package test_01;

import java.util.Stack;

public class test_03_25_02
{
    //棒球赛

    public static void main(String[] args) {
        String[] ops={"5","2","C","D","+"};
        System.out.println(calPoints(ops));

    }
    public static int calPoints(String[] ops)
    {
        Stack<Integer> s=new Stack<>();
        for(String op:ops)
        {
            switch (op)
            {
                case "+" ->
                        {
                            int a=s.pop();
                            int b=s.peek();
                            s.push(a);
                            s.push(a+b);
                        }
                case "D" ->s.push(2*s.peek());
                case "C" ->s.pop();
                default ->s.push(Integer.parseInt(op))

            }
        }
        int sum=0;
        for(Integer integer:s)
        {
            sum+=integer;
        }
        return sum;
    }






    //if语句
    /*public  int calPoints(String[] ops)
    {
        Stack<Integer>s=new Stack<>();
        for(String op:ops)
        {
            if(op.equals("+"))
            {
                int a=s.pop();
                int b=s.peek();
                s.push(a);
                s.push(a+b);
            }
            else if(ops.equals("D"))
            {
                s.push(2*s.peek());
            }
            else if(op.equals("C"))
            {
                s.pop();
            }
            else
            {
                s.push(Integer.parseInt(op));
            }

        }
        int sum=0;
        for(int i=0;i<s.size();i++)
        {
            sum+=s.get(i);
        }
        return sum;

    }*/

}