537. Complex Number Multiplication

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.

# @lc code=start
using LeetCode

function complex_number_multiply(num1::String, num2::String)
    Ct = Complex{Int}
    mult = parse(Ct, num1) * parse(Ct, num2)
    return "$(mult.re)+$(mult.im)i"
end
# @lc code=end

complex_number_multiply (generic function with 1 method)

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