Submission #2865203

---

Source Code Expand

N = gets.to_i
as = N.times.map{gets.to_i}
ones = {}
as.each do |a|
    num = 0
    num += 1 while a % (2<<num) == 0
    ones[a] = num
end
as.sort_by!{|a| -ones[a]}
pt = 0
L = as.max.bit_length
ans = 0
(L-1).downto(0) do |i|
    bit = 0
    as.each do |a|
        bit ^= a[i]
    end
    if bit == 1
        while pt < N && ones[as[pt]] > i
            pt += 1
        end
        if pt < N && ones[as[pt]] == i
            as[pt] -= 1
            pt += 1
            ans += 1
        else
            puts -1
            exit
        end
    end
end
puts ans

Submission Info

Compile Error

./Main.rb:27: warning: ambiguous first argument; put parentheses or a space even after `-' operator

Judge Result