code: def next_power_of_2(n):
      
      n -= 1  # greater than OR EQUAL TO n
      shift = 1
      while (n + 1) & n:  # n+1 is not a power of 2 yet
          n |= n >> shift
          shift *= 2
      return max(4, n + 1)
docs: Return next power of 2 greater than or equal to n