题解 | #记负均正#

const line1 = readline();
const line2 = readline();

function func(line1, line2) {
    let rtnVal;
    const len = parseInt(line1);
    const arr = line2.split(' ').map((item) => {
        return parseInt(item);
    });
    let num = 0;
    let znum = 0;
    let sum = 0;
    for (let i = 0; i < len; i++) {
        if (arr[i] > 0) {
            sum = sum + arr[i];
            num++;
        } else if(arr[i] === 0) {
            znum++;
        }
    }
    
    let ave = '0.0';
    if (num) {
        ave = (sum / num).toFixed(1);
    }
    
    rtnVal = (len - num - znum) + ' ' + ave;
    return rtnVal;
}

print(func(line1, line2));