr + size_of_array;
  ShowArrayInfoAboutAdjastedZeros(array_begin_ptr, array_end_ptr);
}
 
int main() { ShowTestForArrayThatHasTwoAdjastedZeros(); }