[ferget]

так вроде

Код:

#include <iostream>
using namespace std;

int main()
{
	double* A;
	double* B;
	double* C;
	int B_cnt=0, C_cnt=0;
	int N;

	cout << "Enter size of array: ";
	cin  >> N;

	A = new double[N];
	B = new double[N];
	C = new double[N];

	cout << "Input array elements\n";
	for(int i = 0; i < N; i++)
		cin >> A[i];

	for(int i = 0; i < N; i++)
	{
		if (A[i] < 0)
			B[B_cnt++] = A[i];
		else
			C[C_cnt++] = A[i];
	}

	cout << "\nArray B (" << B_cnt << ") ";
	cout << "\nArray C (" << C_cnt << ") ";
	
	cin.ignore().ignore();
	return 0;
}