题解 | #记负均正II#

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int negativeNums = 0;
        int nonnegativeNums = 0;
        double nonnegativeTotal = 0.0;
        while (scan.hasNext()) {
            int val = Integer.valueOf(scan.nextLine().trim());
            if (val < 0) {
                negativeNums++;
            } else {
                nonnegativeNums++;
                nonnegativeTotal += val;
            }
        }
        System.out.println(negativeNums);
        if (nonnegativeNums == 0) {
            System.out.printf("%.1f", 0.0);
        } else {
            System.out.printf("%.1f", nonnegativeTotal / nonnegativeNums);
        }
    }
}