题解 | 小红的购物车

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=Integer.parseInt(sc.nextLine());
        // System.out.println(n);
        BigInteger amount=BigInteger.ZERO;
        while(n-->0){
            String s=sc.nextLine();
            // System.out.println(s);
            String[] arr=s.split(" ");
            BigInteger a=new BigInteger(arr[0]);
            if(arr[1].equals("O")){
                amount=amount.add(a);
            }
        }
        System.out.println(amount);
    }
}