【LeetCode】537. Complex Number Multiplication【M】

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.

Note:

1. The input strings will not have extra blank.
2. The input strings will be given in the form of a+bi, where the integer a and b will both belong to the range of [-100, 100]. And the output should be also in this form.

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這道題簡單得沒啥可說的啊

class Solution(object):
    def complexNumberMultiply(self, a, b):
        def get_num(s):
            s = s.split('+')
            s1 = int(s[0])
            s2 = int(s[1][:-1])
            return s1,s2


        a1,a2 = get_num(a)
        b1,b2 = get_num(b)

        res1 = a1*b1 - a2*b2
        res2 = a1*b2 + a2*b1

        return str(res1) + '+' + str(res2) + 'i'



        """
        :type a: str
        :type b: str
        :rtype: str
        """