T = gets.to_i

T.times do
  n, m = gets.split.map(&:to_i)
  a = gets.split.map(&:to_i)
  b = Array.new(n + 1, 0)
  b[0] = m
  a.unshift(m)
  ok = true

  0.upto(n - 1) do |i|
    if b[i] > 0
      d = a[i + 1] - b[i + 1]
      b[i] -= d
      b[i + 1] += d
    end

    if a[i + 1] != b[i + 1] || b[i] < 0
      ok = false
    end

    if i + 2 <= n && b[i] > 0
      b[i + 2] += b[i]
      b[i] = 0
      ok = false if b[i + 2] > a[i + 2]
    end

    # pp b
  end

  if ok
    puts "Yes"
  else
    puts "No"
  end
end