题解 | #记票统计#

const readline=require('readline')
const rl=readline.createInterface({
    input:process.stdin,
    output:process.stdout
})
let arr=[]
rl.on('line',(line)=>{
    arr.push(line)
})
rl.on('close',()=>{
    let res=[]
    let Invalid=0
    let obj = Object.create(null)
    //console.log(arr) [ '4', 'A B C D', '8', 'A D E CF A GG A B' ]
    arr1=arr[1].split(' ')
    arr3=arr[3].split(' ')
    //console.log(arr1) [ 'A', 'B', 'C', 'D' ]
    for(let i=0;i<arr3.length;i++){
        if(arr[1].split(' ').includes(arr3[i])){
            res.push(arr3[i])
        }else{
            Invalid++
        }
    }
    //console.log(res) [ 'A', 'D', 'A', 'A', 'B' ]
    //console.log(Invalid) 3
    const map=new Map()  //map以键值对形式存储
    for(let i=0;i<arr1.length;i++){
        let count=0
        map.set(arr1[i],0) //需要初始化map，否则C：0无法输出
        for(let j=0;j<res.length;j++){
            if(arr1[i]==res[j]){
                map.set(arr1[i],count=count+1)
            }
    }
    }
    for(const [k,v] of map){
        console.log(k+' : '+v)
    }
    // console.log(map) Map(4) { 'A' => 3, 'B' => 1, 'C' => 0, 'D' => 1 }
    console.log('Invalid : '+Invalid)
})