Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.
- push(x) -- Push element x onto stack.
- pop() -- Removes the element on top of the stack.
- top() -- Get the top element.
- getMin() -- Retrieve the minimum element in the stack.
const Stack_3 = new MinStack()
Stack_3.push(1)
Stack_3.push(2)
Stack_3.push(1)
Stack_3.push(-1)
Stack_3.push(0)
Stack_3.pop()
Stack_3.getMin()
// output -1