def add(a, b): return [a[i] + b[i] for i in range(0, min(len(a), len(b)))] def sub(a, b): return [a[i] - b[i] for i in range(0, min(len(a), len(b)))] def mul(a, n): return [a[i] * n for i in range(0, len(a))] def div(a, n): return [a[i] / n for i in range(0, len(a))] def dot(a, b): s = 0 for i in range(0, min(len(a), len(b))): s += a[i] * b[i] return s