every blog every motto: You will never know unless you try
0. 前言
生活好难，再坚持坚持！
1. 字符串
1.1 题目
1.2
class Solution:
def complexNumberMultiply(self, num1: str, num2: str) -> str:
s1, v1 = num1.split('+')
s2, v2 = num2.split('+')
# print(s1, type(s1))
# 实部
s = int(s1) * int(s2) - int(v1[:-1]) * int(v2[:-1])
# 虚部
v = int(s1) * int(v2[:-1]) + int(s2) * int(v1[:-1])
v = str(v) + 'i'
sv = str(s) + '+' + v
return sv
1.3
