/*
 * @lc app=leetcode id=155 lang=java
 *
 * [155] Min Stack
 */

// @lc code=start
class MinStack {
    private PriorityQueue<Integer> pq;
    private Deque<Integer> deque;

    public MinStack() {
        pq = new PriorityQueue<>();
        deque = new ArrayDeque<>();
    }
    
    public void push(int val) {
        pq.add(val);
        deque.addLast(val);
    }
    
    public void pop() {
        int v = deque.removeLast();
        pq.remove(v);
    }
    
    public int top() {
        return deque.peekLast();
    }
    
    public int getMin() {
        return pq.peek(); 
    }
}

/**
 * Your MinStack object will be instantiated and called as such:
 * MinStack obj = new MinStack();
 * obj.push(val);
 * obj.pop();
 * int param_3 = obj.top();
 * int param_4 = obj.getMin();
 */
// @lc code=end