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程式語言 - LeetCode - C++ - 537. Complex Number Multiplication

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題目：


解答：

class Solution {
public:
    string complexNumberMultiply(string num1, string num2) {
        auto parse = [](string s) {
            int plus = s.find('+');
            int real = stoi(s.substr(0, plus));
            int image = stoi(s.substr(plus + 1, s.size() - plus - 2));

            return pair<int, int>(real, image);
        };

        auto [a, b] = parse(num1);
        auto [c, d] = parse(num2);
        int real = a * c - b * d;
        int image = a * d + b * c;

        return to_string(real) + "+" + to_string(image) + "i";
    }
};