def fizzbuzz(n):
    """Return FizzBuzz strings for integers 1 through n inclusive.

    For each integer i in 1..n:
      - "FizzBuzz" if i is divisible by both 3 and 5,
      - "Fizz" if divisible by 3,
      - "Buzz" if divisible by 5,
      - otherwise str(i).
    If n < 1, return an empty list.
    """
    result = []
    for i in range(1, n + 1):
        if i % 15 == 0:
            result.append("FizzBuzz")
        elif i % 3 == 0:
            result.append("Fizz")
        elif i % 5 == 0:
            result.append("Buzz")
        else:
            result.append(str(i))
    return result