Min Stack

#

class MinStack {
    Stack<Integer> stack=new Stack<>();
    int min=Integer.MAX_VALUE;
    public MinStack() {
        
        
    }
    
    public void push(int x) {
        
        if(x <= min)
        {
            stack.push(min);
            min=x;
        }
        stack.push(x);
    }
    
    public void pop() {
        int peek=stack.pop();
        if(peek==min)
            min=stack.pop();
        
    }
    
    public int top() {
        // if(!stack.isEmpty())
            return stack.peek();
        // return 0;
    }
    
    public int getMin() {
        return min;
        
    }
}

/**
 * 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();
 */