Java 代码

import java.util.Scanner;
import java.util.HashMap;

public class Main
{
    static final String CONEYS = "coneys";
    static final String RATS = "rats";
    static final String FROGS = "frogs";

    private static void add(HashMap map, String key, int value)
    {
        int x = (Integer)map.get(key);
        map.put(key, value + x);
    }

    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        int n = cin.nextInt();

        HashMap anm = new HashMap();

        anm.put(CONEYS, 0);
        anm.put(RATS, 0);
        anm.put(FROGS, 0);

        for (int i = 0; i < n; i ++)
        {
            int x = cin.nextInt();
            char m = cin.next().charAt(0);

            if ( m == 'C' )
                add (anm, CONEYS, x);
            else if (m == 'R')
                add (anm, RATS, x);
            else if (m == 'F')
                add (anm, FROGS, x);
        }

        n = (Integer)anm.get(CONEYS) + (Integer)anm.get(RATS) + (Integer)anm.get(FROGS);

        System.out.println("Total: " + n + " animals");
        System.out.println("Total " + CONEYS + ": " +  anm.get(CONEYS));
        System.out.println("Total " + RATS + ": " +  anm.get(RATS));
        System.out.println("Total " + FROGS + ": " +  anm.get(FROGS));
        System.out.println("Percentage of " + CONEYS + ": " + String.format("%.2f", 100.0*(Integer)anm.get(CONEYS)/n) + " %");
        System.out.println("Percentage of " + RATS + ": " + String.format("%.2f", 100.0*(Integer)anm.get(RATS)/n) + " %" );
        System.out.println("Percentage of " + FROGS + ": " + String.format("%.2f", 100.0*(Integer)anm.get(FROGS)/n) + " %" );
    }
}