43.字符串相乘
任务描述
-
思路 - 将字符串转为整数型列表，算出乘积后再用str()转为字符串输出
代码实现
class Solution:
def multiply(self, num1: str, num2: str) -> str:
l1 = [int(x) for x in num1]
l2 = [int(x) for x in num2]
a = len(l1)
b = len(l2)
sum1 = 0
sum2 = 0
for i in range(a):
sum1 += l1[i]*10**(a-1-i)
for i in range(b):
sum2 += l2[i]*10**(b-1-i)
return str(sum1*sum2)