题解 | #记负均正II#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.*;
import java.util.stream.IntStream;
import java.util.stream.Stream;

import static java.util.Arrays.*;
import static java.util.stream.Stream.*;


public class Main {
    public static void main(String[] args) throws IOException {

        testTh();
    }
    private static void testTh() throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String str;

        ArrayList<String>s = new ArrayList<>();
        while ((str = bf.readLine()) != null) {
            s.add(str);
            if (str.equals("\n"))break;
        }
        int[] temp = new int[s.size()];
        int i = 0;
        int count = 0;
        for (String s1 : s) {
            int parseInt = Integer.parseInt(s1);
            if (parseInt < 0) {
                count++;
            } else if (parseInt == 0) {
                continue;
            } else {
                temp[i] = parseInt;
                i++;
            }
        }
        int res = 0;
        int flag = 0;
        for (int j = 0; j < temp.length; j++) {
            if (temp[j] == 0)break;
            res = res + temp[j];
            flag++;
        }

        if (flag == 0) {
           System.out.println(count);
            System.out.println("0.0");
        } else {
            double avg = (double) res / flag;
            DecimalFormat dateFormat = new DecimalFormat("#0.0");
            System.out.println(count);
            System.out.println(dateFormat.format(avg));
        }

    }

}