массивы 5 - 9

#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;
int main()
{
    setlocale(LC_ALL, "Russian");
    int n, s, x, k = 0;
    cout << "Размер массива =";
    cin >> n;
	int m =2*n;
    int *mas = new int[m];
    for (int i = 0; i < n; ++i)
    {
        cout << "mas[" << i + 1<< "]=";
        cin >> mas[i];
    }
    cout << "Вставка =";
    cin >> s;
    cout << "Конец числа =";
    cin >> x;
    for (int i = 0; i < n; ++i)
    {
        if ((mas[i] % 10) == x)
        {
            for (int j = n; j > i; j--)
                mas[j] = mas[j - 1];
			n++;
            mas[i + 1] = s;
        }
    }
    for (int i = 0; i < n; ++i)
        cout << mas[i] << "\t";
    system("pause");
    return 0;
}