// Runtime: 47 ms, faster than 72.11% of Java online submissions for Min Stack.
// Memory Usage: 39.7 MB, less than 39.13% of Java online submissions for Min Stack.
class MinStack {
    PriorityQueue<Integer> pq;
    Deque<Integer> stack;

    /** initialize your data structure here. */
    public MinStack() {
        stack = new LinkedList<Integer>();
        pq = new PriorityQueue<Integer>();
    }

    public void push(int x) {
        stack.addFirst(x);
        pq.add(x);
    }

    public void pop() {
        int top = stack.removeFirst();
        pq.remove(top);
    }

    public int top() {
        return stack.getFirst();
    }

    public int getMin() {
        return pq.peek();
    }
}