题解 | #记负均正#

class HelloWorld {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int sum = 0,t = 0,count = 0,c0=0;
        for (int i = 0; i < n; i++) {
            t = in.nextInt();
            if (t < 0) {
                count++;
            } else if (t == 0) {
                c0++;
            } else {
                sum += t;
            }
        }
        if (count == n) {
            System.out.println(n + " " + 0);
        } else {
            
            int d = n-count-c0;
            //四舍五入 string.format  %n.f  
            System.out.println(count+" "+((d==0)?"0.0"+:String.format("%.1f",(float)sum/d)));
        } 
    }
}