Problem:
Score : 400 points

Problem Statement

Let {\rm comb}(n,r) be the number of ways to choose r objects from among n objects, disregarding order.
From n non-negative integers a_1, a_2, ..., a_n, select two numbers a_i > a_j so that {\rm comb}(a_i,a_j) is maximized.
If there are multiple pairs that maximize the value, any of them is accepted.

Constraints

2 \leq n \leq 10^5

0 \leq a_i \leq 10^9

a_1,a_2,...,a_n are pairwise distinct.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

n
a_1 a_2 ... a_n

Output

Print a_i and a_j that you selected, with a space in between.

Sample Input 1

5
6 9 4 2 11

Sample Output 1

11 6

\rm{comb}(a_i,a_j) for each possible selection is as follows:

\rm{comb}(4,2)=6

\rm{comb}(6,2)=15

\rm{comb}(6,4)=15

\rm{comb}(9,2)=36

\rm{comb}(9,4)=126

\rm{comb}(9,6)=84

\rm{comb}(11,2)=55

\rm{comb}(11,4)=330

\rm{comb}(11,6)=462

\rm{comb}(11,9)=55

Thus, we should print 11 and 6.

Sample Input 2

2
100 0

Sample Output 2

100 0

Solution in Ruby (2.3.3) (judge verdict: Runtime Error)

n = gets.chomp.to_i
a = gets.split.map(&:to_i)

a.sort!

def abs(a)
  a < 0 ? -a : a
end

def comb(num,k) 
  k % num == 0 ? 1 : comb(num-1,k-1) + comb(num-1,k); 
end

ans = []

(n-1).times do |x|
  maxv = a.last
  a.delete(a.last)
  min = -1 
  idx = 0
  cval = a[ a.size / 2]
  ans << [comb(maxv, cval), maxv, cval]
end

max = 0
max_comb = ''
ans.each do |v|
 if max < v[0]
   max = v[0]
   max_comb = "#{v[1]} #{v[2]}"
 end
end
puts max_comb