(URI) Experiências - Solução

import java.io.*;
import java.util.*;

class Main  {
    public static void process() throws NumberFormatException, IOException {   
        Scanner sc = new Scanner(System.in);
       
        String animals = "CRS";
        int[] results = new int[4];
       
        int numTests = sc.nextInt();
        for (int i = 0; i < numTests; i++) {
            int qty = sc.nextInt();
            String op = sc.next();
           
            results[animals.indexOf(op)] += qty;           
            results[3] += qty;
        }
       
        System.out.println("Total: " + results[3] + " cobaias");
        System.out.println("Total de coelhos: " + results[0]);
        System.out.println("Total de ratos: " + results[1]);
        System.out.println("Total de sapos: " + results[2]);
        System.out.println("Percentual de coelhos: " + String.format("%.2f", (double)results[0]/results[3]*100) + " %");
        System.out.println("Percentual de ratos: " + String.format("%.2f", (double)results[1]/results[3]*100) + " %");
        System.out.println("Percentual de sapos: " + String.format("%.2f", (double)results[2]/results[3]*100) + " %");
                       
        return;
    }
   
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main m = new Main();
        m.process();

        System.exit(0);
    }
}