Score : 200 points
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
.
Input is given from Standard Input in the following format:
N M A_1 ... A_N
If M popular items can be selected, print Yes
; otherwise, print No
.
4 1 5 4 2 1
Yes
There were 12 votes in total. The most popular item received 5 votes, and we can select it.
3 2 380 19 1
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.
12 3 4 56 78 901 2 345 67 890 123 45 6 789
Yes