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 C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
int main(void){
  int i, n, m, a[100], sum, tmp, counter;
  
  if( scanf("%d %d",&n ,&m)==1 );
  for(i=0;i<n;i++) if( scanf("%d",&a[i])==1 );
  
  sum = 0;
  for(i=0;i<n;i++) sum += a[i];
  
  tmp = sum / ( 4 * m );
  
  counter = 0;
  for(i=0;i<n;i++)
    if(a[i] >= tmp)
      counter++;
  
  if(counter >= m)
    printf("Yes");
  else
    printf("No");
  
  return 0;
}