// Runtime: 5 ms, faster than 100.00% of Java online submissions for Min Stack.
// Memory Usage: 38.6 MB, less than 44.93% of Java online submissions for Min Stack.
class MinStack {
    Deque<Integer> stack;
    Deque<Integer> mins;

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

    public void push(int x) {
        stack.push(x);
        if (mins.isEmpty() || x <= mins.peek()) mins.push(x);
    }

    public void pop() {
        if (stack.peek().equals(mins.peek())) mins.pop();
        stack.pop();
    }

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

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