Problem:
Score : 500 points

Problem Statement

We have N integers. The i-th number is A_i.

\{A_i\} is said to be pairwise coprime when GCD(A_i,A_j)=1 holds for every pair (i, j) such that 1\leq i < j \leq N.

\{A_i\} is said to be setwise coprime when \{A_i\} is not pairwise coprime but GCD(A_1,\ldots,A_N)=1.

Determine if \{A_i\} is pairwise coprime, setwise coprime, or neither.

Here, GCD(\ldots) denotes greatest common divisor.

Constraints

2 \leq N \leq 10^6

1 \leq A_i\leq 10^6

Input

Input is given from Standard Input in the following format:

N
A_1 \ldots A_N

Output

If \{A_i\} is pairwise coprime, print pairwise coprime; if \{A_i\} is setwise coprime, print setwise coprime; if neither, print not coprime.

Sample Input 1

3
3 4 5

Sample Output 1

pairwise coprime

GCD(3,4)=GCD(3,5)=GCD(4,5)=1, so they are pairwise coprime.

Sample Input 2

3
6 10 15

Sample Output 2

setwise coprime

Since GCD(6,10)=2, they are not pairwise coprime. However, since GCD(6,10,15)=1, they are setwise coprime.

Sample Input 3

3
6 10 16

Sample Output 3

not coprime

GCD(6,10,16)=2, so they are neither pairwise coprime nor setwise coprime.

Solution in Ruby (2.7.1) (judge verdict: Wrong Answer)

class PrimeDivWithSieve
  def initialize(n)
    @sieve = [] # nまでの素数を入れる
    @min_div = {} # keyの値の最小の素因数を入れる
    @elm = {}
    # 他を篩落とし得る素数はsqrtを上限にできる
    (2..Math.sqrt(n).floor).each do |i|
      next if @min_div[i] # ここに値が入ってる = ふるい落とされている
      @sieve << i # ふるい落とされずに来たらそいつは素数

      sieve_target = i * i
      while sieve_target <= n do
        @min_div[sieve_target] ||= i
        sieve_target += i
      end
    end
    (Math.sqrt(n).floor.next..n).each do |i|
      next if @min_div[i]
      @sieve << i
    end
  end

  # Integer#prime_division と同じ値を返すようにする
  # https://docs.ruby-lang.org/ja/latest/method/Integer/i/prime_division.html
  def prime_division(num)
    return [[num, 1]] if !@min_div[num] # 素数のときすぐ返す

    return_array = [] # [[a, x], [b, y]] <=> num = a^x * b^y
    while num > 1 do
      prime = @min_div[num] # 最小の素因数, nil => numが素数
      break return_array.push([num, 1]) if !prime

      div_total = 0
      while num % prime == 0 do
        num /= prime
        div_total += 1
      end
      return_array.push([prime, div_total])
    end

    return_array
  end

  def prime_list
    @sieve
  end

  def elms(num)
    @elm[num] ||= prime_division(num).map(&:first)
  end
end

_n = gets.chomp.split.map(&:to_i)
arr = gets.chomp.split.map(&:to_i)

divisor = PrimeDivWithSieve.new(1_000_000)


common_elms = divisor.elms(arr[0])
all_elms = {}
common_elms.each do |i|
  all_elms[i] = true
end

pair = true
set = true
arr[1..-1].each do |i|
  crr_elms = divisor.elms(i)
  common_elms = common_elms & crr_elms if set # どちらにもある要素が共通因数
  if pair
    crr_elms.each do |i|
      break pair = false if all_elms[i]
      all_elms[i] = true
    end
  elsif set
    set = false if common_elms.empty?
  end
end

if pair
  puts "pairwise coprime"
elsif set
  puts "setwise coprime"
else
  puts "not coprime"
end