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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

// inputに入力データ全体が入る
function Main(input) {
  // 1行目がinput[0], 2行目がinput[1], …に入る
  var ans = "Yes";
  input = input.trim().split("\n");
  const [N, M] = input[0].split(" ").map((n) => parseInt(n));
  var a = input[1].split(" ").map((n) => parseInt(n));
  a.sort((a, b) => b - a);
  var top = a.slice(0, M);
  const lim = arrsum(a) / 4 / N;

  if (top[top.length - 1] < lim) {
    ans = "No";
  }

  function arrsum(arr) {
    return arr.reduce((c, a, i, self) => {
      return c + a;
    });
  }

  //出力
  console.log(ans);
}
//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
// Main(require("fs").readFileSync("./input.txt", "utf-8"));