题解 | #HJ097 记负均正#

import java.util.Scanner;

/**
 * HJ97 记负均正
 */
public class HJ097 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextInt()) {
            int n = sc.nextInt();
            int negCount = 0;//负数个数
            int pos = 0;//正数之和
            int posCount = 0;//正数个数
            for (int i = 0; i < n; i++) {
                int num = sc.nextInt();
                if (num < 0) {
                    negCount++;
                }
                if (num > 0) {
                    pos += num;
                    posCount++;
                }
            }
            if (posCount == 0) {
                System.out.printf("%d 0.0\n", negCount);
            } else {
                System.out.printf("%d %.1f\n", negCount, (double) pos / posCount);
            }
        }
        sc.close();
    }
}