有一种栈，这种栈是按数组索引减小的方向增长的

在这个栈模型中，索引top在每次push索引操作后减小，而在pop操作后则增大。用此模型实现stack类模板-There is a stack, this stack is reduced by the array index in the stack direction of the growth model, the index top index in each push operation is reduced, and after the pop operation is increased. Achieved with this model stack class template