题解 | #记负均正#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    // Write your code here
    let lines = [];
    while ((line = await readline())) {
        lines.push(line);
        if (lines.length == 2) {
            let number = lines[0];
            let s = lines[1];
            var arr = s.split(" ");
            var count = 0;
            var zhengshu = [];
            arr.forEach((num) => {
                if (num < 0) {
                    count++;
                }
                if (num > 0) {
                    zhengshu.push(num);
                }
            });
            var sum = 0;
            zhengshu.forEach((item) => {
                sum += Number(item);
            });
            var res = [];
            res.push(count);
            if (sum == 0) {
                res.push("0.0");
            } else {
                res.push((sum / zhengshu.length).toFixed(1));
            }
            console.log(res.join(" "));
        }
    }
})();