Problem:
Score : 200 points

Problem Statement

We have held a popularity poll for N items on sale. Item i received A_i votes.

From these N items, we will select M as popular items. However, we cannot select an item with less than \dfrac{1}{4M} of the total number of votes.

If M popular items can be selected, print Yes; otherwise, print No.

Constraints

1 \leq M \leq N \leq 100

1 \leq A_i \leq 1000

A_i are distinct.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M
A_1 ... A_N

Output

If M popular items can be selected, print Yes; otherwise, print No.

Sample Input 1

4 1
5 4 2 1

Sample Output 1

Yes

There were 12 votes in total. The most popular item received 5 votes, and we can select it.

Sample Input 2

3 2
380 19 1

Sample Output 2

No

There were 400 votes in total. The second and third most popular items received less than \dfrac{1}{4\times 2} of the total number of votes, so we cannot select them. Thus, we cannot select two popular items.

Sample Input 3

12 3
4 56 78 901 2 345 67 890 123 45 6 789

Sample Output 3

Yes

Solution in Kotlin (1.3.71) (judge verdict: Accepted)

import kotlin.math.ceil

fun main (args:Array<String>) {
    var (itemNum , popItem) = readLine()!!.split(" ").map(String::toInt)
    var vote = readLine()!!.split(" ").map(String::toInt).toMutableList()
    var numVote = 0

    vote.forEach{                         //総得票数を求めるため
        numVote += it
    }
    val aaa = ceil(numVote.toDouble()/(4*popItem))   //人気商品を選ぶ基準の数字を決定,voteの中にaaa以上のものがpopItem以上あればYes,popItem未満であればNo
    var bbb = 0
    vote.sortDescending()
//    print(vote[0]..vote[popItem-1])

    vote.forEach {
        if (it >= aaa) bbb += 1
    }

    if(bbb >= popItem){
        print("Yes")
        return
    }
    print("No")



//    print(numVote)
//    print(numVote/(4*b))
//    for (i in vote) {
//        if (numVote / (4 * popItem) < i) {      //人気商品を選ぶための基準
//            print(i)
////            popItem - 1
////            if (popItem <= 0) break
//        }
//        else {
//            print("No")
//        }
//    }
}