Given two strings representing two complex numbers.
You need to return a string representing their multiplication. Note i2 = -1 according to the definition.
Example 1:
Input: "1+1i", "1+1i" Output: "0+2i" Explanation: (1 + i) * (1 + i) = 1 + i2 + 2 * i = 2i, and you need convert it to the form of 0+2i.Example 2:
Input: "1+-1i", "1+-1i" Output: "0+-2i" Explanation: (1 - i) * (1 - i) = 1 + i2 - 2 * i = -2i, and you need convert it to the form of 0+-2i. code: class Solution(object): def complexNumberMultiply(self, a, b): """ :type a: str :type b: str :rtype: str """ a1=int(list(a.split("+"))[0]) a2=int(list(a.split("+"))[-1][:-1]) b1=int(list(b.split("+"))[0]) b2=int(list(b.split("+"))[-1][:-1]) c=a1*b1-a2*b2 d=b1*a2+a1*b2 return "%d+%di"%(c,d) 用map： a1, a2 = map(int, a[:-1].split('+')) b1, b2 = map(int, b[:-1].split('+')) return '%d+%di' % (a1 * b1 - a2 * b2, a1 * b2 + a2 * b1)