Dynamic memory allocation in C++ class

I am sure there is an alternative solution for this problem but I would really like to understand why my solution is not working

int n;
class Segtree
{

   public:
    int *s, size, h, *cl, *t; string a;
    int open, close, total;

    void init(string input,int siz)
    {
       size = siz;
       n = size;
       t = new int[size * 4];
       cl = new int[size * 4];
       s = new int[size * 4];
       a = input;
       build();
    };
}

I am dynamically allocating memory to arrays inside a class but I am getting some errors with memory allocation you can find it in the results here.
After this I allocated the memory statically. Inside the class but everytime I allocate around 10^6 size in all 3 arrays I get segfault. Note that this segfault will not occur had the array been global. What would be a good way to allocate around 10^7 size to int arrays inside a class ?

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