计算两个列表ls和1t对应元素乘积的和(即向量积)，补充PY202.py。
ls=[111,222,333,444 ,555,666,777,888,999]
lt=[999,777,555,333,111,888,666,444,222]
参考答案
ls = [111, 222, 333, 444, 555, 666, 777, 888, 999] lt = [999, 777, 555, 333, 111, 888, 666, 444, 222] s = 0 for i in range(len(ls)): s += ls[i] * lt[i] print(s)
