题解 | #记票统计#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
// 这道题主要考map，要熟悉map的特性和api：get、set，
// 能够保存插入顺序
void async function () {
    // Write your code here
    let invalidNum=0;
    const countByName=new Map();
    while(num = await readline()){
        num=parseInt(num);
        let nameArr=await readline();
        nameArr=nameArr.split(" ");
        for(let item of nameArr){
            countByName.set(item,0);
        }
        let voteNum=await readline();
        let voteArr=await readline();
        voteArr=voteArr.split(" ");
        for(let item of voteArr){
            let curValue=countByName.get(item);
            if(curValue!==undefined){
                countByName.set(item,curValue+1);
            }else{
                invalidNum++;
            }
        }
    }
    for(let [key,value] of countByName){
        console.log(`${key} : ${value}`);
    }
    console.log(`Invalid : ${invalidNum}`);
}()