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 () {
    const n = parseInt(await readline());
    const nums = (await readline()).split(" ").map(Number);
    const positive = nums.filter(item => item > 0);
    const negative = nums.filter(item => item < 0);
    console.log(negative.length,positive.length?(positive.reduce((pre,cur)=>pre+cur,0)/positive.length).toFixed(1):0 .toFixed(1));
}()