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
    while(line = await readline()){
        let n = parseInt(line);
        let str_num = await readline();
        let arr_num = str_num.split(' ');
        let positive_count = 0, negative_count = 0; // 正数的个数和负数的个数
        let positive_sum = 0;
        for(let i=0; i<arr_num.length; i++){
            let tmp = parseInt(arr_num[i]);
            if(tmp>0){
                positive_count++;
                positive_sum+=tmp
            }else if(tmp<0){
                negative_count++;
            }
        }
        let res = '';
        if(positive_count==0){
            res = '0.0';  // 注意这里是0.0
        }else{
            res = parseFloat(positive_sum/positive_count).toFixed(1)
        }
        console.log(negative_count+' '+res);
    }
}()