@CBBBrother I think his method is pretty safe, considering he's not copying the vector for each stack frame but instead only the reference to that vector.

@yidui From what I understand, the function isn't tail recursive because the recursive call isn't the last operation performed by the function (last operation being the allocation of the new object). I don't really see how one could write it as a tail recursive funcion really...

Maybe use tail recursion can avoide this problem.

Never use recursive method. It's unsafable with overflow memory stack.

Never use recursive method. It's unsafable with overflow memory stack.

Never use recursive method. It's unsafable with overflow memory stack.

Never use recursive method. It's unsafable with overflow memory stack.